Feb 12, 2013 Calorimetry

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Revision as of 14:30, 12 February 2013 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)
  • 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 757-269-6460 (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)

  1. After summary of SiPM parameters, provide data to Hamamatsu for comments (USM)
  2. Fcal: JLab to provide feedback (approval) on dark box construction (Tim and Chuck)

Tentative Agenda

  1. Announcements
  2. Collaboration Meeting
  3. Action Items
  4. Monitoring: Media:UpdateFCALFeb2013_2.pdf
  5. FCAL - 1080 Blocks Stacked [1]
  6. BCAL
    • Tested modules 45, 48, 49, 46, 47, 44, 42, 41
    • Media:Run638 cosmic fadc Mod41.pdf Overnight cosmic-ray run for module 41
    • Trigger provided by single 30x10cm2 counter placed underneath the middle of the module
    • Data is pedestal subtracted. Pedestal sigma ~ 1 count
    • Peak is at 18 counts. Expect mip ~ 20 MeV ~ 20 counts.
  7. USM
  8. Simulations
    • Wrapping up loose ends on BCAL simulation
    • Plan for BCAL reconstruction
    • Hadron interactions in FCAL
  9. TDR update
  10. Calibration of Calorimeters
  11. Any other business

Minutes

Attending: Elton, Yi, Beni, David, Eugene, Sasha (JLab); Christina, Pavlos, Stratos (Athens); Matt (IU); Zisis, Shaun, Andrei (UofR); Hayk, Alam, Elias, Will (USM).

  1. Announcements
    • Regina crew will participate in the Winter/Nuclear conference in Banff, Alberta next week.
  2. Collaboration Meeting
  3. Action Items
  4. Monitoring: Media:UpdateFCALFeb2013_2.pdf (Stratos)
    • New results on slide 8
    • Configurations studied: a) blasted (i.e. sanded down with sander and #2000 sand paper, b) same but larger area blasted, c) sanded and wet with glycerine to smooth surface.
    • Beni: Blasted side near or opposite pmt? Near side, but other side shows similar results
    • By collaboration meeting will try to attain better uniformity.
    • Matt: How to relate "small" pmt response with lead glass? Compare slides 3 and 8
    • Eugene: What about regular scratches? Stratos: Have considered CNC machine to control "scratching" but none readily available.
    • Matt: In priority list for Fcal: a) cover range of required light b) stability and c) uniformity
    • Matt: please send bar code for pmt (to compare to typical sensitivity).
    • Elton: How long to complete project once acceptance is completed? Most parts are available, so fabrication should take about one month.
    • Christine: Signal measured over a 3-4 days was stable.
  5. FCAL - 1080 Blocks Stacked [2]
    • Current progress on stacking shown in picture. Already up off the step plate.
    • John Frye will travel to JLab this week or next to help set the steel for the beamhole, which floats in z
    • Survey will be done to check height of top plates and align beam hole
    • Cockcroft-Walton bases continue at steady pace toward 3000 of contract. Currently have about 100 spares
    • Dark room work continues with discussions with Chuck and Tim. Certified welds must be done correctly and according to code.
    • At some point, the stacking progres should be entered into the project schedule because it is going much faster than anticipated.
    • Will: Survey should be conducted to check for any tilting or other deflections after weight of blocks has been added. There could be changes in position, for example, due to settling of the building
  6. BCAL
    • Proposal to distribute LED bias using "rotated" quadrants, i.e. one top, one bottom and two horizontal.
    • We are using the convention that the side with the stamp identifiers will be the upstream end.
    • Tested modules 45, 48, 49, 46, 47, 44, 42, 41
    • Media:Run638 cosmic fadc Mod41.pdf Overnight cosmic-ray run for module 41
    • Trigger provided by single 30x10cm2 counter placed underneath the middle of the module
    • Data is pedestal subtracted. Pedestal sigma ~ 1 count
    • Peak is at 18 counts. Expect mip ~ 20 MeV ~ 20 counts.
    • Zisis: Suggestion to use two counters to trigger and better define cosmic-ray geometry
    • Beni: Low pedestal peak is probably offset from zero because the maximum count is taken
  7. USM
    • Orlando's poster File:OrlandoPosterViena.pdf
    • Scratched MPPC's PDE MEDIA:ScratchedMPPCsPDE.gif
    • Picked PDE to check effect of scratch damage because it seemed to be the most sensitive parameter. Other quantities were also compared but did not show any systematic differences before and after
    • PDE is relative measurement in station 3
    • Recent measurements (after scratching) are within uncertainties although somewhat higher than before (before scratching). All measurements exceed our specifications
    • Elton: Proceed with incorporating these back into the general mix of tested SiPMs. However, the complete set of sensors that are suspect should be checked.
  8. Simulations
    • Wrapping up loose ends on BCAL simulation
    • Plan for BCAL reconstruction
    • Hadron interactions in FCAL
  9. TDR update
  10. Calibration of Calorimeters
  11. Any other business

Attendees: