Difference between revisions of "May 29, 2012 Readout"

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(Tentative Agenda)
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##[[Media:ligthguide_update_1.pdf|Ligthguide Update]] (Iñaki)
 
##[[Media:ligthguide_update_1.pdf|Ligthguide Update]] (Iñaki)
 
# Status of Testing at JLab
 
# Status of Testing at JLab
## [https://halldweb1.jlab.org/elog-halld/SiPM/ Hall-D ELOG].
+
## [https://halldweb.jlab.org/elog-halld/SiPM/ Hall-D ELOG].
 
# [[BCAL Beam Tests 2012]]  
 
# [[BCAL Beam Tests 2012]]  
 
## [https://mailman.jlab.org/pipermail/halld-cal/2012-May/000588.html e-mail regarding amplification]
 
## [https://mailman.jlab.org/pipermail/halld-cal/2012-May/000588.html e-mail regarding amplification]
Line 43: Line 43:
  
 
= Minutes =
 
= Minutes =
''Attending:
+
''Attending: Elton, Beni, Dvid, Tim (Jlab); Zisis (UofR); Will, Serguei, Javiera, Iñaki, Orlando (USM); Christina, George, Stratos (Athens)
 +
 
 +
# Announcements
 +
# Review of Action Items
 +
# Update on monitoring (Athens)
 +
##  Elton gave a quick update on status of mini-Bcal and monitoring system
 +
##* Student will work with Elton and Dave this summer on this project. For the next two weeks, David will directly supervise the student and this activity
 +
##*  Zisis: Suggest that we give acceptance on the first article if signals are registered on both sides of the mini-Bcal and the intensity ratio is between 2-4.
 +
##* We should also check the impact of pulsing the LEDs on adjacent SiPMs.
 +
## Operation
 +
##* Bias for LEDs can range +8 V to + 20 V.
 +
##* At a repetition rate of 1 KHz and a bias of 10-11 V, the blue LED light should be visible.
 +
## Updates to board
 +
##* Add 5 cm of length to the flexible cable coming from the Bcal LED boards
 +
##* Move the input connector to the center of the board (as described in an separate e-mail from Elton). The move to the center of the board is essential to uncover the bolt holes. Rotating the connector 90 deg and finding a connector which can plug in horizontally would also be beneficial.
 +
## Installation after light guide gluing
 +
##* Due to schedule constraints, we will investigate the options for installing the monitoring system after the light guides are glued. We currently expect the first 17 sets of light guides at the beginning of July.
 +
##* If the first article is approved next week, we can expect the first tested LED boards at the end of August.
 +
# Update from USM
 +
## [[Media:USMReport16.pdf|SiPM Update]] (Javiera)
 +
##* Three shipments of SiPMs have been received from Hamamatsu. The fourth shipment has been requested but not yet scheduled
 +
##* The first shipment of tested SiPMs was shipped May 24th, and expected to arrive at JLab on May 30.
 +
##* The power supply for the CAEN mainframe that provides bias in stage 3 has failed. A replacement has been ordered from CAEN but will take about a week.
 +
##[[Media:ligthguide_update_1.pdf|Ligthguide Update]] (Iñaki)
 +
##* Overview of polishing machine and materials presented
 +
##* Three techs currently working. Two on production, the third developing methods
 +
##* Dimensions are checked after machining. First with caliper, then profile projector and finally with JLab gauge. About 15 microns of material are removed through polishing.
 +
##* Zisis: Regina has requested some light guides for testing. (See [https://mailman.jlab.org/pipermail/halld-cal/2012-May/000590.html e-mail communication]). Desired schedule is mid July, but this production should not interfere with production of light guides.
 +
# Status of Testing at JLab
 +
## [https://halldweb.jlab.org/elog-halld/SiPM/ Hall-D ELOG].
 +
# [[BCAL Beam Tests 2012]]
 +
## [https://mailman.jlab.org/pipermail/halld-cal/2012-May/000588.html e-mail regarding amplification]
 +
## Decision on configuration for electronic boards for the next iteration. Note that gain adjustments can be made after the boards are stuffed
 +
## All feedback from the beamtest is going into the new iteration of boards including wider ground traces, adjustments for the extraction of heat from the chips on the board, and simplification of assembly.
 +
## Bias configuration. We will make two mirror versions of the board, one for upstream and the other for downstream. We call this the mirror configuration, where bias 1 on the upstream feeds the opposite SiPMs and bias 1 downstream. Andrei suggested that one more bias be added to the board to allow entire rows to be powered at one time. Due to the increase cost in power supplies and design effort to change the board, we will go with the mirror solution. Note that this configuration will require more data to be collected when single cells are powered
 +
## Gain of pre-amplifier. Elton suggested to set the nominal bias to Vover=1.2 V. With this configuration, the electronic gain is to be reduced by a factor of 2.5.
 +
## Keep the latest TDC gain of x5 relative to the fADC gain.
 +
## Zisis has a list of homework tasks to be worked on while the boards are manufactured and stuffed (about 3 weeks). Changes to the amplification gain can be made after the boards are stuffed if necessary.
 +
# Other

Latest revision as of 23:59, 31 March 2015

Teleconference Time: 11:00 a.m. EST

  • ESNET (Number is 8542553) and EVO session (GlueX Calorimetry meeting room)
  • Phone connection only upon request.
    • +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)

Participant Direct Lines

  • 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
  • Athens Phone: in Christina's office is 011-30-210-727-6947

Items for followup from previous meeting

  1. SiPMs
    • Plot dark rate of SiPM measurements extrapolated to 25deg C as for Hamamatsu data (Orlando and Serguei)

Presentations from recent meetings

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. Update on monitoring (Athens)
  4. Update from USM
    1. SiPM Update (Javiera)
    2. Ligthguide Update (Iñaki)
  5. Status of Testing at JLab
    1. Hall-D ELOG.
  6. BCAL Beam Tests 2012
    1. e-mail regarding amplification
    2. Decision on configuration for electronic boards for the next iteration. Note that gain adjustments can be made after the boards are stuffed
    3. All feedback from the beamtest is going into the new iteration of boards including wider ground traces, adjustments for the extraction of heat from the chips on the board, and simplification of assembly.
    4. Bias configuration. We will make two mirror versions of the board, one for upstream and the other for downstream. We call this the mirror configuration, where bias 1 on the upstream feeds the opposite SiPMs and bias 1 downstream. Andrei suggested that one more bias be added to the board to allow entire rows to be powered at one time. Due to the increase cost in power supplies and design effort to change the board, we will go with the mirror solution. Note that this configuration will require more data to be collected when single cells are powered
    5. Gain of pre-amplifier. Elton suggested to set the nominal bias to Vover=1.2 V. With this configuration, the electronic gain is to be reduced by a factor of 2.5.
    6. Keep the latest TDC gain of x5 relative to the fADC gain.
    7. Zisis has a list of homework tasks to be worked on while the boards are manufactured and stuffed (about 3 weeks). Changes to the amplification gain can be made after the boards are stuffed if necessary.
  7. Other

Minutes

Attending: Elton, Beni, Dvid, Tim (Jlab); Zisis (UofR); Will, Serguei, Javiera, Iñaki, Orlando (USM); Christina, George, Stratos (Athens)

  1. Announcements
  2. Review of Action Items
  3. Update on monitoring (Athens)
    1. Elton gave a quick update on status of mini-Bcal and monitoring system
      • Student will work with Elton and Dave this summer on this project. For the next two weeks, David will directly supervise the student and this activity
      • Zisis: Suggest that we give acceptance on the first article if signals are registered on both sides of the mini-Bcal and the intensity ratio is between 2-4.
      • We should also check the impact of pulsing the LEDs on adjacent SiPMs.
    2. Operation
      • Bias for LEDs can range +8 V to + 20 V.
      • At a repetition rate of 1 KHz and a bias of 10-11 V, the blue LED light should be visible.
    3. Updates to board
      • Add 5 cm of length to the flexible cable coming from the Bcal LED boards
      • Move the input connector to the center of the board (as described in an separate e-mail from Elton). The move to the center of the board is essential to uncover the bolt holes. Rotating the connector 90 deg and finding a connector which can plug in horizontally would also be beneficial.
    4. Installation after light guide gluing
      • Due to schedule constraints, we will investigate the options for installing the monitoring system after the light guides are glued. We currently expect the first 17 sets of light guides at the beginning of July.
      • If the first article is approved next week, we can expect the first tested LED boards at the end of August.
  4. Update from USM
    1. SiPM Update (Javiera)
      • Three shipments of SiPMs have been received from Hamamatsu. The fourth shipment has been requested but not yet scheduled
      • The first shipment of tested SiPMs was shipped May 24th, and expected to arrive at JLab on May 30.
      • The power supply for the CAEN mainframe that provides bias in stage 3 has failed. A replacement has been ordered from CAEN but will take about a week.
    2. Ligthguide Update (Iñaki)
      • Overview of polishing machine and materials presented
      • Three techs currently working. Two on production, the third developing methods
      • Dimensions are checked after machining. First with caliper, then profile projector and finally with JLab gauge. About 15 microns of material are removed through polishing.
      • Zisis: Regina has requested some light guides for testing. (See e-mail communication). Desired schedule is mid July, but this production should not interfere with production of light guides.
  5. Status of Testing at JLab
    1. Hall-D ELOG.
  6. BCAL Beam Tests 2012
    1. e-mail regarding amplification
    2. Decision on configuration for electronic boards for the next iteration. Note that gain adjustments can be made after the boards are stuffed
    3. All feedback from the beamtest is going into the new iteration of boards including wider ground traces, adjustments for the extraction of heat from the chips on the board, and simplification of assembly.
    4. Bias configuration. We will make two mirror versions of the board, one for upstream and the other for downstream. We call this the mirror configuration, where bias 1 on the upstream feeds the opposite SiPMs and bias 1 downstream. Andrei suggested that one more bias be added to the board to allow entire rows to be powered at one time. Due to the increase cost in power supplies and design effort to change the board, we will go with the mirror solution. Note that this configuration will require more data to be collected when single cells are powered
    5. Gain of pre-amplifier. Elton suggested to set the nominal bias to Vover=1.2 V. With this configuration, the electronic gain is to be reduced by a factor of 2.5.
    6. Keep the latest TDC gain of x5 relative to the fADC gain.
    7. Zisis has a list of homework tasks to be worked on while the boards are manufactured and stuffed (about 3 weeks). Changes to the amplification gain can be made after the boards are stuffed if necessary.
  7. Other