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2016-06-14-memo physics » History » Version 2

Rogers, Chris, 14 June 2016 13:56

1 1 Rogers, Chris
h1. 2016-06-14-memo physics
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h2. Emittance paper
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* First meeting with refereees
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** Need more detail on reconstruction - "proof" that the detectors work
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** Need to untangle assumption of cylindrical symmetry implicit in Penn definitions; e.g. eigenemittances etc?
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* Rogers/Jan Greis looking at tracker recon and comparison with TOF
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** Picked up problems with detector alignment in straight tracks data for MC; suspect ongoing bugs still in tracker recon software
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** Now have Kalman fit working for non-uniform fields; going through algorithm optimisation/tuning; compare with SciFi and MC truth; residuals comparable to SciFi residuals so far
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** Can start looking at solenoid alignment, but need to work through any remaining issues in the tracker alignment/software
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* Durga is working through TOF features
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** Systematic error on TOF based on rate effects
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** Systematic error on TOF due to off axis path length of electrons used in TOF calibration
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* Scott is working through PID issues
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** Quite strong confirmation that the "muon shoulder" arises due to the diffuser support
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** Found that we do not have sufficient data to validate the PID routines by comparison between TOF/tracker and EMR
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*** EMR pion rejection is not good enough
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*** Have to use MC for validation instead
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* MC sample shows improved agreement with data
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** Main issue -> few MeV/c pz offset between MC and data
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h2. Scattering paper
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* Ryan has complete end-to-end analysis
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* Get good agreement with Cobb-Carlisle model and data
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* Working through the systematics
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* Worried about systematic influence of MC on the analysis
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* Also considering Fourier-transform based deconvolution
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* Also considering "empty data + scattering model"
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h2. Cooling Demo paper
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* JB has note in good order
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* Held up due to illness
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* Referee meeting planned for Monday 20th June
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* I have final draft, in the end without recon, to pass to referees
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h2. Other things
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* Magnet alignment via transfer matrices - Sophie has numbers on the FC alignment; but analysis of straight tracks data is not showing tracker alignment => issues in tracker recon
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* Magnet alignment via minimise residuals - depends on global track fitting routines, which Rogers is working on
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* Beamline optimisation - Paolo is working on momentum selection, before going through details of quad optimisation; advice is to focus on "no diffuser" settings for 3 T in SSU
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h2. July run plan
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* I have a partial run plan note
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* Working through "measurement coordinators" and some of the details