Difference between revisions of "May 21, 2009 Readout"

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= Minutes =
 
= Minutes =
 +
Attending: Elton, Sasha, Tim, Eugene, Beni, George, Will, Irina, Andrei <br>
  
 
# Announcements
 
# Announcements
 
# Review of Action Items
 
# Review of Action Items
 +
#* Reviewed and updated.
 +
#* Shipment of Bcal wedge from Edmonton expected next week. After careful measurements of fiber pitch can make this available to Chile for prototype tests
 +
#* Beni has made an inventory of fibers at JLab. Will to decide how many are needed for prototyping and see if fibers purchased previous to first-articles can be used.
 +
#* Unclear precisely what items 3 and 4 were. Will will make a detailed plan for prototyping for feedback. George emphasized that using cosmics provides a useful testbed for understanding the energy deposition and can be used to cross check calculations.
 
# [http://www.jlab.org/Hall-D/software/wiki/images/c/c4/Report21May2009.pdf USM report (Will)]
 
# [http://www.jlab.org/Hall-D/software/wiki/images/c/c4/Report21May2009.pdf USM report (Will)]
−
# Keepout zones for light guides and magnetic shielding
+
#* Estimates of components to the resolution were presented and discussed.
 +
#* Threshold was discussed. Eugene pointed out that noise is important when considering the threshold.
 +
#* The floor term was discussed. Arises due to leakage, and calibration issues. There are differences that are expected between the prototype and the final detector. Eugene suggested that 2% is to be expected for a large number of channels. Non-uniformities and how well these can be calibrated plays a role in that term.
 +
#* Andrei: The 'a' term changes by about 20% between 90deg and 20deg according to simulations.
 
# Discussion of readout options
 
# Discussion of readout options
−
#* Time for internal review (end of June / beginning of July)?
+
#* Time for internal review (end of June / beginning of July)? Tentative date set for July 14.
 
#* Number of photons per GeV (Sasha and Elton)
 
#* Number of photons per GeV (Sasha and Elton)
 +
#** Elton presented a summary of numbers already documented.
 
#* Budget comparison (Elton)
 
#* Budget comparison (Elton)
 +
#** Table of budgets (from last fall) was shown. Eugene: The FM option is nominally 350k more expensive, but assumed $0.4k/SiPM. The balance changes is the SiPMs are 50% more expensive. Therefore, this option should still be considered seriously.
 +
#** A detailed accounting of both options needs to be redone.
 +
#** Will pointed out that the cooling of SiPMs is not yet included.
 +
#** Beni noted that the dynamic range might require a change in the channel count for electronics.
 
# Location of FM pmts relative to B-field  
 
# Location of FM pmts relative to B-field  
 +
# Keepout zones for light guides and magnetic shielding
 
# Prototyping
 
# Prototyping
 
# Simulations
 
# Simulations
 +
#* Sasha will send a link to studies of energy deposition in the Bcal and present his work next time.
 +
#* Andrei will complete simulations of number of visible photons per GeV.
 
# Discussions on MOU with USM
 
# Discussions on MOU with USM

Revision as of 16:59, 21 May 2009

Teleconference Time: 11:00 a.m. EST

  • EVO session
  • Phone:
    • +1-800-377-8846 : US
    • +1-888-276-7715 : Canada
    • +1-302-709-8424 : International
    • then enter participant code: 39527048# (remember the "#")

Items for followup from previous meeting

  1. Bcal section
    • Zisis will get a quote from Ross machining to find out how much it would cost to polish a segment (both ends)
  2. JLab to determine how many fibers could be spared now to use in this project .
  3. Elton: Feedback to Will on estimate of photons in Bcal . See halld-cal e-mail
  4. Will, update references on "alternative readout page" with those found by Zisis
  5. Zisis, Elton: Suggestion to USM on testing prototype
  6. USM: sketch of test setup to facilitate feedback

Documents to Review

  1. GlueX-doc-1279 Comments for bullets on agenda 5 and 6

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. USM report (Will)
  4. Keepout zones for light guides and magnetic shielding
  5. Discussion of readout options
    • Time for internal review (end of June / beginning of July)?
    • Number of photons per GeV (Sasha and Elton)
    • Budget comparison (Elton)
  6. Location of FM pmts relative to B-field
  7. Prototyping
  8. Simulations
  9. Discussions on MOU with USM

Minutes

Attending: Elton, Sasha, Tim, Eugene, Beni, George, Will, Irina, Andrei

  1. Announcements
  2. Review of Action Items
    • Reviewed and updated.
    • Shipment of Bcal wedge from Edmonton expected next week. After careful measurements of fiber pitch can make this available to Chile for prototype tests
    • Beni has made an inventory of fibers at JLab. Will to decide how many are needed for prototyping and see if fibers purchased previous to first-articles can be used.
    • Unclear precisely what items 3 and 4 were. Will will make a detailed plan for prototyping for feedback. George emphasized that using cosmics provides a useful testbed for understanding the energy deposition and can be used to cross check calculations.
  3. USM report (Will)
    • Estimates of components to the resolution were presented and discussed.
    • Threshold was discussed. Eugene pointed out that noise is important when considering the threshold.
    • The floor term was discussed. Arises due to leakage, and calibration issues. There are differences that are expected between the prototype and the final detector. Eugene suggested that 2% is to be expected for a large number of channels. Non-uniformities and how well these can be calibrated plays a role in that term.
    • Andrei: The 'a' term changes by about 20% between 90deg and 20deg according to simulations.
  4. Discussion of readout options
    • Time for internal review (end of June / beginning of July)? Tentative date set for July 14.
    • Number of photons per GeV (Sasha and Elton)
      • Elton presented a summary of numbers already documented.
    • Budget comparison (Elton)
      • Table of budgets (from last fall) was shown. Eugene: The FM option is nominally 350k more expensive, but assumed $0.4k/SiPM. The balance changes is the SiPMs are 50% more expensive. Therefore, this option should still be considered seriously.
      • A detailed accounting of both options needs to be redone.
      • Will pointed out that the cooling of SiPMs is not yet included.
      • Beni noted that the dynamic range might require a change in the channel count for electronics.
  5. Location of FM pmts relative to B-field
  6. Keepout zones for light guides and magnetic shielding
  7. Prototyping
  8. Simulations
    • Sasha will send a link to studies of energy deposition in the Bcal and present his work next time.
    • Andrei will complete simulations of number of visible photons per GeV.
  9. Discussions on MOU with USM
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