round robin: Difference between revisions

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(Created page with "==Q Standard Round Robin == This page is the working page for the Q Standard round robin. ==Members== * Joseph Kline (NIST - chair) * Adrian Rennie (Uppsala University) * Paul Butler (NIST) * Others TBA ==Planning Thoughts== * Shipping a valuable sample internationally without incurring taxes will require some careful planning/ thought. It may be easiest to ship back and forth from a central place (NIST seems the most natural in this case) rather than actually pass th...")
 
 
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==Members==
==Members==
* Joseph Kline (NIST - chair)
* Joseph Kline (NIST - chair)
* Caitlyn Wolf (NIST)
* Adrian Rennie (Uppsala University)
* Adrian Rennie (Uppsala University)
* Paul Butler (NIST)
* Paul Butler (NIST - temporary?)
* Others TBA
* Others TBA


==Planning Thoughts==
Round robin consists of a tungsten grating calibration sample and three "unknown" block copolymer samples with different characteristic length scales. The round robin is blinded so that participants do not know the exact pitch of the tungsten grating calibration sample. The round robin will test current calibration methods used by beamlines and the improvement of calibration obtained by using the new calibration sample.
* Shipping a valuable sample internationally without incurring taxes will require some careful planning/ thought. It may be easiest to ship back and forth from a central place (NIST seems the most natural in this case) rather than actually pass the same artifact around directly? Also arrange for return shipping as part of shipping?
 
* Need to develop protocol to send to each participant. How well the protocol works will help in refining the final protocol sent with the artifact. Protocol should probably include:
Round Robin Process
** calibrate instrument in usual way
* Sample set consisting of tungsten grating calibration sample and three "unknown" block copolymers
** measuring a standard nanoparticle sample
** Five similar sample sets will travel between facilities. Each set is slightly different, but pitches are known by NIST
** measuring the artifact using a rocking curve to ensure a proper measurement
* Participants will receive a sample set, conduct their normal calibration measurement, measure the tungsten grating sample like they would measure a calibration sample, then measure the unknown block copolymer samples
** measuring the artifact rotating around the center point to get Qx and Qy on the detector
* Participants will report their results and estimated values of grating pitch and block copolymer length scales using their normal calibration
** position accuracy of 1mm is probably good enough
* Sample set will be returned to NIST and then sent to next participant
** rotational accuracy of 0.1 degrees is probably sufficient
* NIST will compile results and send participants the pitch of the grating sample that they measured to recalibrate their measurements
** return measured pitch.
* Final results will be combined into a publication
 
Round Robin Details
* 34 SAXS beamlines have responded to invitation to participate in the round robin
* First sample sets were shipped out on June 4, 2026 with goal of completing the round robin measurements in the calendar year 2026
* If interested in participating in the round robin, please contact saxs@nist.gov
* The current calibration sample is optimized for SAXS. An additional calibration sample is being developed with much large area pattern for neutron scattering

Latest revision as of 14:45, 5 June 2026

Q Standard Round Robin

This page is the working page for the Q Standard round robin.

Members

  • Joseph Kline (NIST - chair)
  • Caitlyn Wolf (NIST)
  • Adrian Rennie (Uppsala University)
  • Paul Butler (NIST - temporary?)
  • Others TBA

Round robin consists of a tungsten grating calibration sample and three "unknown" block copolymer samples with different characteristic length scales. The round robin is blinded so that participants do not know the exact pitch of the tungsten grating calibration sample. The round robin will test current calibration methods used by beamlines and the improvement of calibration obtained by using the new calibration sample.

Round Robin Process

  • Sample set consisting of tungsten grating calibration sample and three "unknown" block copolymers
    • Five similar sample sets will travel between facilities. Each set is slightly different, but pitches are known by NIST
  • Participants will receive a sample set, conduct their normal calibration measurement, measure the tungsten grating sample like they would measure a calibration sample, then measure the unknown block copolymer samples
  • Participants will report their results and estimated values of grating pitch and block copolymer length scales using their normal calibration
  • Sample set will be returned to NIST and then sent to next participant
  • NIST will compile results and send participants the pitch of the grating sample that they measured to recalibrate their measurements
  • Final results will be combined into a publication

Round Robin Details

  • 34 SAXS beamlines have responded to invitation to participate in the round robin
  • First sample sets were shipped out on June 4, 2026 with goal of completing the round robin measurements in the calendar year 2026
  • If interested in participating in the round robin, please contact saxs@nist.gov
  • The current calibration sample is optimized for SAXS. An additional calibration sample is being developed with much large area pattern for neutron scattering
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