canSAS - User contributions [en]

SESANS Reproducibility Working Group

2025-03-12T14:24:20Z

Gnsmith: /* News and Status */

The spin-echo SANS (SESANS) working group is a subgroup of the [[Reproducibility_and_Reliability_Working_Group | canSAS Reproducibility and Reliability Working Group]].

== Mission ==
Spin-echo small-angle neutron scattering (SESANS) is a variant of small-angle neutron scattering that uses the Larmor precession of polarised neutrons to study the structure of materials in real space and up to length scales of some ten micrometer.

The mission of this group is to achieve SESANS measurements that provide data on an absolute scale independent from the used instrument. They do this by discussing the development of standard calibration samples and considering issues of reproducibility between different instruments, ensuring that data are trustworthy, reliable, and comparable.

== Members ==
* Wim Bouwman (TU Delft)
* Robert Dalgliesh (ISIS Neutron and Muon Source)
* Henrich Frielinghaus (Jülich Centre for Neutron Science, MLZ)
* Fankang Li (Oak Ridge National Laboratory)
* Andrew Parnell (The University of Sheffield)
* Steven Parnell (ISIS Neutron and Muon Source)
* Roger Pynn (Indiana University Bloomington)
* Gregory Smith (Chair, ISIS Neutron and Muon Source)

== News and Status ==

* 3 November 2024: Update about group to canSAS members at [[canSAS-XIV | canSAS-XIV]] in Taipei, Taiwan. [https://wiki.cansas.org/images/2/26/SESANS_canSAS_2024.pdf | Presentation]
* 25 January 2024: Discussion of current and future SESANS data formats.
* 18 October 2023: Update about group to canSAS members at [[canSAS-2023 | canSAS-XIII]] in Grenoble, France. [https://wiki.cansas.org/images/0/08/GNS_canSAS2023_SESANS.pdf Presentation]
* 16 June 2023: Discussion of recent reproducibility measurements and possible future events. [https://wiki.cansas.org/images/e/ef/Minutes_of_Meeting_-_2023-06-16.pdf Minutes]
* 20 January 2023: Discussion of recent test measurements and data analysis. [https://wiki.cansas.org/images/c/cb/Minutes_of_Meeting_-_2023-01-20.pdf Minutes]
* 13 September 2022: Working group introduced to canSAS members at [[canSAS-XII | canSAS-XII]] in Campinas, Brazil. [https://wiki.cansas.org/images/8/89/202209_SESANS-WG_canSAS-2.pdf Presentation]
* 30 November 2021: Discussion of recent measurements of possible standard samples and plans for next test measurements. [https://wiki.cansas.org/images/0/0d/Minutes_of_WG_Meeting_-_2021-11-30.pdf Minutes]
* 22 March 2021: Inaugural meeting of the group. [https://wiki.cansas.org/images/4/45/Minutes_of_Initial_Meeting_-_2021-03-22.pdf Minutes]

== SESANS Nomenclature ==
As a group, we recommend the following nomenclature for SESANS measurements to ensure consistency between instruments and the literature.

SESANS data are measured as a function of a parameter called the "spin-echo length". This is represented by the variable δ. We do not recommend a preferred unit, and the choice of unit (μm, nm, or Å) should be chosen to suit the natural length scale of the measurement.

SESANS data itself are referred to as the "normalized scattering correlation function". This is a normalization of the experimentally measured parameters, the polarization of the sample (P) and the polarization of the reference (P0). These are combined to give the recommended presentation of SESANS data, the natural logarithm of P/P0 divided by sample thickness (t) and the square of the neutron wavelength (λ2), for brevity ln(P/P0)/(t*λ2). These are the two current recommended normalizations, and dividing by them should give instrument and wavelength independent data. There is no recommended variable for the normalized scattering correlation function. We recommend using the unit (cm-1 Å-2) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).

== Data Repository ==
Data from possible standards can be shared on the working group's [https://zenodo.org/communities/sesans_reproducibility_working_group/ Zenodo community].

Data will be reviewed to ensure that they comply with current file standards (*.ses) before acceptance.

== Data Reproducibility Round Robin ==
Samples of a nanoporous alumina membrane and a flexible graphite sheet were measured by the SESANS instruments at ISIS (Larmor), TU Delft, and Oak Ridge National Lab. The results were published in 2025 in ''Neutron News''. [https://doi.org/10.1080/10448632.2025.2468088 doi:10.1080/10448632.2025.2468088] [https://wiki.cansas.org/images/a/a4/Data_Reproducibility_of_Spin-Echo_Small-Angle_Neutron_Scattering_Instruments.pdf PDF]

== SESANS Instruments ==
* Larmor instrument at ISIS Neutron and Muon Source (UK) [https://www.isis.stfc.ac.uk/Pages/Larmor.aspx ISIS Larmor]
* SESANS instrument at Reactor Institute Delft, TU Delft (The Netherlands) [https://www.tudelft.nl/en/faculty-of-applied-sciences/business/facilities/reactor-institute-delft/research-instruments/sesans Research instruments SESANS]
* SESANS at Oak Ridge National Lab (USA) [https://fankangli.ornl.gov/sesans/ SESANS 1-D Ultra Low Q Small Angle Neutron Scattering]

== Mailing List ==
The Working Group maintains a mailing list to provide updates on activities and relevant data. You can subscribe to this at the [https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=SESANS-WORKING-GROUP&A=1 JiscMail mailing list sign up form].

[[Category:Working Groups]]

SESANS Reproducibility Working Group

2025-03-12T14:14:24Z

Gnsmith: added data reproducibility round robin section

The spin-echo SANS (SESANS) working group is a subgroup of the [[Reproducibility_and_Reliability_Working_Group | canSAS Reproducibility and Reliability Working Group]].

== Mission ==
Spin-echo small-angle neutron scattering (SESANS) is a variant of small-angle neutron scattering that uses the Larmor precession of polarised neutrons to study the structure of materials in real space and up to length scales of some ten micrometer.

The mission of this group is to achieve SESANS measurements that provide data on an absolute scale independent from the used instrument. They do this by discussing the development of standard calibration samples and considering issues of reproducibility between different instruments, ensuring that data are trustworthy, reliable, and comparable.

== Members ==
* Wim Bouwman (TU Delft)
* Robert Dalgliesh (ISIS Neutron and Muon Source)
* Henrich Frielinghaus (Jülich Centre for Neutron Science, MLZ)
* Fankang Li (Oak Ridge National Laboratory)
* Andrew Parnell (The University of Sheffield)
* Steven Parnell (ISIS Neutron and Muon Source)
* Roger Pynn (Indiana University Bloomington)
* Gregory Smith (Chair, ISIS Neutron and Muon Source)

== News and Status ==

* 3 November 2024: Update about group to canSAS members at [[canSAS-XIV | canSAS-XIV]] in Taipei, Taiwan. [https://wiki.cansas.org/images/2/26/SESANS_canSAS_2024.pdf | Presentation]
* 25 January 2024: Discussion of current and future SESANS data formats.
* 18 October 2023: Update about group to canSAS members at [[canSAS-2023 | canSAS-XII]] in Grenoble, France. [https://wiki.cansas.org/images/0/08/GNS_canSAS2023_SESANS.pdf Presentation]
* 16 June 2023: Discussion of recent reproducibility measurements and possible future events. [https://wiki.cansas.org/images/e/ef/Minutes_of_Meeting_-_2023-06-16.pdf Minutes]
* 20 January 2023: Discussion of recent test measurements and data analysis. [https://wiki.cansas.org/images/c/cb/Minutes_of_Meeting_-_2023-01-20.pdf Minutes]
* 13 September 2022: Working group introduced to canSAS members at [[canSAS-XII | canSAS-XII]] in Campinas, Brazil. [https://wiki.cansas.org/images/8/89/202209_SESANS-WG_canSAS-2.pdf Presentation]
* 30 November 2021: Discussion of recent measurements of possible standard samples and plans for next test measurements. [https://wiki.cansas.org/images/0/0d/Minutes_of_WG_Meeting_-_2021-11-30.pdf Minutes]
* 22 March 2021: Inaugural meeting of the group. [https://wiki.cansas.org/images/4/45/Minutes_of_Initial_Meeting_-_2021-03-22.pdf Minutes]

== SESANS Nomenclature ==
As a group, we recommend the following nomenclature for SESANS measurements to ensure consistency between instruments and the literature.

SESANS data are measured as a function of a parameter called the "spin-echo length". This is represented by the variable δ. We do not recommend a preferred unit, and the choice of unit (μm, nm, or Å) should be chosen to suit the natural length scale of the measurement.

SESANS data itself are referred to as the "normalized scattering correlation function". This is a normalization of the experimentally measured parameters, the polarization of the sample (P) and the polarization of the reference (P0). These are combined to give the recommended presentation of SESANS data, the natural logarithm of P/P0 divided by sample thickness (t) and the square of the neutron wavelength (λ2), for brevity ln(P/P0)/(t*λ2). These are the two current recommended normalizations, and dividing by them should give instrument and wavelength independent data. There is no recommended variable for the normalized scattering correlation function. We recommend using the unit (cm-1 Å-2) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).

== Data Repository ==
Data from possible standards can be shared on the working group's [https://zenodo.org/communities/sesans_reproducibility_working_group/ Zenodo community].

Data will be reviewed to ensure that they comply with current file standards (*.ses) before acceptance.

== Data Reproducibility Round Robin ==
Samples of a nanoporous alumina membrane and a flexible graphite sheet were measured by the SESANS instruments at ISIS (Larmor), TU Delft, and Oak Ridge National Lab. The results were published in 2025 in ''Neutron News''. [https://doi.org/10.1080/10448632.2025.2468088 doi:10.1080/10448632.2025.2468088] [https://wiki.cansas.org/images/a/a4/Data_Reproducibility_of_Spin-Echo_Small-Angle_Neutron_Scattering_Instruments.pdf PDF]

== SESANS Instruments ==
* Larmor instrument at ISIS Neutron and Muon Source (UK) [https://www.isis.stfc.ac.uk/Pages/Larmor.aspx ISIS Larmor]
* SESANS instrument at Reactor Institute Delft, TU Delft (The Netherlands) [https://www.tudelft.nl/en/faculty-of-applied-sciences/business/facilities/reactor-institute-delft/research-instruments/sesans Research instruments SESANS]
* SESANS at Oak Ridge National Lab (USA) [https://fankangli.ornl.gov/sesans/ SESANS 1-D Ultra Low Q Small Angle Neutron Scattering]

== Mailing List ==
The Working Group maintains a mailing list to provide updates on activities and relevant data. You can subscribe to this at the [https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=SESANS-WORKING-GROUP&A=1 JiscMail mailing list sign up form].

[[Category:Working Groups]]

File:Data Reproducibility of Spin-Echo Small-Angle Neutron Scattering Instruments.pdf

2025-03-12T14:13:00Z

Gnsmith: Title: "Data Reproducibility of Spin-Echo Small-Angle Neutron Scattering Instruments"; Journal: Neutron News; Year: 2025; doi:10.1080/10448632.2025.2468088

== Summary ==
Title: "Data Reproducibility of Spin-Echo Small-Angle Neutron Scattering Instruments"; Journal: Neutron News; Year: 2025; doi:10.1080/10448632.2025.2468088

SESANS Reproducibility Working Group

2025-03-12T13:59:02Z

Gnsmith: Removed canSAS SESANS WG discussion notes

The spin-echo SANS (SESANS) working group is a subgroup of the [[Reproducibility_and_Reliability_Working_Group | canSAS Reproducibility and Reliability Working Group]].

== Mission ==
Spin-echo small-angle neutron scattering (SESANS) is a variant of small-angle neutron scattering that uses the Larmor precession of polarised neutrons to study the structure of materials in real space and up to length scales of some ten micrometer.

The mission of this group is to achieve SESANS measurements that provide data on an absolute scale independent from the used instrument. They do this by discussing the development of standard calibration samples and considering issues of reproducibility between different instruments, ensuring that data are trustworthy, reliable, and comparable.

== Members ==
* Wim Bouwman (TU Delft)
* Robert Dalgliesh (ISIS Neutron and Muon Source)
* Henrich Frielinghaus (Jülich Centre for Neutron Science, MLZ)
* Fankang Li (Oak Ridge National Laboratory)
* Andrew Parnell (The University of Sheffield)
* Steven Parnell (ISIS Neutron and Muon Source)
* Roger Pynn (Indiana University Bloomington)
* Gregory Smith (Chair, ISIS Neutron and Muon Source)

== News and Status ==

* 3 November 2024: Update about group to canSAS members at [[canSAS-XIV | canSAS-XIV]] in Taipei, Taiwan. [https://wiki.cansas.org/images/2/26/SESANS_canSAS_2024.pdf | Presentation]
* 25 January 2024: Discussion of current and future SESANS data formats.
* 18 October 2023: Update about group to canSAS members at [[canSAS-2023 | canSAS-XII]] in Grenoble, France. [https://wiki.cansas.org/images/0/08/GNS_canSAS2023_SESANS.pdf Presentation]
* 16 June 2023: Discussion of recent reproducibility measurements and possible future events. [https://wiki.cansas.org/images/e/ef/Minutes_of_Meeting_-_2023-06-16.pdf Minutes]
* 20 January 2023: Discussion of recent test measurements and data analysis. [https://wiki.cansas.org/images/c/cb/Minutes_of_Meeting_-_2023-01-20.pdf Minutes]
* 13 September 2022: Working group introduced to canSAS members at [[canSAS-XII | canSAS-XII]] in Campinas, Brazil. [https://wiki.cansas.org/images/8/89/202209_SESANS-WG_canSAS-2.pdf Presentation]
* 30 November 2021: Discussion of recent measurements of possible standard samples and plans for next test measurements. [https://wiki.cansas.org/images/0/0d/Minutes_of_WG_Meeting_-_2021-11-30.pdf Minutes]
* 22 March 2021: Inaugural meeting of the group. [https://wiki.cansas.org/images/4/45/Minutes_of_Initial_Meeting_-_2021-03-22.pdf Minutes]

== SESANS Nomenclature ==
As a group, we recommend the following nomenclature for SESANS measurements to ensure consistency between instruments and the literature.

SESANS data are measured as a function of a parameter called the "spin-echo length". This is represented by the variable δ. We do not recommend a preferred unit, and the choice of unit (μm, nm, or Å) should be chosen to suit the natural length scale of the measurement.

SESANS data itself are referred to as the "normalized scattering correlation function". This is a normalization of the experimentally measured parameters, the polarization of the sample (P) and the polarization of the reference (P0). These are combined to give the recommended presentation of SESANS data, the natural logarithm of P/P0 divided by sample thickness (t) and the square of the neutron wavelength (λ2), for brevity ln(P/P0)/(t*λ2). These are the two current recommended normalizations, and dividing by them should give instrument and wavelength independent data. There is no recommended variable for the normalized scattering correlation function. We recommend using the unit (cm-1 Å-2) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).

== Data Repository ==
Data from possible standards can be shared on the working group's [https://zenodo.org/communities/sesans_reproducibility_working_group/ Zenodo community].

Data will be reviewed to ensure that they comply with current file standards (*.ses) before acceptance.

== SESANS Instruments ==
* Larmor instrument at ISIS Neutron and Muon Source (UK) [https://www.isis.stfc.ac.uk/Pages/Larmor.aspx ISIS Larmor]
* SESANS instrument at Reactor Institute Delft, TU Delft (The Netherlands) [https://www.tudelft.nl/en/faculty-of-applied-sciences/business/facilities/reactor-institute-delft/research-instruments/sesans Research instruments SESANS]
* SESANS at Oak Ridge National Lab (USA) [https://fankangli.ornl.gov/sesans/ SESANS 1-D Ultra Low Q Small Angle Neutron Scattering]

== Mailing List ==
The Working Group maintains a mailing list to provide updates on activities and relevant data. You can subscribe to this at the [https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=SESANS-WORKING-GROUP&A=1 JiscMail mailing list sign up form].

[[Category:Working Groups]]

Second WG Discussion

2025-03-12T13:58:40Z

Gnsmith: Moved SESANS notes from WG page

<big>'''Notes from canSAS 2024 Second Working Group Discussion Session'''</big> 
'''Includes:'''
* Data Formats
* TOF SANS
* SESANS
* Tomograph

__TOC__

= SESANS Session Notes SAS2024 - Sun 2024-11-03 =

=== Topic: Cross-calibration ===
* Following round-robin reference samples have been used so far for SESANS at several sources (according to Wim Bouwman): Flexi-Por, Papyex. These measurements have also been compared to SANS/USANS results from the same samples.
* But: these kinds of samples have the disadvantage that they show artifacts when used for TOF-SESANS.
* Also, the presented reference data had differences in peak-minima of measured reverence samples at different sources. The reason for this difference still has to be identified.
* General consens: We need more sets of standard samples at all facilities

=== Notes from the discussion round: ===

* What is needed: New standard samples with shorter length scales of around 50nm (but such gratings are difficult to make)
* The question was raised if new round robin samples should be fabricated which can be handed from facility to facility. On the other hand, a good reference sample depends on each use-case - there is no perfect standard sample for several techniques/facilities. Instead, good existing standard samples (like the above mentioned and already measured Flexi-Por/Papyex) should be used.

SESANS Reproducibility Working Group

2025-03-12T13:56:41Z

Gnsmith: /* News and Status */

The spin-echo SANS (SESANS) working group is a subgroup of the [[Reproducibility_and_Reliability_Working_Group | canSAS Reproducibility and Reliability Working Group]].

== Mission ==
Spin-echo small-angle neutron scattering (SESANS) is a variant of small-angle neutron scattering that uses the Larmor precession of polarised neutrons to study the structure of materials in real space and up to length scales of some ten micrometer.

The mission of this group is to achieve SESANS measurements that provide data on an absolute scale independent from the used instrument. They do this by discussing the development of standard calibration samples and considering issues of reproducibility between different instruments, ensuring that data are trustworthy, reliable, and comparable.

== Members ==
* Wim Bouwman (TU Delft)
* Robert Dalgliesh (ISIS Neutron and Muon Source)
* Henrich Frielinghaus (Jülich Centre for Neutron Science, MLZ)
* Fankang Li (Oak Ridge National Laboratory)
* Andrew Parnell (The University of Sheffield)
* Steven Parnell (ISIS Neutron and Muon Source)
* Roger Pynn (Indiana University Bloomington)
* Gregory Smith (Chair, ISIS Neutron and Muon Source)

== News and Status ==

* 3 November 2024: Update about group to canSAS members at [[canSAS-XIV | canSAS-XIV]] in Taipei, Taiwan. [https://wiki.cansas.org/images/2/26/SESANS_canSAS_2024.pdf | Presentation]
* 25 January 2024: Discussion of current and future SESANS data formats.
* 18 October 2023: Update about group to canSAS members at [[canSAS-2023 | canSAS-XII]] in Grenoble, France. [https://wiki.cansas.org/images/0/08/GNS_canSAS2023_SESANS.pdf Presentation]
* 16 June 2023: Discussion of recent reproducibility measurements and possible future events. [https://wiki.cansas.org/images/e/ef/Minutes_of_Meeting_-_2023-06-16.pdf Minutes]
* 20 January 2023: Discussion of recent test measurements and data analysis. [https://wiki.cansas.org/images/c/cb/Minutes_of_Meeting_-_2023-01-20.pdf Minutes]
* 13 September 2022: Working group introduced to canSAS members at [[canSAS-XII | canSAS-XII]] in Campinas, Brazil. [https://wiki.cansas.org/images/8/89/202209_SESANS-WG_canSAS-2.pdf Presentation]
* 30 November 2021: Discussion of recent measurements of possible standard samples and plans for next test measurements. [https://wiki.cansas.org/images/0/0d/Minutes_of_WG_Meeting_-_2021-11-30.pdf Minutes]
* 22 March 2021: Inaugural meeting of the group. [https://wiki.cansas.org/images/4/45/Minutes_of_Initial_Meeting_-_2021-03-22.pdf Minutes]

== SESANS Nomenclature ==
As a group, we recommend the following nomenclature for SESANS measurements to ensure consistency between instruments and the literature.

SESANS data are measured as a function of a parameter called the "spin-echo length". This is represented by the variable δ. We do not recommend a preferred unit, and the choice of unit (μm, nm, or Å) should be chosen to suit the natural length scale of the measurement.

SESANS data itself are referred to as the "normalized scattering correlation function". This is a normalization of the experimentally measured parameters, the polarization of the sample (P) and the polarization of the reference (P0). These are combined to give the recommended presentation of SESANS data, the natural logarithm of P/P0 divided by sample thickness (t) and the square of the neutron wavelength (λ2), for brevity ln(P/P0)/(t*λ2). These are the two current recommended normalizations, and dividing by them should give instrument and wavelength independent data. There is no recommended variable for the normalized scattering correlation function. We recommend using the unit (cm-1 Å-2) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).

== Data Repository ==
Data from possible standards can be shared on the working group's [https://zenodo.org/communities/sesans_reproducibility_working_group/ Zenodo community].

Data will be reviewed to ensure that they comply with current file standards (*.ses) before acceptance.

== SESANS Instruments ==
* Larmor instrument at ISIS Neutron and Muon Source (UK) [https://www.isis.stfc.ac.uk/Pages/Larmor.aspx ISIS Larmor]
* SESANS instrument at Reactor Institute Delft, TU Delft (The Netherlands) [https://www.tudelft.nl/en/faculty-of-applied-sciences/business/facilities/reactor-institute-delft/research-instruments/sesans Research instruments SESANS]
* SESANS at Oak Ridge National Lab (USA) [https://fankangli.ornl.gov/sesans/ SESANS 1-D Ultra Low Q Small Angle Neutron Scattering]

== Mailing List ==
The Working Group maintains a mailing list to provide updates on activities and relevant data. You can subscribe to this at the [https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=SESANS-WORKING-GROUP&A=1 JiscMail mailing list sign up form].

[[Category:Working Groups]]

= Session Notes SAS2024 - Sun 2024-11-03 =

=== Topic: Cross-calibration ===
* Following round-robin reference samples have been used so far for SESANS at several sources (according to Wim Bouwman): Flexi-Por, Papyex. These measurements have also been compared to SANS/USANS results from the same samples.
* But: these kinds of samples have the disadvantage that they show artifacts when used for TOF-SESANS.
* Also, the presented reference data had differences in peak-minima of measured reverence samples at different sources. The reason for this difference still has to be identified.
* General consens: We need more sets of standard samples at all facilities

=== Notes from the discussion round: ===

* What is needed: New standard samples with shorter length scales of around 50nm (but such gratings are difficult to make)
* The question was raised if new round robin samples should be fabricated which can be handed from facility to facility. On the other hand, a good reference sample depends on each use-case - there is no perfect standard sample for several techniques/facilities. Instead, good existing standard samples (like the above mentioned and already measured Flexi-Por/Papyex) should be used.

SESANS Reproducibility Working Group

2025-03-12T13:56:07Z

Gnsmith: /* News and Status */ added recent news and files

The spin-echo SANS (SESANS) working group is a subgroup of the [[Reproducibility_and_Reliability_Working_Group | canSAS Reproducibility and Reliability Working Group]].

== Mission ==
Spin-echo small-angle neutron scattering (SESANS) is a variant of small-angle neutron scattering that uses the Larmor precession of polarised neutrons to study the structure of materials in real space and up to length scales of some ten micrometer.

The mission of this group is to achieve SESANS measurements that provide data on an absolute scale independent from the used instrument. They do this by discussing the development of standard calibration samples and considering issues of reproducibility between different instruments, ensuring that data are trustworthy, reliable, and comparable.

== Members ==
* Wim Bouwman (TU Delft)
* Robert Dalgliesh (ISIS Neutron and Muon Source)
* Henrich Frielinghaus (Jülich Centre for Neutron Science, MLZ)
* Fankang Li (Oak Ridge National Laboratory)
* Andrew Parnell (The University of Sheffield)
* Steven Parnell (ISIS Neutron and Muon Source)
* Roger Pynn (Indiana University Bloomington)
* Gregory Smith (Chair, ISIS Neutron and Muon Source)

== News and Status ==

* 3 November 2024: Update about group to canSAS members at [[canSAS-XIV | canSAS-XIV]] in Taipei, Taiwan. [https://wiki.cansas.org/index.php?title=File:SESANS_canSAS_2024.pdf | Presentation]
* 25 January 2024: Discussion of current and future SESANS data formats.
* 18 October 2023: Update about group to canSAS members at [[canSAS-2023 | canSAS-XII]] in Grenoble, France. [https://wiki.cansas.org/images/0/08/GNS_canSAS2023_SESANS.pdf Presentation]
* 16 June 2023: Discussion of recent reproducibility measurements and possible future events. [https://wiki.cansas.org/images/e/ef/Minutes_of_Meeting_-_2023-06-16.pdf Minutes]
* 20 January 2023: Discussion of recent test measurements and data analysis. [https://wiki.cansas.org/images/c/cb/Minutes_of_Meeting_-_2023-01-20.pdf Minutes]
* 13 September 2022: Working group introduced to canSAS members at [[canSAS-XII | canSAS-XII]] in Campinas, Brazil. [https://wiki.cansas.org/images/8/89/202209_SESANS-WG_canSAS-2.pdf Presentation]
* 30 November 2021: Discussion of recent measurements of possible standard samples and plans for next test measurements. [https://wiki.cansas.org/images/0/0d/Minutes_of_WG_Meeting_-_2021-11-30.pdf Minutes]
* 22 March 2021: Inaugural meeting of the group. [https://wiki.cansas.org/images/4/45/Minutes_of_Initial_Meeting_-_2021-03-22.pdf Minutes]

== SESANS Nomenclature ==
As a group, we recommend the following nomenclature for SESANS measurements to ensure consistency between instruments and the literature.

SESANS data are measured as a function of a parameter called the "spin-echo length". This is represented by the variable δ. We do not recommend a preferred unit, and the choice of unit (μm, nm, or Å) should be chosen to suit the natural length scale of the measurement.

SESANS data itself are referred to as the "normalized scattering correlation function". This is a normalization of the experimentally measured parameters, the polarization of the sample (P) and the polarization of the reference (P0). These are combined to give the recommended presentation of SESANS data, the natural logarithm of P/P0 divided by sample thickness (t) and the square of the neutron wavelength (λ2), for brevity ln(P/P0)/(t*λ2). These are the two current recommended normalizations, and dividing by them should give instrument and wavelength independent data. There is no recommended variable for the normalized scattering correlation function. We recommend using the unit (cm-1 Å-2) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).

== Data Repository ==
Data from possible standards can be shared on the working group's [https://zenodo.org/communities/sesans_reproducibility_working_group/ Zenodo community].

Data will be reviewed to ensure that they comply with current file standards (*.ses) before acceptance.

== SESANS Instruments ==
* Larmor instrument at ISIS Neutron and Muon Source (UK) [https://www.isis.stfc.ac.uk/Pages/Larmor.aspx ISIS Larmor]
* SESANS instrument at Reactor Institute Delft, TU Delft (The Netherlands) [https://www.tudelft.nl/en/faculty-of-applied-sciences/business/facilities/reactor-institute-delft/research-instruments/sesans Research instruments SESANS]
* SESANS at Oak Ridge National Lab (USA) [https://fankangli.ornl.gov/sesans/ SESANS 1-D Ultra Low Q Small Angle Neutron Scattering]

== Mailing List ==
The Working Group maintains a mailing list to provide updates on activities and relevant data. You can subscribe to this at the [https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=SESANS-WORKING-GROUP&A=1 JiscMail mailing list sign up form].

[[Category:Working Groups]]

= Session Notes SAS2024 - Sun 2024-11-03 =

=== Topic: Cross-calibration ===
* Following round-robin reference samples have been used so far for SESANS at several sources (according to Wim Bouwman): Flexi-Por, Papyex. These measurements have also been compared to SANS/USANS results from the same samples.
* But: these kinds of samples have the disadvantage that they show artifacts when used for TOF-SESANS.
* Also, the presented reference data had differences in peak-minima of measured reverence samples at different sources. The reason for this difference still has to be identified.
* General consens: We need more sets of standard samples at all facilities

=== Notes from the discussion round: ===

* What is needed: New standard samples with shorter length scales of around 50nm (but such gratings are difficult to make)
* The question was raised if new round robin samples should be fabricated which can be handed from facility to facility. On the other hand, a good reference sample depends on each use-case - there is no perfect standard sample for several techniques/facilities. Instead, good existing standard samples (like the above mentioned and already measured Flexi-Por/Papyex) should be used.

File:SESANS canSAS 2024.pdf

2025-03-12T13:55:29Z

Gnsmith: Title: "SESANS Reproducibility Working Group: Update and Activities"; Event: canSAS-XIV, Taipei; Presenter: Wim Bouwman (TU Delft)

== Summary ==
Title: "SESANS Reproducibility Working Group: Update and Activities"; Event: canSAS-XIV, Taipei; Presenter: Wim Bouwman (TU Delft)

File:GNS canSAS2023 SESANS.pdf

2025-03-12T13:52:59Z

Gnsmith: /* Summary */

== Summary ==
Title: "SESANS Reproducibility Working Group"; Event: canSAS-2023, Grenoble; Presenter: Gregory Smith (ISIS)

File:GNS canSAS2023 SESANS.pdf

2025-03-12T13:49:00Z

Gnsmith: Title: "SESANS Reproducibility Working Group" Event: canSAS-2023, Grenoble Presenter: Gregory Smith (ISIS)

== Summary ==
Title: "SESANS Reproducibility Working Group"
Event: canSAS-2023, Grenoble
Presenter: Gregory Smith (ISIS)

SESANS Reproducibility Working Group

2024-10-25T15:47:45Z

Gnsmith: /* News and Status */

The spin-echo SANS (SESANS) working group is a subgroup of the [[Reproducibility_and_Reliability_Working_Group | canSAS Reproducibility and Reliability Working Group]].

== Mission ==
Spin-echo small-angle neutron scattering (SESANS) is a variant of small-angle neutron scattering that uses the Larmor precession of polarised neutrons to study the structure of materials in real space and up to length scales of some ten micrometer.

The mission of this group is to achieve SESANS measurements that provide data on an absolute scale independent from the used instrument. They do this by discussing the development of standard calibration samples and considering issues of reproducibility between different instruments, ensuring that data are trustworthy, reliable, and comparable.

== Members ==
* Wim Bouwman (TU Delft)
* Robert Dalgliesh (ISIS Neutron and Muon Source)
* Henrich Frielinghaus (Jülich Centre for Neutron Science, MLZ)
* Fankang Li (Oak Ridge National Laboratory)
* Andrew Parnell (The University of Sheffield)
* Steven Parnell (ISIS Neutron and Muon Source)
* Roger Pynn (Indiana University Bloomington)
* Gregory Smith (Chair, ISIS Neutron and Muon Source)

== News and Status ==
* 25 January 2024: Discussion of current and future SESANS data formats.
* 16 June 2023: Discussion of recent reproducibility measurements and possible future events. [https://wiki.cansas.org/images/e/ef/Minutes_of_Meeting_-_2023-06-16.pdf Minutes]
* 20 January 2023: Discussion of recent test measurements and data analysis. [https://wiki.cansas.org/images/c/cb/Minutes_of_Meeting_-_2023-01-20.pdf Minutes]
* 13 September 2022: Working group introduced to canSAS members at [[canSAS-XII | canSAS-XII]]. [https://wiki.cansas.org/images/8/89/202209_SESANS-WG_canSAS-2.pdf Presentation]
* 30 November 2021: Discussion of recent measurements of possible standard samples and plans for next test measurements. [https://wiki.cansas.org/images/0/0d/Minutes_of_WG_Meeting_-_2021-11-30.pdf Minutes]
* 22 March 2021: Inaugural meeting of the group. [https://wiki.cansas.org/images/4/45/Minutes_of_Initial_Meeting_-_2021-03-22.pdf Minutes]

== SESANS Nomenclature ==
As a group, we recommend the following nomenclature for SESANS measurements to ensure consistency between instruments and the literature.

SESANS data are measured as a function of a parameter called the "spin-echo length". This is represented by the variable δ. We do not recommend a preferred unit, and the choice of unit (μm, nm, or Å) should be chosen to suit the natural length scale of the measurement.

SESANS data itself are referred to as the "normalized scattering correlation function". This is a normalization of the experimentally measured parameters, the polarization of the sample (P) and the polarization of the reference (P0). These are combined to give the recommended presentation of SESANS data, the natural logarithm of P/P0 divided by sample thickness (t) and the square of the neutron wavelength (λ2), for brevity ln(P/P0)/(t*λ2). These are the two current recommended normalizations, and dividing by them should give instrument and wavelength independent data. There is no recommended variable for the normalized scattering correlation function. We recommend using the unit (cm-1 Å-2) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).

== Data Repository ==
Data from possible standards can be shared on the working group's [https://zenodo.org/communities/sesans_reproducibility_working_group/ Zenodo community].

Data will be reviewed to ensure that they comply with current file standards (*.ses) before acceptance.

== SESANS Instruments ==
* Larmor instrument at ISIS Neutron and Muon Source (UK) [https://www.isis.stfc.ac.uk/Pages/Larmor.aspx ISIS Larmor]
* SESANS instrument at Reactor Institute Delft, TU Delft (The Netherlands) [https://www.tudelft.nl/en/faculty-of-applied-sciences/business/facilities/reactor-institute-delft/research-instruments/sesans Research instruments SESANS]
* SESANS at Oak Ridge National Lab (USA) [https://fankangli.ornl.gov/sesans/ SESANS 1-D Ultra Low Q Small Angle Neutron Scattering]

== Mailing List ==
The Working Group maintains a mailing list to provide updates on activities and relevant data. You can subscribe to this at the [https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=SESANS-WORKING-GROUP&A=1 JiscMail mailing list sign up form].

[[Category:Working Groups]]

SESANS Reproducibility Working Group

2024-08-14T11:33:37Z

Gnsmith: /* Members */ updated member affiliation

The spin-echo SANS (SESANS) working group is a subgroup of the [[Reproducibility_and_Reliability_Working_Group | canSAS Reproducibility and Reliability Working Group]].

== Mission ==
Spin-echo small-angle neutron scattering (SESANS) is a variant of small-angle neutron scattering that uses the Larmor precession of polarised neutrons to study the structure of materials in real space and up to length scales of some ten micrometer.

The mission of this group is to achieve SESANS measurements that provide data on an absolute scale independent from the used instrument. They do this by discussing the development of standard calibration samples and considering issues of reproducibility between different instruments, ensuring that data are trustworthy, reliable, and comparable.

== Members ==
* Wim Bouwman (TU Delft)
* Robert Dalgliesh (ISIS Neutron and Muon Source)
* Henrich Frielinghaus (Jülich Centre for Neutron Science, MLZ)
* Fankang Li (Oak Ridge National Laboratory)
* Andrew Parnell (The University of Sheffield)
* Steven Parnell (ISIS Neutron and Muon Source)
* Roger Pynn (Indiana University Bloomington)
* Gregory Smith (Chair, ISIS Neutron and Muon Source)

== News and Status ==
* 16 June 2023: Discussion of recent reproducibility measurements and possible future events. [https://wiki.cansas.org/images/e/ef/Minutes_of_Meeting_-_2023-06-16.pdf Minutes]
* 20 January 2023: Discussion of recent test measurements and data analysis. [https://wiki.cansas.org/images/c/cb/Minutes_of_Meeting_-_2023-01-20.pdf Minutes]
* 13 September 2022: Working group introduced to canSAS members at [[canSAS-XII | canSAS-XII]]. [https://wiki.cansas.org/images/8/89/202209_SESANS-WG_canSAS-2.pdf Presentation]
* 30 November 2021: Discussion of recent measurements of possible standard samples and plans for next test measurements. [https://wiki.cansas.org/images/0/0d/Minutes_of_WG_Meeting_-_2021-11-30.pdf Minutes]
* 22 March 2021: Inaugural meeting of the group. [https://wiki.cansas.org/images/4/45/Minutes_of_Initial_Meeting_-_2021-03-22.pdf Minutes]

== SESANS Nomenclature ==
As a group, we recommend the following nomenclature for SESANS measurements to ensure consistency between instruments and the literature.

SESANS data are measured as a function of a parameter called the "spin-echo length". This is represented by the variable δ. We do not recommend a preferred unit, and the choice of unit (μm, nm, or Å) should be chosen to suit the natural length scale of the measurement.

SESANS data itself are referred to as the "normalized scattering correlation function". This is a normalization of the experimentally measured parameters, the polarization of the sample (P) and the polarization of the reference (P0). These are combined to give the recommended presentation of SESANS data, the natural logarithm of P/P0 divided by sample thickness (t) and the square of the neutron wavelength (λ2), for brevity ln(P/P0)/(t*λ2). These are the two current recommended normalizations, and dividing by them should give instrument and wavelength independent data. There is no recommended variable for the normalized scattering correlation function. We recommend using the unit (cm-1 Å-2) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).

== Data Repository ==
Data from possible standards can be shared on the working group's [https://zenodo.org/communities/sesans_reproducibility_working_group/ Zenodo community].

Data will be reviewed to ensure that they comply with current file standards (*.ses) before acceptance.

== SESANS Instruments ==
* Larmor instrument at ISIS Neutron and Muon Source (UK) [https://www.isis.stfc.ac.uk/Pages/Larmor.aspx ISIS Larmor]
* SESANS instrument at Reactor Institute Delft, TU Delft (The Netherlands) [https://www.tudelft.nl/en/faculty-of-applied-sciences/business/facilities/reactor-institute-delft/research-instruments/sesans Research instruments SESANS]
* SESANS at Oak Ridge National Lab (USA) [https://fankangli.ornl.gov/sesans/ SESANS 1-D Ultra Low Q Small Angle Neutron Scattering]

== Mailing List ==
The Working Group maintains a mailing list to provide updates on activities and relevant data. You can subscribe to this at the [https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=SESANS-WORKING-GROUP&A=1 JiscMail mailing list sign up form].

[[Category:Working Groups]]

SESANS Reproducibility Working Group

2023-10-03T08:07:02Z

Gnsmith: added a missing "not", removed an unnecessary "in" in SESANS Nomenclature section

The spin-echo SANS (SESANS) working group is a subgroup of the [[Reproducibility_and_Reliability_Working_Group | canSAS Reproducibility and Reliability Working Group]].

== Mission ==
Spin-echo small-angle neutron scattering (SESANS) is a variant of small-angle neutron scattering that uses the Larmor precession of polarised neutrons to study the structure of materials in real space and up to length scales of some ten micrometer.

The mission of this group is to achieve SESANS measurements that provide data on an absolute scale independent from the used instrument. They do this by discussing the development of standard calibration samples and considering issues of reproducibility between different instruments, ensuring that data are trustworthy, reliable, and comparable.

== Members ==
* Wim Bouwman (TU Delft)
* Robert Dalgliesh (ISIS Neutron and Muon Source)
* Henrich Frielinghaus (Jülich Centre for Neutron Science, MLZ)
* Fankang Li (Oak Ridge National Laboratory)
* Andrew Parnell (The University of Sheffield)
* Steven Parnell (TU Delft)
* Roger Pynn (Indiana University Bloomington)
* Gregory Smith (Chair, ISIS Neutron and Muon Source)

== News and Status ==
* 16 June 2023: Discussion of recent reproducibility measurements and possible future events. [https://wiki.cansas.org/images/e/ef/Minutes_of_Meeting_-_2023-06-16.pdf Minutes]
* 20 January 2023: Discussion of recent test measurements and data analysis. [https://wiki.cansas.org/images/c/cb/Minutes_of_Meeting_-_2023-01-20.pdf Minutes]
* 13 September 2022: Working group introduced to canSAS members at [[canSAS-XII | canSAS-XII]]. [https://wiki.cansas.org/images/8/89/202209_SESANS-WG_canSAS-2.pdf Presentation]
* 30 November 2021: Discussion of recent measurements of possible standard samples and plans for next test measurements. [https://wiki.cansas.org/images/0/0d/Minutes_of_WG_Meeting_-_2021-11-30.pdf Minutes]
* 22 March 2021: Inaugural meeting of the group. [https://wiki.cansas.org/images/4/45/Minutes_of_Initial_Meeting_-_2021-03-22.pdf Minutes]

== SESANS Nomenclature ==
As a group, we recommend the following nomenclature for SESANS measurements to ensure consistency between instruments and the literature.

SESANS data are measured as a function of a parameter called the "spin-echo length". This is represented by the variable δ. We do not recommend a preferred unit, and the choice of unit (μm, nm, or Å) should be chosen to suit the natural length scale of the measurement.

SESANS data itself are referred to as the "normalized scattering correlation function". This is a normalization of the experimentally measured parameters, the polarization of the sample (P) and the polarization of the reference (P0). These are combined to give the recommended presentation of SESANS data, the natural logarithm of P/P0 divided by sample thickness (t) and the square of the neutron wavelength (λ2), for brevity ln(P/P0)/(t*λ2). These are the two current recommended normalizations, and dividing by them should give instrument and wavelength independent data. There is no recommended variable for the normalized scattering correlation function. We recommend using the unit (cm-1 Å-2) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).

== Data Repository ==
Data from possible standards can be shared on the working group's [https://zenodo.org/communities/sesans_reproducibility_working_group/ Zenodo community].

Data will be reviewed to ensure that they comply with current file standards (*.ses) before acceptance.

== SESANS Instruments ==
* Larmor instrument at ISIS Neutron and Muon Source (UK) [https://www.isis.stfc.ac.uk/Pages/Larmor.aspx ISIS Larmor]
* SESANS instrument at Reactor Institute Delft, TU Delft (The Netherlands) [https://www.tudelft.nl/en/faculty-of-applied-sciences/business/facilities/reactor-institute-delft/research-instruments/sesans Research instruments SESANS]
* SESANS at Oak Ridge National Lab (USA) [https://fankangli.ornl.gov/sesans/ SESANS 1-D Ultra Low Q Small Angle Neutron Scattering]

== Mailing List ==
The Working Group maintains a mailing list to provide updates on activities and relevant data. You can subscribe to this at the [https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=SESANS-WORKING-GROUP&A=1 JiscMail mailing list sign up form].

[[Category:Working Groups]]

SESANS Reproducibility Working Group

2023-10-03T08:05:25Z

Gnsmith: Added a sentence to SESANS nomenclature section about normalizations

The spin-echo SANS (SESANS) working group is a subgroup of the [[Reproducibility_and_Reliability_Working_Group | canSAS Reproducibility and Reliability Working Group]].

== Mission ==
Spin-echo small-angle neutron scattering (SESANS) is a variant of small-angle neutron scattering that uses the Larmor precession of polarised neutrons to study the structure of materials in real space and up to length scales of some ten micrometer.

The mission of this group is to achieve SESANS measurements that provide data on an absolute scale independent from the used instrument. They do this by discussing the development of standard calibration samples and considering issues of reproducibility between different instruments, ensuring that data are trustworthy, reliable, and comparable.

== Members ==
* Wim Bouwman (TU Delft)
* Robert Dalgliesh (ISIS Neutron and Muon Source)
* Henrich Frielinghaus (Jülich Centre for Neutron Science, MLZ)
* Fankang Li (Oak Ridge National Laboratory)
* Andrew Parnell (The University of Sheffield)
* Steven Parnell (TU Delft)
* Roger Pynn (Indiana University Bloomington)
* Gregory Smith (Chair, ISIS Neutron and Muon Source)

== News and Status ==
* 16 June 2023: Discussion of recent reproducibility measurements and possible future events. [https://wiki.cansas.org/images/e/ef/Minutes_of_Meeting_-_2023-06-16.pdf Minutes]
* 20 January 2023: Discussion of recent test measurements and data analysis. [https://wiki.cansas.org/images/c/cb/Minutes_of_Meeting_-_2023-01-20.pdf Minutes]
* 13 September 2022: Working group introduced to canSAS members at [[canSAS-XII | canSAS-XII]]. [https://wiki.cansas.org/images/8/89/202209_SESANS-WG_canSAS-2.pdf Presentation]
* 30 November 2021: Discussion of recent measurements of possible standard samples and plans for next test measurements. [https://wiki.cansas.org/images/0/0d/Minutes_of_WG_Meeting_-_2021-11-30.pdf Minutes]
* 22 March 2021: Inaugural meeting of the group. [https://wiki.cansas.org/images/4/45/Minutes_of_Initial_Meeting_-_2021-03-22.pdf Minutes]

== SESANS Nomenclature ==
As a group, we recommend the following nomenclature for SESANS measurements to ensure consistency between instruments and in the literature.

SESANS data are measured as a function of a parameter called the "spin-echo length". This is represented by the variable δ. We do recommend a preferred unit, and the choice of unit (μm, nm, or Å) should be chosen to suit the natural length scale of the measurement.

SESANS data itself are referred to as the "normalized scattering correlation function". This is a normalization of the experimentally measured parameters, the polarization of the sample (P) and the polarization of the reference (P0). These are combined to give the recommended presentation of SESANS data, the natural logarithm of P/P0 divided by sample thickness (t) and the square of the neutron wavelength (λ2), for brevity ln(P/P0)/(t*λ2). These are the two current recommended normalizations, and dividing by them should give instrument and wavelength independent data. There is no recommended variable for the normalized scattering correlation function. We recommend using the unit (cm-1 Å-2) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).

== Data Repository ==
Data from possible standards can be shared on the working group's [https://zenodo.org/communities/sesans_reproducibility_working_group/ Zenodo community].

Data will be reviewed to ensure that they comply with current file standards (*.ses) before acceptance.

== SESANS Instruments ==
* Larmor instrument at ISIS Neutron and Muon Source (UK) [https://www.isis.stfc.ac.uk/Pages/Larmor.aspx ISIS Larmor]
* SESANS instrument at Reactor Institute Delft, TU Delft (The Netherlands) [https://www.tudelft.nl/en/faculty-of-applied-sciences/business/facilities/reactor-institute-delft/research-instruments/sesans Research instruments SESANS]
* SESANS at Oak Ridge National Lab (USA) [https://fankangli.ornl.gov/sesans/ SESANS 1-D Ultra Low Q Small Angle Neutron Scattering]

== Mailing List ==
The Working Group maintains a mailing list to provide updates on activities and relevant data. You can subscribe to this at the [https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=SESANS-WORKING-GROUP&A=1 JiscMail mailing list sign up form].

[[Category:Working Groups]]

SESANS Reproducibility Working Group

2023-10-03T08:03:32Z

Gnsmith: Added SESANS Nomenclature recommendations

SESANS Reproducibility Working Group

2023-08-14T13:07:46Z

Gnsmith: /* News and Status */ Extraneous link deleted.

SESANS Reproducibility Working Group

2023-08-14T13:06:44Z

Gnsmith: /* News and Status */ 16 June 2023 minutes added

File:Minutes of Meeting - 2023-06-16.pdf

2023-08-14T13:05:08Z

Gnsmith: Updated description

== Summary ==
Minutes of SESANS WG on 16 June 2023.

File:Minutes of Meeting - 2023-06-16.pdf

2023-08-14T13:02:03Z

Gnsmith:

Minutes of Meeting - 2023-06-16

SESANS Reproducibility Working Group

2023-05-18T12:23:42Z

Gnsmith: /* News and Status */

SESANS Reproducibility Working Group

2023-05-18T12:22:58Z

Gnsmith: /* News and Status */

File:Minutes of Meeting - 2023-01-20.pdf

2023-05-18T12:22:26Z

Gnsmith: Minutes of SESANS WG on 20 January 2023.

== Summary ==
Minutes of SESANS WG on 20 January 2023.

SESANS Reproducibility Working Group

2023-04-28T11:38:09Z

Gnsmith: /* News and Status */ Updated links and added most recent WG meeting

SESANS Reproducibility Working Group

2023-01-20T14:38:44Z

Gnsmith: Spacing corrected

SESANS Reproducibility Working Group

2023-01-20T14:38:08Z

Gnsmith: Link corrected

SESANS Reproducibility Working Group

2023-01-20T14:36:16Z

Gnsmith: Information about canSAS-XII presentation added

File:202209 SESANS-WG canSAS-2.pdf

2023-01-20T14:35:29Z

Gnsmith:

Presentation of SESANS Working Group from canSAS-XII

SESANS Reproducibility Working Group

2022-08-19T13:55:52Z

Gnsmith:

SESANS Reproducibility Working Group

2022-08-19T13:55:06Z

Gnsmith:

SESANS Reproducibility Working Group

2022-08-19T13:52:16Z

Gnsmith: Added PDF files of minutes

File:Minutes of Initial Meeting - 2021-03-22.pdf

2022-08-19T13:51:03Z

Gnsmith:

Minutes of SESANS WG Initial meeting on March 22, 2021

File:Minutes of WG Meeting - 2021-11-30.pdf

2022-08-19T13:47:34Z

Gnsmith:

PDF document of the minutes of the working group meeting from November 30, 2021

SESANS Reproducibility Working Group

2021-12-09T15:27:05Z

Gnsmith: Added mailing list

Reproducibility and Reliability Working Group

2021-12-08T15:59:12Z

Gnsmith: /* SESANS Working Group */

==Reliability and Reproducibility==

The group considers the issues that relate to reliability of results from small-angle scattering experiments, both as regards measured data and the parameters derived from analysis of the data that describe the samples. It had been established originally under the name 'Standardization' but has been renamed to provide a better description of the activities.

Anybody that is interested is welcome to join the mail group associated with this topic. Past messages are available at:
https://groups.google.com/forum/#!forum/cansas-rrwg and there is a button marked 'Apply to join group'.

==Members==
* John Barker (NIST)
* Peter Boesecke (ESRF Contact)
* Rex Hjelm (LANSCE)
* Jan Ilavsky (APS)
* Peter Lindner (ILL)
* Marc Malfois (Alba)
* Adrian Rennie (Uppsala University - chair)

==News/Status==

*June 2017. There is discussion of new activities at the canSAS-IX meeting related Reproducibility and Reliability. http://www.cansas.org/wgwiki/index.php/Reliability
*August 2015. The mailing list is now on Google Groups [https://groups.google.com/forum/#!forum/cansas-rrwg https://groups.google.com/forum/#!forum/cansas-rrwg]. A summary of recent activities will be presented at the [[SAS_2015_Berlin |lunch time session]] at the SAS2015 meeting in Berlin on Monday, September 14, 2015.
*A short account of the discussion concerning this topic at the canSAS-VIII meeting from 14 to 16 April 2015 in Tokai is available:

[[Discussion_Group_B2]]

Plans are being made (April 2015) for further types of sample to be circulated for comparative measurements.

*Discussion at the workshop in Uppsala has been presented on a separate page:

[[2012 Standards Discussion|canSAS 2012 meeting discussions]]

*Work was presented at the SAS-2012 conference (www.sas2012.com). This includes a summary of standardization in the canSAS session and a presentation on the latex round robin measurements.

[[canSAS at the SAS-2012 Conference]]

==Glassy Carbon Round Robin==
Two samples of glassy carbons from Jan Ilavsky have been doing the rounds. They've been to NIST, ILL, ISIS, APS, ESRF and Diamond and ANSTO.

Details and data here : [[ Glassy Carbon Round Robin ]]

==Polystyrene Latex Round Robin==
Samples of a monodisperse polystyrene latex have recently been measured at ILL (D22 and D11), ANSTO (Quokka), ISIS (SANS2D) and at NCNR (NG7). Samples are also at Diamond awaiting measurement.
Details and data here : [[ Latex Round Robin ]]

A new series of samples designated J, K, L and that have slightly different dilution have been provided for measurements at APS, FRMII, SPRING-8 and ILL.

Results of measurements with some conclusions are described in a publication in Journal of Applied Crystallography:

A. R. Rennie, M. S. Hellsing, K. Wood, E. P. Gilbert, L. Porcar, R. Schweins, C. D. Dewhurst, P. Lindner, R. K. Heenan, S. E. Rogers, P. D. Butler, J. R. Krzywon, R. E. Ghosh, A. J. Jackson and M. Malfois 'Learning about SANS instruments and data reduction from round robin measurements on samples of polystyrene latex', Journal of Applied Crystallography, 46, (2013). doi: 10.1107/S0021889813019468 [http://dx.doi.org/10.1107/S0021889813019468].

==Al ceramics masks==
In 2019, during CanSAS workshop, we (Anna Sokolova [https://www.ansto.gov.au/people/dr-anna-sokolova] and Brian Pauw [https://lookingatnothing.com/]) have had a discussion on a potential standard for SAXS/SANS measurements.

Al ceramics samples (masks) have been purchased from Smart membranes [http://www.smartmembranes.de/].
This material (it is also called 'Alumina membranes') has been used as an example for the SAXS/USAXS instrument testing, see B. R. Pauw, A. J. Smith, T. Snow, O. Shebanova, J. P. Sutter, J. Ilavsky, D. Hermida-Merino, G. J. Smales, N. J. Terrill, A. F. Thunemann, and W. Bras 'Extending synchrotron SAXS instrument ranges through addition of a portable, inexpensive USAXSmodule with vertical rotation axes'. Journal of Synchrotron Radiation, 28, (2021). doi: 10.1107/S1600577521003313 [https://doi.org/10.1107/S1600577521003313].
The material was also used in the study by A. Yildirim, K. Sentker, G. J. Smales, B. R. Pauw, P. Huberb, and A. Schonhals 'Collective orientational order and phase behavior of a discotic liquid crystal under nanoscale confinement'. Nanoscale Advances, 1, (2019). doi: 10.1039/c8na00308 [https://doi.org/10.1039/c8na00308d].

SAXS data have been collected at ... and look promising, showing several peaks.

SANS data have been collected on Bilby instrument [https://www.ansto.gov.au/our-facilities/australian-centre-for-neutron-scattering/neutron-scattering-instruments/bilby-small], ANSTO, using time-of-flight settings.
Unfortunately, it appears that Al ceramics is not a good material to use because of asymmetry in the membrane and massive multiple scattering, visible even at 4.5A wavelength.
In any way, we found it useful to present Bilby data here, for future reference.

Details and data here : [[ Al Ceramics ]]

==Calibration Procedures==

We will try to gather summaries of the procedures used for calibration of small-angle scattering instruments. It has been suggested that summaries of information would benefit both users and those who run instruments and facilities. Everyone is encouraged to contribute to this work in progress. Procedures for laboratory instruments as well as synchrotron and neutron facilities are welcome.

Details are here : [[ Calibration Procedures ]]

[[Category:Working Groups]]

==SESANS Working Group==

In 2021, a sub-working group was formed dedicated to issues of reproducibility and reliability of spin-echo SANS (SESANS) measurements.

Details are here : [[SESANS Reproducibility Working Group]]

Reproducibility and Reliability Working Group

2021-12-08T15:54:23Z

Gnsmith:

==Reliability and Reproducibility==

The group considers the issues that relate to reliability of results from small-angle scattering experiments, both as regards measured data and the parameters derived from analysis of the data that describe the samples. It had been established originally under the name 'Standardization' but has been renamed to provide a better description of the activities.

Anybody that is interested is welcome to join the mail group associated with this topic. Past messages are available at:
https://groups.google.com/forum/#!forum/cansas-rrwg and there is a button marked 'Apply to join group'.

==Members==
* John Barker (NIST)
* Peter Boesecke (ESRF Contact)
* Rex Hjelm (LANSCE)
* Jan Ilavsky (APS)
* Peter Lindner (ILL)
* Marc Malfois (Alba)
* Adrian Rennie (Uppsala University - chair)

==News/Status==

*June 2017. There is discussion of new activities at the canSAS-IX meeting related Reproducibility and Reliability. http://www.cansas.org/wgwiki/index.php/Reliability
*August 2015. The mailing list is now on Google Groups [https://groups.google.com/forum/#!forum/cansas-rrwg https://groups.google.com/forum/#!forum/cansas-rrwg]. A summary of recent activities will be presented at the [[SAS_2015_Berlin |lunch time session]] at the SAS2015 meeting in Berlin on Monday, September 14, 2015.
*A short account of the discussion concerning this topic at the canSAS-VIII meeting from 14 to 16 April 2015 in Tokai is available:

[[Discussion_Group_B2]]

Plans are being made (April 2015) for further types of sample to be circulated for comparative measurements.

*Discussion at the workshop in Uppsala has been presented on a separate page:

[[2012 Standards Discussion|canSAS 2012 meeting discussions]]

*Work was presented at the SAS-2012 conference (www.sas2012.com). This includes a summary of standardization in the canSAS session and a presentation on the latex round robin measurements.

[[canSAS at the SAS-2012 Conference]]

==Glassy Carbon Round Robin==
Two samples of glassy carbons from Jan Ilavsky have been doing the rounds. They've been to NIST, ILL, ISIS, APS, ESRF and Diamond and ANSTO.

Details and data here : [[ Glassy Carbon Round Robin ]]

==Polystyrene Latex Round Robin==
Samples of a monodisperse polystyrene latex have recently been measured at ILL (D22 and D11), ANSTO (Quokka), ISIS (SANS2D) and at NCNR (NG7). Samples are also at Diamond awaiting measurement.
Details and data here : [[ Latex Round Robin ]]

A new series of samples designated J, K, L and that have slightly different dilution have been provided for measurements at APS, FRMII, SPRING-8 and ILL.

Results of measurements with some conclusions are described in a publication in Journal of Applied Crystallography:

A. R. Rennie, M. S. Hellsing, K. Wood, E. P. Gilbert, L. Porcar, R. Schweins, C. D. Dewhurst, P. Lindner, R. K. Heenan, S. E. Rogers, P. D. Butler, J. R. Krzywon, R. E. Ghosh, A. J. Jackson and M. Malfois 'Learning about SANS instruments and data reduction from round robin measurements on samples of polystyrene latex', Journal of Applied Crystallography, 46, (2013). doi: 10.1107/S0021889813019468 [http://dx.doi.org/10.1107/S0021889813019468].

==Al ceramics masks==
In 2019, during CanSAS workshop, we (Anna Sokolova [https://www.ansto.gov.au/people/dr-anna-sokolova] and Brian Pauw [https://lookingatnothing.com/]) have had a discussion on a potential standard for SAXS/SANS measurements.

Al ceramics samples (masks) have been purchased from Smart membranes [http://www.smartmembranes.de/].
This material (it is also called 'Alumina membranes') has been used as an example for the SAXS/USAXS instrument testing, see B. R. Pauw, A. J. Smith, T. Snow, O. Shebanova, J. P. Sutter, J. Ilavsky, D. Hermida-Merino, G. J. Smales, N. J. Terrill, A. F. Thunemann, and W. Bras 'Extending synchrotron SAXS instrument ranges through addition of a portable, inexpensive USAXSmodule with vertical rotation axes'. Journal of Synchrotron Radiation, 28, (2021). doi: 10.1107/S1600577521003313 [https://doi.org/10.1107/S1600577521003313].
The material was also used in the study by A. Yildirim, K. Sentker, G. J. Smales, B. R. Pauw, P. Huberb, and A. Schonhals 'Collective orientational order and phase behavior of a discotic liquid crystal under nanoscale confinement'. Nanoscale Advances, 1, (2019). doi: 10.1039/c8na00308 [https://doi.org/10.1039/c8na00308d].

SAXS data have been collected at ... and look promising, showing several peaks.

SANS data have been collected on Bilby instrument [https://www.ansto.gov.au/our-facilities/australian-centre-for-neutron-scattering/neutron-scattering-instruments/bilby-small], ANSTO, using time-of-flight settings.
Unfortunately, it appears that Al ceramics is not a good material to use because of asymmetry in the membrane and massive multiple scattering, visible even at 4.5A wavelength.
In any way, we found it useful to present Bilby data here, for future reference.

Details and data here : [[ Al Ceramics ]]

==Calibration Procedures==

We will try to gather summaries of the procedures used for calibration of small-angle scattering instruments. It has been suggested that summaries of information would benefit both users and those who run instruments and facilities. Everyone is encouraged to contribute to this work in progress. Procedures for laboratory instruments as well as synchrotron and neutron facilities are welcome.

Details are here : [[ Calibration Procedures ]]

[[Category:Working Groups]]

==SESANS Working Group==

In 2021, a sub-working group was formed dedicated to issues of reproducibility and reliability of spin-echo SANS measurements.

Details are here : [[SESANS Reproducibility Working Group]]

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Gnsmith: Created page with "The spin-echo SANS (SESANS) working group is a subgroup of the Reproducibility_and_Reliability_Working_Group. == Mission == Spin-echo small-angle neutron scattering (SESA..."

The spin-echo SANS (SESANS) working group is a subgroup of the [[Reproducibility_and_Reliability_Working_Group]].

== Mission ==
Spin-echo small-angle neutron scattering (SESANS) is a variant of small-angle neutron scattering that uses the Larmor precession of polarised neutrons to study the structure of materials in real space and up to length scales of some ten micrometer.

The mission of this group is to achieve SESANS measurements that provide data on an absolute scale independent from the used instrument. They do this by discussing the development of standard calibration samples and considering issues of reproducibility between different instruments, ensuring that data are trustworthy, reliable, and comparable.