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Diagnostics¶
There will be an analysis/diagnostics meeting Thursday 26th November, 14:00.
We will be in one of the usual meeting rooms in the Atlas building, using phone:
http://mice.iit.edu/phonebridge.html
- Optics review
- Tracker resolution and efficiency - Tracker Group
- Tracker-to-tracker alignment - Melissa/Chris Hunt/John Nugent
- Tracker Survey
- Tracker alignment to field - Chris Rogers/Sophie
- Cut-based beam selection vs 2015/01 data - Tanaz/Scott Wilbur
- Ckov momentum scan - Ao, Durga
- Full PID vs 2015/01 data - Celeste
- PID detector alignment - Francois
- Detector Efficiencies - Jan/Francois
- Paper: High precision measurement of emittance - Chris Hunt/Victoria
- Date of next meeting
- 10th December
- 17th December - if we have data in the meantime
Notes¶
Durga Rajaram
Chris Rogers
Francois Drielsma
Adam Dobbs
Scott Wilbur
Chris Hunt
Tanaz Mohayai
John Nyugent
Ed Overton
- Took a step back from the alignment stuff following CM due to tracker geometry issues
- Fixing data structure, analysis scripts
- Main issue is pz resolution and systematic mismeasurement
- Bug that has been floating around for quite a while
- On the order of 1-2 MeV/c in MC
- Looks like energy loss calculations were incorrect for some reason
- Gradient of energy loss was different in MC and MC recon
- But the error is more significant in data
- Likely causes
- Field non-uniformity
- Field drop-off is around the TRP
- Rogers notes there is also a 1-2 mrad misalignment
- Rogers notes there is a miscalculation in MAUS due to the iron
- Subtle issues with Kalman algorithm
- Kalman is inherently linear
- Helix is inherently non-linear
- Helix is correct to first order
- SciFi is made of fibres
- Energy loss in Kalman is done "outside" the algorithm and hacked into Kalman;
- energy loss is not tied into the smoothing step due to the funny way the propagator is done
- Paul Soler notes parameterising energy loss as a polynomial fit worked okay, paper written and published
- Field non-uniformity
- Durga asks what is the effect in < 4 T data
- Chris Hunt notes that he can do the work but could be helped by spreading round some of his other responsibilities
- Tracker alignment meeting; update on how things are going
- Some useful suggestions
- See slides
- Note that there is additionally a transverse (momentum dependent) distribution; try taking a fiducial cut on e.g. the central bar
- Working on modifying existing code for cut-based analysis
- Produce an output for the PID based on different detectors
- Note TOF is not trivial
Updated by Rogers, Chris almost 8 years ago ยท 7 revisions