Jan 16, 2015 Calorimetry

From GlueXWiki
Revision as of 17:12, 24 February 2017 by Marki (Talk | contribs) (Text replacement - "http://argus.phys.uregina.ca/cgi-bin/private" to "https://halldweb.jlab.org/doc-private")

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Video Conferencing Information

Meeting Time: 1 p.m.

  1. To join via a Web Browser, go to the page [1] https://bluejeans.com/907185247.
  2. To join via Polycom room system go to the IP Address: (bjn.vc) and enter the meeting ID: 907185247.
  3. To join via phone, use one of the following numbers and the Conference ID: 907185247.
    • US or Canada: +1 408 740 7256 or
    • US or Canada: +1 888 240 2560
  4. Upon connection all microphones are automatically muted. To unmute your mike on a Polycom or equivalent unit, enter *4. Unmuting on a computer is trivial as there is a microphone button than can be clicked.
  5. More information on connecting to bluejeans is available.

Participant Direct Lines

  • JLab Phone: in CC F326 is 757-269-6460 (usual room)
  • JLab Phone in CC L207 is 757-269-7084
  • Phone in the Regina Video-conference Suite is 306-585-4204
  • Athens Phone: in Christina's office is 011-30-210-727-6947

Action Items

  1. FCAL VESDA system. Communicate with Dave Kausch (Elton, Manuel) Work is under way.
  2. FCAL Pulser electronics. Fix VME hardware and remove NIM electronics (Elton, Manuel, Adesh) Elton sent a communication to Orlando
  3. BCAL Fixes during down time (TDC, humidity) TDC and ADC should be fixed. Humidity issues are being investigated by Nick.


Tentative Agenda

  1. Announcements
  2. Collaboration Meeting February 19-21 at Jefferson Lab.
  3. Action Items
  4. FCAL HDFCAL log book
    • Noise in the FCAL: what to do for spring run; what to do long term?
  5. BCAL HDBCAL log book
  6. Reconstruction and Simulation
  7. Calibration
  8. Any other business


Attendees: Elton, Will, Manuel, Adesh (JLab); Matt (IU); Zisis, Tegan, Andrei (UofR).

  1. Announcements
  2. Collaboration Meeting February 19-21 at Jefferson Lab.
    • Decided that two 45 talks (FCAL, BCAL) should be scheduled [done]
  3. Action Items
  4. FCAL HDFCAL log book
    1. Noise in the FCAL: what to do for spring run; what to do long term?
      • Matt: for spring run - study how global threshold, sum windows affect trigger. Characterize noise and optimize settings.
      • Include negative fluctuations into the trigger sums (at the moment they are truncated below pedestal)
      • There does not seem to be any direct effect on analysis, problems are mostly in the trigger.
      • A small study group will be meeting starting on Tuesday.
      • Long term: Changes to the bases is a very large effort and should only be considered after all other options are exhausted.
    2. Log Book Entry 3317325 (Manuel)
      • Manuel has produced a document detailing issues encountered with the FCAL during the fall run.
      • Various problems with 2-3% of the bases occurred during the run. Manuel has cataloged the problems.
      • Many of the symptoms have been seen before, and many fixed before the run began. However, they have resurfaced again, usually in other bases.
      • Problems have been characterized and reproduced on the bench at IU. Paul Smith is investigating the root causes.
  5. BCAL HDBCAL log book
    1. Effect of Reflections GlueX-doc-2622
      • Elton went over the document, which describes a simple model for reflection pulses in the BCAL
      • Reflections with a coefficient of 10% seems to reproduced the observed peak/integral ratio in the data.
      • The same level of reflections riding on direct pulse collection increases the measured attenuation length in the modules from about 440 to 480 cm. The observed attenuation of about 520 cm (on average) is still somewhat higher than expected, but the discrepancy between expectation and measurements is reduced.
    2. BCAL_pi0_sample_statistics
      • Will has run over almost all the data for the fall run and included in the plots. Comparisons with other run lists is in progress, but will probably not change statistics substatially.
      • The number of pi0s with Eg>0.25 GeV is about 40k. This number decreases to about 1k for Eg>1 GeV.
      • Typical number of cells in each shower is 6-7. With Eg>0.25 GeV, the total number of cells fired is about 400k. We have about 800 cells, so about 400 counts per cell if evenly distributed.
      • Next steps are to collect data into a program that can determine the gains of each cell by minimizing the pi0 width.
    3. Pedestals
      • Tegan has procedures in place to understand the behavior of pedestals as a function of time through the run period
      • He will work with Will and Mark to access all data files and summarize their time behavior.
  6. Reconstruction and Simulation
  7. Calibration
  8. Any other business
    • Elton will be absent from the next meeting. Zisis will run the meeting.