Difference between revisions of "Apr 29, 2010 Calorimetry"

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# Monitoring: the Athens board was made to work in Regina, following the replacement of the LED.  A healthy 1 V pulse was seen in a calibrated Hamamatsu PMT at 1640 V, with the LED operating just a bit above its threshold and positioned 1.5cm from the photocathode.  The original LED was retested on the bench and was found to work.  It has a higher threshold (3.2V vs 2.7V for the replacement) and may have had a bad connection.  The board fires at 62kHz. Next steps are to mount the LED on the Construction Prototype and detect its light in a two-sided readout setup.
 
# Monitoring: the Athens board was made to work in Regina, following the replacement of the LED.  A healthy 1 V pulse was seen in a calibrated Hamamatsu PMT at 1640 V, with the LED operating just a bit above its threshold and positioned 1.5cm from the photocathode.  The original LED was retested on the bench and was found to work.  It has a higher threshold (3.2V vs 2.7V for the replacement) and may have had a bad connection.  The board fires at 62kHz. Next steps are to mount the LED on the Construction Prototype and detect its light in a two-sided readout setup.
 
# FCAL
 
# FCAL
−
# BCAL
+
# BCAL Construction Status:
−
## Construction Status:
+
 
### Modules 1-4 arrived at JLab on April 26; they were inspected and found in good condition.  Module 1 was painted with black chalkboard paint, but it had been decided not to paint the remainder modules to ensure that no chemical vapours from the paint would affect the end faces during their long storage in crates.
 
### Modules 1-4 arrived at JLab on April 26; they were inspected and found in good condition.  Module 1 was painted with black chalkboard paint, but it had been decided not to paint the remainder modules to ensure that no chemical vapours from the paint would affect the end faces during their long storage in crates.
 
### Procedural changes for swaging and layup are being documented and will be signed off.
 
### Procedural changes for swaging and layup are being documented and will be signed off.

Revision as of 01:31, 30 April 2010

Teleconference Time: 11:00 a.m. EDT

  • ESNET and EVO session
  • Phone in CC F326 is 757-269-6337
  • Phone in the Regina Videoconference Suite is 306-585-4204
  • Phone only if requested:
    • +1-800-377-8846 : US
    • +1-888-276-7715 : Canada
    • +1-302-709-8424 : International
    • then enter participant code: 77438230# (remember the "#"). Phone line by request only.

Items for followup from previous meeting(s)

  1. Monitoring
    • Bcal: Testing to see if LED sources can be viewed by pmts on both sides of the module (UofR).
  2. Fcal
    • Draft agenda for Readiness Review (Elton and Matt)
    • Decision on rad hard detectors
  3. Bcal
    • Send copy of contract with Ross to JLab
    • Report on beam test data at small incidence angles.

Table of Options DRAFT

Configurations for Fcal calorimter insert, assume sigma_E/E = c1/sqrt(E) + c2 + c3/E, and sigma_x = q1/sqrt(E) + q2 + q3/E
Configuration Block Size (mm2) Length(MM) X0 (mm) Sum X0 Moliere Radius (mm) Delta SC (mm) Delta Pb (mm) c1 c2 c3 q1 q2 q3
Pb glass F8-00 40x40 450 31 14.5 43 - - 5.0 2.0 0 6.4 0 0
Pb glass F108 40x40 450 31? 14.5 - - 6.0 2.4 0 6.4 0 0
Shashlyk COMPASS 38x38 450 (388) 15.6 25 1.5 0.75 4.8-6.6 0.1-1 0 5.0 0.1 0
Shashlyk PANDA 110x110 675 34 20 59 1.5 0.275 2.8 1.3 0 15.4 3.1 0
Shashlyk KOPIO PMT 110x110 525 37 14.3 1.5 0.25 3.59 1.1 0.9 15.4? 3.1? 0
Shashlyk KOPIO APD 110x110 525 37 14.3 1.5 0.25 2.77 1.7 0.27 15.4? 3.1? 0
PbWO4 PRIMEX 20.5x20.5 180 8.9 20 21.9 - - 2.6 - - 3.2? 0 0

See Property Table from Eugene

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. Calibration/Monitoring
  4. FCAL
    1. Construction status
    2. Readiness Review
    3. To shashlyk or not to shashlyk. Options (Elton) see Table. Physics Impact, see GlueX-doc-1481
  5. BCAL
    1. Construction Status
  6. Simulations
  7. GlueX-Collaboration-May-2010
  8. Other Updates

Minutes

Attendees:

  1. Monitoring: the Athens board was made to work in Regina, following the replacement of the LED. A healthy 1 V pulse was seen in a calibrated Hamamatsu PMT at 1640 V, with the LED operating just a bit above its threshold and positioned 1.5cm from the photocathode. The original LED was retested on the bench and was found to work. It has a higher threshold (3.2V vs 2.7V for the replacement) and may have had a bad connection. The board fires at 62kHz. Next steps are to mount the LED on the Construction Prototype and detect its light in a two-sided readout setup.
  2. FCAL
  3. BCAL Construction Status:
      1. Modules 1-4 arrived at JLab on April 26; they were inspected and found in good condition. Module 1 was painted with black chalkboard paint, but it had been decided not to paint the remainder modules to ensure that no chemical vapours from the paint would affect the end faces during their long storage in crates.
      2. Procedural changes for swaging and layup are being documented and will be signed off.
      3. Modules 5 and 6 are at RMS awaiting machining
      4. Module 7 was completed and crated, and the top plate on Module 8 was going on today. The will be shipped to RMS on Monday and all four will go in the machine queue (about two weeks before machining starts). Delivery to Jlab mid to end of June.
      5. Modules 9 and 10 go on the presses within the next few days.
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