SESANS Reproducibility Working Group - Revision history

Gnsmith: /* News and Status */

2025-03-12T14:24:20Z

News and Status

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	* 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]		* 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.		* 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]		* 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]		* 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]		* 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]

Gnsmith: added data reproducibility round robin section

2025-03-12T14:14:24Z

added data reproducibility round robin section

← Older revision		Revision as of 14:14, 12 March 2025
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	Data will be reviewed to ensure that they comply with current file standards (*.ses) before acceptance.		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 ==		== SESANS Instruments ==

Gnsmith: Removed canSAS SESANS WG discussion notes

2025-03-12T13:59:02Z

Removed canSAS SESANS WG discussion notes

← Older revision		Revision as of 13:59, 12 March 2025
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	[[Category:Working Groups]]		[[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.

Gnsmith: /* News and Status */

2025-03-12T13:56:41Z

News and Status

← Older revision		Revision as of 13:56, 12 March 2025
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	== News and Status ==		== 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]		* 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.		* 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]		* 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]

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

2025-03-12T13:56:07Z

News and Status: added recent news and files

← Older revision		Revision as of 13:56, 12 March 2025
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	== News and Status ==		== 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.		* 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]		* 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]		* 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]		* 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]		* 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]		* 22 March 2021: Inaugural meeting of the group. [https://wiki.cansas.org/images/4/45/Minutes_of_Initial_Meeting_-_2021-03-22.pdf Minutes]

Annikastellhorn at 15:14, 5 November 2024

2024-11-05T15:14:47Z

← Older revision		Revision as of 15:14, 5 November 2024
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	[[Category:Working Groups]]		[[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.

Gnsmith: /* News and Status */

2024-10-25T15:47:45Z

News and Status

← Older revision		Revision as of 15:47, 25 October 2024
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	== News and Status ==		== 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]		* 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]		* 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]

Gnsmith: /* Members */ updated member affiliation

2024-08-14T11:33:37Z

Members: updated member affiliation

← Older revision		Revision as of 11:33, 14 August 2024
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	* Fankang Li (Oak Ridge National Laboratory)		* Fankang Li (Oak Ridge National Laboratory)
	* Andrew Parnell (The University of Sheffield)		* Andrew Parnell (The University of Sheffield)
	* Steven Parnell (~~TU Delft~~)		* Steven Parnell (ISIS Neutron and Muon Source)
	* Roger Pynn (Indiana University Bloomington)		* Roger Pynn (Indiana University Bloomington)
	* Gregory Smith (Chair, ISIS Neutron and Muon Source)		* Gregory Smith (Chair, ISIS Neutron and Muon Source)

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

2023-10-03T08:07:02Z

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

← Older revision		Revision as of 08:07, 3 October 2023
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	== SESANS Nomenclature ==		== SESANS Nomenclature ==
	As a group, we recommend the following nomenclature for SESANS measurements to ensure consistency between instruments and in the literature.		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 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 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 (λ<sup>2</sup>), for brevity ln(P/P0)/(t*λ<sup>2</sup>). 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<sup>-1</sup> Å<sup>-2</sup>) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).		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 (λ<sup>2</sup>), for brevity ln(P/P0)/(t*λ<sup>2</sup>). 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<sup>-1</sup> Å<sup>-2</sup>) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).

Gnsmith: Added a sentence to SESANS nomenclature section about normalizations

2023-10-03T08:05:25Z

Added a sentence to SESANS nomenclature section about normalizations

← Older revision		Revision as of 08:05, 3 October 2023
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	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 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 (λ<sup>2</sup>), for brevity ln(P/P0)/(t*λ<sup>2</sup>). There is no recommended variable for ~~this~~. We recommend using the unit (cm<sup>-1</sup> Å<sup>-2</sup>) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).		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 (λ<sup>2</sup>), for brevity ln(P/P0)/(t*λ<sup>2</sup>). 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<sup>-1</sup> Å<sup>-2</sup>) for this, using natural units for sample thickness and scattering cross section (cm) and for neutron wavelength (Å).

	== Data Repository ==		== Data Repository ==