Difference between revisions of "April 8, 2015 Calibration"

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# Subdetector Reports
 
# Subdetector Reports
 
## RF Signals (Paul) [https://logbooks.jlab.org/entry/3322743 Logbook Entry]
 
## RF Signals (Paul) [https://logbooks.jlab.org/entry/3322743 Logbook Entry]
 +
# Timing Updates
 +
#* TDC reconstruction (Paul) [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=2686 Mark, Kei Doc]
 +
#* CCDB updates (Mike S.)
 +
# [https://halldweb.jlab.org/wiki/index.php/March_25,_2015_Calibration#Proposed_Spring_Plans Spring Calibration Plans]
 +
#* Normalization Discussion
 +
 +
== Minutes ==
 +
 +
=== Subdetector Reports ===
 +
 +
* FCAL - Adesh has been working on trigger studies, and studying expectations for rates for the upcoming run.  He truncated the photon spectrum at 6 GeV, and estimated the the instantaneous rates to be ~30-40% of the fall running.  Higher beam currents and thicker radiators would be helpful for this running.
 +
* BCAL - No major improvements to report.  Tegan has been working on improving the simulation of dark hits in the BCAL simulation.  George from Athens is working on determining the effective velocities.
 +
* CDC - Beni has been working on trying to do an alignment with the cosmic data that's been taken over the past couple months.  This corresponds to much more data than before, ~100M events.  He is talking with Simon to optimize the processing of this data, since it's otherwise pretty slow.  He is also working on tuning the gas flow (apparently the mass flow controller does not like Argon).  Naomi is still working on the monitoring, but did find that when Beni turned off the alcohol bubbler the CDC gains when down ~20% and the maximum drift time increased by ~20 ns.
 +
* FDC - Lubomir has finished aligning each of the packages by themselves, and it working on aligning the packages with each other.  Simon is testing the implementation of these constants in sim-recon. Lubomir's alignment aligns the cathode strip planes with respect to the wire planes, and uses 48 parameters - 8 per cell - consisting offsets, rotations, and pitches.
 +
* TOF - Kei is working on looking at the timing offsets, and Beni has been looking at the effective speeds of light. Sean is looking at the TOF/track matching. Sasha O. has been supposed to add his preliminary constants from cosmic data, but has not done this yet.  Sean will continue to follow up on this.
 +
* Start Counter - No news/
 +
* TAGH - Nathan has been doing a lot of work with PS data.  He has been trying to calibrate the coarse PS TDC times by cross-correlating paddles in the different arms.  The offsets seem small (<1ns), and the resolution is ~250 ps. He has been using these PS calibrations to improve the hodoscope counter-by-counter calibrations. These calibrations limited by the PS energy range to a little below the microscope, and are statistically limited (esp. at lower photon energies). The resolutions obtained so far are ~250-400 ps.
 +
* TAGM - No news.
 +
 +
# RF Signals (Paul) [https://logbooks.jlab.org/entry/3322743 Logbook Entry]
 
# Timing Updates  
 
# Timing Updates  
 
#* TDC reconstruction (Paul) [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=2686 Mark, Kei Doc]
 
#* TDC reconstruction (Paul) [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=2686 Mark, Kei Doc]

Revision as of 14:42, 8 April 2015

GlueX Calibration Meeting
Wednesday, April 8, 2015
11:00 am, EDT
JLab: CEBAF Center, F326

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Agenda

  1. Announcements
  2. Subdetector Reports
    1. RF Signals (Paul) Logbook Entry
  3. Timing Updates
  4. Spring Calibration Plans
    • Normalization Discussion

Minutes

Subdetector Reports

  • FCAL - Adesh has been working on trigger studies, and studying expectations for rates for the upcoming run. He truncated the photon spectrum at 6 GeV, and estimated the the instantaneous rates to be ~30-40% of the fall running. Higher beam currents and thicker radiators would be helpful for this running.
  • BCAL - No major improvements to report. Tegan has been working on improving the simulation of dark hits in the BCAL simulation. George from Athens is working on determining the effective velocities.
  • CDC - Beni has been working on trying to do an alignment with the cosmic data that's been taken over the past couple months. This corresponds to much more data than before, ~100M events. He is talking with Simon to optimize the processing of this data, since it's otherwise pretty slow. He is also working on tuning the gas flow (apparently the mass flow controller does not like Argon). Naomi is still working on the monitoring, but did find that when Beni turned off the alcohol bubbler the CDC gains when down ~20% and the maximum drift time increased by ~20 ns.
  • FDC - Lubomir has finished aligning each of the packages by themselves, and it working on aligning the packages with each other. Simon is testing the implementation of these constants in sim-recon. Lubomir's alignment aligns the cathode strip planes with respect to the wire planes, and uses 48 parameters - 8 per cell - consisting offsets, rotations, and pitches.
  • TOF - Kei is working on looking at the timing offsets, and Beni has been looking at the effective speeds of light. Sean is looking at the TOF/track matching. Sasha O. has been supposed to add his preliminary constants from cosmic data, but has not done this yet. Sean will continue to follow up on this.
  • Start Counter - No news/
  • TAGH - Nathan has been doing a lot of work with PS data. He has been trying to calibrate the coarse PS TDC times by cross-correlating paddles in the different arms. The offsets seem small (<1ns), and the resolution is ~250 ps. He has been using these PS calibrations to improve the hodoscope counter-by-counter calibrations. These calibrations limited by the PS energy range to a little below the microscope, and are statistically limited (esp. at lower photon energies). The resolutions obtained so far are ~250-400 ps.
  • TAGM - No news.
  1. RF Signals (Paul) Logbook Entry
  2. Timing Updates
  3. Spring Calibration Plans
    • Normalization Discussion
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