GlueX Start Counter Meeting, June 28, 2018
GlueX Start Counter Meeting
Thursday, June 28, 2018
10:00 am EDT
CEBAF Center, Room L207
BlueJeans: 556 286 544
- Review minutes from the meeting on June 14
- Calibration and Efficiency
- Time-dependent geometry adjustments
- Action Item Review
- The BlueJeans Meeting ID is 556 286 544 .
- Connect to the Meeting
Talks can be deposited in the directory
/group/halld/www/halldweb/html/talks/2018 on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2018/ .
- FIU: Werner Boeglin, Mahmoud Kamel
- FSU: Sean Dobbs
- JLab: Mark Ito (chair), Simon Taylor, Beni Zihlmann
Review minutes from the meeting on June 14
Review of the minutes was done without significant comment.
Propagation Time Corrections
Mahmoud described a new method for obtaining the light propagation time corrections. This approach fits one-dimensional histograms of walk-corrected times where each histogram comes from a bin in z (actually, length along the counter). z-position is determined by charged particles.
For all of the details, please see Mahmoud's slides.
This method seems much more robust than the previously tried fits to a two-dimensional histogram. The details of the function used to smooth the bin-to-bin fluctuations in the correction is still being developed.
There was some discussion of whether the hits in the forward-most bin, where the exact geometry of the counters is uncertain, should ever be used in reconstruction. We did not come to a conclusion about this.
World Cup Re-Cap
Switzerland is through to the knock-out round. Egypt did not make it. The US is absent from this year's tournament on account of a heart-breaking loss to Trinidad & Tobago.
Time-dependent geometry adjustments
Sean reported that work will resume after the reconstruction launch lock-down is past.
Werner reported that Eric Pooser has been busy with software presentations lately and that work will resume soon.