Difference between revisions of "Mar 22, 2011 Readout"

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'''<font color=red>Teleconference Time: 10:30 a.m. EST</font>'''  
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'''<font color=red>Teleconference Time: 11:00 a.m. EST</font>'''  
  
 
* ESNET 8542553 and EVO session
 
* ESNET 8542553 and EVO session
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=Items for followup from previous meeting=
 
=Items for followup from previous meeting=
  
−
# Zisis will send the Regina light guide requirements to Will.
+
# <strike> Zisis will send the Regina light guide requirements to Will. </strike>
  
 
= Documents to Review=
 
= Documents to Review=
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# Announcements
 
# Announcements
 
# Review of Action Items
 
# Review of Action Items
−
# Time of meeting
 
 
# USM update
 
# USM update
−
# SiPM update
 
−
## First Article testing
 
 
# Simulations  
 
# Simulations  
−
# Electronics/cooling
+
# [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1715 Electrical/cooling] (Elton)
 
# Geometry and light guides
 
# Geometry and light guides
 +
# SiPM update
 +
## First Article testing [http://www.jlab.org/~yqiang/halld/SiPM/first_article/Update_20110322.pptx Update]
  
 
= Minutes =
 
= Minutes =
−
''Attending:Zisis, Andrei (UofR); Elton, Eugene, Beni (JLab); Will (USM).
+
''Attending: Christina, George, Pavlos, Kappos (Athens); Elton, Beni, Tim, Eugene, Yi, John, Beni; Zisis, Andrei (UofR); Will, Serguei (USM)
  
 
# Announcements
 
# Announcements
−
#* First article SiPM samples (80) arrived yesterday.
+
#* Will have a meeting on monitoring on Thu at 11:00, same venue
 
# Review of Action Items
 
# Review of Action Items
−
# Time of meeting
+
# Monitoring (Christina)
−
#* Decided to move the time to 11:00 am. Poll group if Bcal and Cal Working meetings could be moved to Tuesday.
+
## Discussions in Athens have clarified some questions regarding the proposed monitoring system
 +
##* The daisy chain scheme will not work unless the transistor (low impedance) is replaced by a mosfet (can be made into high impedance) without loss of performance
 +
##* Discussion about implementing the star arrangement. This could include placing the control board inside the Bcal readout housing. This board would be supplied with a few cables for communication, power and trigger. 20-40 cables to the LED boards would be distributed within the housing box
 +
## Questions to be answered include:
 +
##* Space inside the housing box for the control board
 +
##* Space between the light guides to place the LED boards
 +
## Note: Baby cal has now been released from customs (it only took about 3 months)
 
# USM update
 
# USM update
−
## Completing response to JLab solicitation for testing SiPMs
+
## Waiting for main prototype boards (expect toward the end of the month)
−
##* Developing solutions to handle advance payments to Hamamatsu
+
## Alam is designing a NIM module for (slow) control of the multiplexors that distribute the signals inside the test box
−
##* On the technical side: We need to carefully consider how to handle the temperature dependence of specifications. Hamamatsu is testing at room temperature. We are mainly interested of the performance at 5 deg, where we expect to operate. If there are systematic differences due to the temperature we will have to decide how to compare the differences
+
## Implementation of the slow control software underway
−
## Sent out large electronic boards for fabrication. It is a 6-layer board and 2 out of 8 required have been ordered. Expect delivery in about 3 weeks.
+
## New board for testing a single SiPM should be received soon  
−
## Dark box now insulated and black coating inside to reduce temperature changes due radiation
+
## SiPM from JLab is in customs and awaiting paperwork to be released
−
## This box provides a single uniform light source to all 32 SiPMs under test. A second station is under construction that illuminates individual arrays via fibers.
+
## Estimates for light guide production (unpolished): Athens (Apr 1); UofR (Apr 7); Jlab (May 1);
−
## Testing is accomplished using 2 CAEN V792 QDCs (2x32 channels).
+
# Simulations
−
##* 512 cells tested at one time (32 arrays x 16 cells) by multiplexing and using multi-event capability of QDC
+
# [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1715 Electrical/cooling] (Elton)
−
##* Analog multiplexors controlled using micro-processors in a slow control loop. Multiplexors developed commercially and used in  Gigabit analog signal processing.
+
#* Presented a summary of work at JLab
−
# SiPM update
+
#* Will: Cautioned about gas tightness (and light tightness) of connectors
−
## Test setup for first article testing is ready
+
#* Eugene: Raised the concern about the connections for cooling fluid affecting particles at the end of the Bcal. We need to see if tubes can be bent radially outward
−
## Samples have arrived and testing will start soon.
+
#* Need to get a firm number for the power dissipation in the monitoring control board (in case it  is placed inside the housing box)
−
# Simulations
+
−
## Andrei and Irina have had a setback due to changes in the software environment at IU, which is incompatible with previous versions used to obtain Bcal resolutions
+
−
##* Have decided to rerun previous simulations to ensure compatibility with new configurations
+
−
##* Hope to be able to report on new results next week
+
−
##* Will get on the agenda for the next software meeting to discuss issues of code stability.
+
−
## Mijahlo has started looking at the Bcal code to study differences between electromagnetic and hadronic showers.
+
−
##* Investigating how the code can be used to easily access time/energy/position variables during shower reconstruction
+
−
##* Dave has posted a note on the portal [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1710 GlueX-doc-1710] documenting the status of shower split-offs.
+
−
# Electronics/cooling
+
−
#* JLab has an advanced concept for mechanical cooling and the electronic boards for the readout. Will report at the next Bcal readout meeting. [[SiPM electrical and cooling]] weekly meetings at JLab to review progress are ongoing.
+
 
# Geometry and light guides
 
# Geometry and light guides
−
#* No update
+
# SiPM First Article testing [http://www.jlab.org/~yqiang/halld/SiPM/first_article/Update_20110322.pptx Update]
 +
#* 20 of 40 units have been tested. Preliminary results show performance exceeds specifications and uniformity is very good.

Latest revision as of 17:12, 24 February 2017

Teleconference Time: 11:00 a.m. EST

  • ESNET 8542553 and EVO session
  • JLab Phone: in CC F326 is 757-269-6337 (usual room)
  • JLab Phone in CC L207 is 757-269-7084
  • Phone in the Regina Videoconference Suite is 306-585-4204
  • Phone:
    • +1-866-740-1260 : US and Canada
    • +1-303-248-0285 : International
    • then use participant code: 3421244# (the # is needed when using the phone)
    • OR from www.readytalk.com type access code 3421244 into "join a meeting" without the # (you need java plugin)

Items for followup from previous meeting

  1. Zisis will send the Regina light guide requirements to Will.

Documents to Review

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. USM update
  4. Simulations
  5. Electrical/cooling (Elton)
  6. Geometry and light guides
  7. SiPM update
    1. First Article testing Update

Minutes

Attending: Christina, George, Pavlos, Kappos (Athens); Elton, Beni, Tim, Eugene, Yi, John, Beni; Zisis, Andrei (UofR); Will, Serguei (USM)

  1. Announcements
    • Will have a meeting on monitoring on Thu at 11:00, same venue
  2. Review of Action Items
  3. Monitoring (Christina)
    1. Discussions in Athens have clarified some questions regarding the proposed monitoring system
      • The daisy chain scheme will not work unless the transistor (low impedance) is replaced by a mosfet (can be made into high impedance) without loss of performance
      • Discussion about implementing the star arrangement. This could include placing the control board inside the Bcal readout housing. This board would be supplied with a few cables for communication, power and trigger. 20-40 cables to the LED boards would be distributed within the housing box
    2. Questions to be answered include:
      • Space inside the housing box for the control board
      • Space between the light guides to place the LED boards
    3. Note: Baby cal has now been released from customs (it only took about 3 months)
  4. USM update
    1. Waiting for main prototype boards (expect toward the end of the month)
    2. Alam is designing a NIM module for (slow) control of the multiplexors that distribute the signals inside the test box
    3. Implementation of the slow control software underway
    4. New board for testing a single SiPM should be received soon
    5. SiPM from JLab is in customs and awaiting paperwork to be released
    6. Estimates for light guide production (unpolished): Athens (Apr 1); UofR (Apr 7); Jlab (May 1);
  5. Simulations
  6. Electrical/cooling (Elton)
    • Presented a summary of work at JLab
    • Will: Cautioned about gas tightness (and light tightness) of connectors
    • Eugene: Raised the concern about the connections for cooling fluid affecting particles at the end of the Bcal. We need to see if tubes can be bent radially outward
    • Need to get a firm number for the power dissipation in the monitoring control board (in case it is placed inside the housing box)
  7. Geometry and light guides
  8. SiPM First Article testing Update
    • 20 of 40 units have been tested. Preliminary results show performance exceeds specifications and uniformity is very good.
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