Sep 25, 2012 Calorimetry

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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+Canada
    • +1-303-248-0285 : International
    • then enter participant code: 3421244# (remember the "#").
    • or www.readytalk.com (and code without the #)

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(s)

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. Talks at the Collaboration Meeting
  4. Monitoring
  5. FCAL
    1. Construction Status
    2. Darkroom Images
  6. USM update
    1. SiPM Update (Javiera)
  7. BCAL
    1. SiPM Update (Shaun): Updated slides Media:SiPMpresentationV2.pdf
  8. TDR update
    1. Instructions for the TDR (You must be logged into the wiki to access this page).
    2. See Feb 14, 2012 Calorimetry Meeting
  9. Calibration of Calorimeters
  10. Simulations/Reconstruction: Status of Sample Fraction Study (Andrei)
  11. Any other business

Minutes

Attendees: Dan, Manuel, Elton, David, Tim, Beni, Yi, John, Eugene (JLab); Shaun, Zisis, Andrei (UofR); Christina, George, Stratos (Athens); Matt (IU); Javiera, Alam, Francisco, Serguei (USM).

  1. Announcements
  2. Review of Action Items
  3. Talks at the Collaboration Meeting
    • Stratos to give the monitoring talk and Hayk to give the update from USM.
  4. Monitoring
    • Continue to test boards, reported on 1000 tested last meeting.
    • Zisis had requested a schedule for delivery. The boards will continue to the tested and all shipped at one time. This should be in time to install at the time of light guide gluing.
    • Received some faulty flexible cables. Thirty have been ordered as replacements (at 3x initial cost)
  5. FCAL
    1. Construction Status
    2. Darkroom Images
      • Inner Al parts are all set
      • Detailing dark room design based on John's concept and the 3D model
      • New concept for hinged doors, interlocked to the pmt HV. There are now two doors with a landing in between, gives more space than before.
      • Mounting scheme for plexiglass completed. The four sheets are not quite identical due to mounting constraints
      • Cover in front of array is 2x1/16" flame retardant ABS plastic. Elton: Is there a beam hole? No, but one will be added
      • Added gap around plexiglass to allow connector insertions
      • Concept for making system light tight is almost complete. Proposal to do this at IU before shipping frame.
      • Tim: does the addition of (horizontal) space between tof and glass important? There is currently about 2". We would like to minimize this, but this gap seems reasonable given the attachments that need to be made.
      • Tim: Reviewing the drawings now with Chuck. Chuck is making section drawings based on the 3D model for checking. Will get back to Matt with any feedback soon.
      • Dan and Manuel are completing the interlock system. Will provide design to JLab for feedback and approval once completed.
      • For safety considerations the back panel will have light weight connections, which could be broken in an emergency.
      • The doors have no locks. Magnetic locks hold the door shut, which can be opened in an emergency.
    3. Bases
      • Detailed count is underway to finalize contract of the Cockcroft-Walton bases. Nominally 10 mult boards and 20 comm boards still need to be delivered. Once the inventory is complete, the contract can be closed out.
  6. USM update
    1. SiPM Update (Javiera)
      • Shipped 520 SiPM to JLab, which have been received
      • Included a dump of the data base with the shipment, which Yi has uploaded to the mysql data base.
      • There were some questions about the contents of the dB, and the wiki page with information has been updated. The description at MySQL Database At UTFSM still needs clarification
      • A MPPC 3572 seems to have a dead sector. After verification of the problem, may need to return this sensor along with any others that fail specifications to Hamamatsu for replacement.
      • Serguei: asked if the response had been verified in stage 2. Javiera: Data have been taken but not yet processed.
      • Elton: when will the final shipment be requested from Hamamatsu? Francisco: Once some internal transfers are made at the university, they will request the final order.
    2. Light guides
      • So far 338 light guides have been produced, but only sufficient to complete 4 sets. Four sets will be shipped later this week (160 guides)
      • Production is at 60 guides per day.
      • The progress was shown on a shared excel sheet, but difficult to read remotely. Elton requested that Francisco send the file for reference. In the future, it could be uploaded to the portal for ease of access by remote groups.
  7. BCAL
    1. SiPM Update (Shaun): Updated slides Media:SiPMpresentationV2.pdf
      • Status update on previous work.
      • Minimum of overbias is at about 1.2 V relative to the breakdown voltage from Hamamatsu, but only 0.8 V above UofR measured breakdown.
      • The breakdown voltage current (as determined from the ADCs) was plotted vs voltage. It was suggested that data be taken to lower currents, but this is limited by the ADC at this time. Next month I-V curves will be taken for verification.
  8. TDR update
    • Zisis has checked major updates on the performance
    • Elton has checked in sections on the support structure/installation and is working on a section on calibration and monitoring. These should be checked in the next couple of days. Andrei should add some text regarding the calibration with charged particles.
  9. Calibration of Calorimeters
  10. Simulations/Reconstruction: Status of Sample Fraction Study (Andrei)
    • The study of sampling fraction is converging.
    • Andrei has a prescription for estimating the resolution, which depends inversely on the square root of the sampling fraction. The sampling fraction has been determined from the simulation as a function of the shower energy, angle and cell location.
    • This scheme can be incorporated into the simulation that David has developed.
    • Discussion will continue on this topic.
  11. Any other business
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