Difference between revisions of "Mar 29, 2011 Calorimetry"

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## First article testing (Yi)
 
## First article testing (Yi)
 
##* Completed testing 40 units
 
##* Completed testing 40 units
−
##* Checked calibration of QDC. Gain of samples is about 6x10^5 instead of 7.5^10^5, expected from nominal Hamamatsu voltages
+
##* Checked calibration of QDC. Gain of samples is about 6x10^5 instead of 7.5^10^5, expected for nominal Hamamatsu voltages.
−
##*  
+
##* Measured the gain vs voltage for normalization
 +
##* For increased gain, the dark rates increase by about 30-40%, still below the rates from the original samples
 +
##* Results are being updated with calibrated gains.
 +
##* Tim: Check the apparatus with early samples to qualify test setup.
 +
##* After verifying that all checks have been completed, send 10 units to UofR and 10 to USM.
 +
##* Proceed with radiation tests of several samples to check response compared to previous samples.
 
# [http://www.jlab.org/~semenov/meeting110329.pdf Simulations]
 
# [http://www.jlab.org/~semenov/meeting110329.pdf Simulations]
 +
#* Studied angular resolution, assuming known vertex (center of target)
 +
#* Reconstructed theta angle for summed configuration about 2x worse than for fine segmentation
 +
#* Reconstructed phi angle about the same for both summed and fine segmentations
 +
#* Beni: How is the timing determined for summed configuration? Matt: times are energy weighted averages of the time of individual cells
 +
#* Matt: Noted that recent discussions on listservers noted that the function of the primary flag has changed. Does not think it would change results, but should be verified
 +
#* Eugene: At 90deg the timing of both situations should be very similar, but are not. Suggest checking this configuration, and once understood, moving to other cases
 +
#* Elton: Asked whether the efficiency of reconstruction has been investigated. Andrei: not yet
 +
#* Matt: On the efficiency of reconstruction: Mihajlo studied this effect when the FDC design was being finalized. These results could be used as a reference. Of course, no study involving summing has been done yet.
 +
#* Andrei: Careful control of software versions should be considered and documented, and extended to the use of flags. Studies should attempt to use tagged versions only.
 +
#* Matt: It is possible to a revision number for any checkout from the repository as a tag, although tagged releases are in fact preferable.

Revision as of 13:49, 29 March 2011

Teleconference Time: 11:00 a.m. EST

  • ESNET (Number is 8542553) and EVO session (GlueX Calorimetry meeting room)
  • JLab Phone: in CC F326 is 757-269-6337
  • Regina Phone: in LB228 is 306-585-4204
  • Athens Phone: in Christina's office is 011-30-210-727-6947
  • Phone connection only upon request.
    • +1-866-740-1260 : US+Canada
    • +1-303-248-0285 : International
    • then enter participant code: 3421244# (remember the "#").
    • or www.readytalk.com (and code without the #)

Items for followup from previous meeting(s)

  1. Monitoring
    • Fcal: check cross talk of calibration inputs across modules.
  2. Simulation
      • Need to study the reconstruction efficiency.
      • Andrei will send David instructions for using summing and configuration files.

Tentative Agenda

  1. Announcements
    • Starting this week, we will move the Bcal Readout meeting and Cal Working Group meetings to TUESDAY 11:00
  2. Review of Action Items
  3. Calibration
  4. FCAL
    1. Construction Status: mechanical, bases
    2. Drawings for Fcal structure (Tim)
  5. BCAL
    1. Construction Status: builds, fibre QA
    2. First article testing (Yi)
  6. Simulations

Minutes

Attending: Beni, Elton, John, Eugene, Tim, Lubomir, Yi (JLab); Will, Serguei (USM); Matt (IU); Zisis, Andrei (UofR).

  1. Announcements
    • Starting this week, we will move the Bcal Readout meeting and Cal Working Group meetings to TUESDAY 11:00
  2. Review of Action Items
  3. Calibration
  4. FCAL
    1. Construction Status: mechanical, bases
      • John and Steve have completed wrapping blocks. Shipment expected about April 18.
      • Bases Status; Only 5 non-operational out of 500. 2 have a low clock speed creating difficulties communicating with CAN bus.
      • 400 bases connected to CAN bus and operating smoothly
      • Investigating what is poor assembly in preparation for order of 2500 remaining bases
      • Company that built the 500 is increasing rates for the next 2500. IU is investigating options for bidding the large order, including possibly changing vendors.
      • Discussions are ongoing related to CAN interface to slow control system
    2. Drawings for Fcal structure (Tim) Sketches for comments on FCAL structure
      • Discussions on mechanical design completed with Tim and Wayne.
      • Prototype under construction to validate the design.
      • The beefed up structure, which allows the structure to be lifted whole, will be incorporated into the John's drawing package
  5. BCAL
    1. Construction Status: builds, fibre QA
      • Production all normal.
      • Shipment of fibers arrived last week
      • Modules 33-34 will be completed next week
      • Machining of modules 24-28 proceeding well. Expect shipping to JLab second week of April, with 8th shipment following 2 weeks later.
    2. First article testing (Yi)
      • Completed testing 40 units
      • Checked calibration of QDC. Gain of samples is about 6x10^5 instead of 7.5^10^5, expected for nominal Hamamatsu voltages.
      • Measured the gain vs voltage for normalization
      • For increased gain, the dark rates increase by about 30-40%, still below the rates from the original samples
      • Results are being updated with calibrated gains.
      • Tim: Check the apparatus with early samples to qualify test setup.
      • After verifying that all checks have been completed, send 10 units to UofR and 10 to USM.
      • Proceed with radiation tests of several samples to check response compared to previous samples.
  6. Simulations
    • Studied angular resolution, assuming known vertex (center of target)
    • Reconstructed theta angle for summed configuration about 2x worse than for fine segmentation
    • Reconstructed phi angle about the same for both summed and fine segmentations
    • Beni: How is the timing determined for summed configuration? Matt: times are energy weighted averages of the time of individual cells
    • Matt: Noted that recent discussions on listservers noted that the function of the primary flag has changed. Does not think it would change results, but should be verified
    • Eugene: At 90deg the timing of both situations should be very similar, but are not. Suggest checking this configuration, and once understood, moving to other cases
    • Elton: Asked whether the efficiency of reconstruction has been investigated. Andrei: not yet
    • Matt: On the efficiency of reconstruction: Mihajlo studied this effect when the FDC design was being finalized. These results could be used as a reference. Of course, no study involving summing has been done yet.
    • Andrei: Careful control of software versions should be considered and documented, and extended to the use of flags. Studies should attempt to use tagged versions only.
    • Matt: It is possible to a revision number for any checkout from the repository as a tag, although tagged releases are in fact preferable.
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