Ticket #2612 (closed: fixed)

Opened 10 years ago

Last modified 5 years ago

Inaccurate values near the end of the Q range

Reported by: Steve Williams Owned by: Steve Williams
Priority: critical Milestone: Iteration 28
Component: Mantid Keywords:
Cc: Blocked By:
Blocking: Tester: Michael Reuter

Description

Email from Richard.

Again Mantid has an extra bin at smallest Q ( 5ang next to beam stop) and though in the middle Colette (dots) agrees well with Mantid there are systematic differences at both the lowest and highest Q’s.  

Need to see whether there are pixels and/or wavelength bins at the stop & start of the ranges that are being over-intepolated rather than ignored. Perhaps we need to “round in” rather than “round out” in some places for safety in Mantid?

Change History

comment:1 Changed 10 years ago by Steve Williams

  • Status changed from new to accepted

A Mantid release in Apr 2010 (version 1.0.4241) showed points towards the end of the range away from the main curve but normally within the errorbar.

comment:2 Changed 10 years ago by Steve Williams

(In [9950]) SANS masking at ISIS now always assumes the beam centre is at the centre of the detector re #2612

comment:3 Changed 10 years ago by Steve Williams

(In [9974]) Run numbers entered into a RunFile widget ending in "-add" will cause a file whose name ends in -add to be loaded. Fix system tests re #2612 and #2337

comment:4 Changed 10 years ago by Steve Williams

(In [10306]) Flatbackground now works for non-distribution data and SANS Display Mask is now clearer re #2612 fixes #2599

comment:5 Changed 10 years ago by Steve Williams

(In [10307]) Better Display Mask in ISIS SANS re #2612

comment:6 Changed 10 years ago by Steve Williams

(In [10309]) DoxyGen spelling mistake fix re #2612

comment:7 Changed 10 years ago by Steve Williams

(In [10408]) Ensure it runs the ends of the loop re #2612

comment:8 Changed 10 years ago by Steve Williams

(In [10482]) The GUI always overwrites settings from the user file re #2612

comment:9 Changed 9 years ago by Steve Williams

  • Status changed from accepted to verify
  • Resolution set to fixed

The spurious counts at the low Q range of LOQ experiments have gone now because the mask is in the correct place

comment:10 Changed 9 years ago by Michael Reuter

  • Status changed from verify to verifying
  • Tester set to Michael Reuter

comment:11 Changed 9 years ago by Michael Reuter

  • Status changed from verifying to closed

The spurious dropping points at low Q are no longer present, so the fix worked.

comment:12 Changed 5 years ago by Stuart Campbell

This ticket has been transferred to github issue 3459

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