Mar 17, 2011 Calorimetry

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Revision as of 13:26, 17 March 2011 by Elton (Talk | contribs) (Minutes)

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Teleconference Time: 11:00 a.m. EST

  • ESNET (Number is 8542553) and EVO session (GlueX Calorimetry meeting room)
  • JLab Phone: in CC F326 is 757-269-6337
  • Regina Phone: in LB228 is 306-585-4204
  • Athens Phone: in Christina's office is 011-30-210-727-6947
  • 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 #)

Items for followup from previous meeting(s)

  1. Monitoring
    • Fcal: check cross talk of calibration inputs across modules.
  2. Fcal construction
    • JLab to provide shipping guidelines to Matt

Tentative Agenda

  1. Announcements
    • Starting next week, we will move the Bcal Readout meeting and Cal Working Group meetings to TUESDAY 11:00
  2. Review of Action Items
  3. Calibration
  4. BCAL
    1. Construction Status: builds, fibre QA
    2. First article testing (Yi) Result Page
  5. FCAL
    1. Construction Status: mechanical, bases - no report
    2. Drawings for Fcal structure (Tim) Sketches for comments on FCAL structure
  6. Simulations
    1. Readout segmentation (Andrei)

Minutes

Attending:Elton, Yi, Eugene, David, Tim, Beni, John (JLab); Zisis, Andrei (UofR); Will (USM); Christina (Athens),

  1. Announcements
    • Starting next week, we will move the Bcal Readout meeting and Cal Working Group meetings to TUESDAY 11:00
  2. Review of Action Items
  3. Calibration
    1. Concept for Fcal settled
    2. Discussions on Bcal option underway
      • Will present concept to this group at next meeting (Mar 29)
      • Modifications include daisy-chaining LED boards together
      • Use CAN bus to communicate with control boards
      • Consideration for optimum placement of LED boards on detector, including possibly attaching 2 fibers to each LED
      • UofR will come up with some sketches that can be passed on to our designers to verify geometry
  4. BCAL
    1. Construction Status: builds, fibre QA
      • Construction proceeding well. Modules 33 and 34 are about 30-40% complete.
      • Machining of Module 26 started Mar 15. Start delayed to allow large job from Alabama to be completed at Ross Machining.
      • Schedule for shipping will be updated once two modules are finished. Expect two shipments, one at the beginning of April, one at the end.
      • In view of the disaster in Japan, they have assessed the inventory of fibers. They have in hand 10 weeks of fibers in stock.
    2. First article testing (Yi) Result Page
      • Received 80 first-article samples from Hamamatsu last Wed.
      • To date 25 units have been tested, but results are still under evaluation
      • Test use a calibrated LED and five light settings using a neutral density filter.
      • Gain measurements are relative, absolute calibration not yet completed.
      • Rates normalized to 25deg C (where Hamamatsu specifies the units). Dark rates are about 16 MHz/array, about 4 times lower than original samples. Eugene would like to know what has changed in the fabrication process.
      • Tim: Have any dimensional checks been made?
      • Zisis: Suggest that Yi add quick progress checklist on the wiki for easy reference of measurement status.
  5. FCAL
    1. Construction Status: mechanical, bases - no report
    2. Drawings for Fcal structure (Tim) Sketches for comments on FCAL structure
    • Following the last meeting, Tim, Wayne, Matt and John met to go over details
      • Decision to stiffen support structure. Tim and Wayne have had discussions with designers of the support frame for the JLab Big-Cal support structure, who provided feedback to our concept
      • IU will build a prototype to test the layout with two rows of 20 bars, which will take 4 weeks.
      • Fabrication of parts will follow after incorporating feedback from the prototype.
  6. Simulations
    1. Readout segmentation (Andrei)