Optics Meeting Jun 26 2024 1100AM ET
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Agenda
- (Kate) Magnetic field verification
- (David) Sieve & Blocker delivery
- (Vassu) Effect of dead GEM HV sector
Attendance
Paul S., David, Kate, Buddhika, Vassu, Andrew, Juliette, Zuhal
Minutes
- (Kate) working on getting W&M undergrad (Evan Jackson) set up to continue the studies of sieve collimator hole images at GEMs on magnetic field imperfections.
- (Juliette) we can look at separate BFIL (magnetic field strength) values for upstream and downstream toroids, since the field maps are separate, and GEANT 4 will happily superimpose them. Buddhika is learning to get GEANT 4 up and running; he will soon be able to generate simulation files. Juliette plans on generating individual field maps for the 5 "coils" (meaning, 5 sections of magnet along the beam direction), so we can study effect of de-tuning field in one or more of them. May be able to compensate (for example) for an azimuthally symmetric radial missplacment of one coil set by adjusting current in a different coil set, so as to ensure that tracks arrive at the nominal locations on the main detectors. David asks that we also generate field maps with individual sector missalignments that are larger than the ones studied to date, so that we can interpolate rather than extrapolate when fitting changes in hole images.
- (David) Sieve and Blocker collimator have arrived at JLab, and match the specs: [1]
- (Vassu) Do we want to review kinematic factor presentation? Not at this meeting, let folks read slides from last meeting. Working on checking to see whether or not we can accept the SBU 2nd prototype GEM which has a dead HV sector on one side at large radius... can we find a sector location for it that none of our sieve collimator hole images will fall in that sector (for at least one Z-location) for any of our 12C elastic data at the three beam energies?
Meeting link information
See email invitation, or contact David Armstrong or Kate Evans for Zoom link
