Nov 22, 2011 Calorimetry

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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; JLab Phone in CC L207 is 757-269-7084
  • Athens Phone: in Christina's office is 011-30-210-727-6947
  • Regina Phone: in LB228 is 306-585-4204
  • 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
    • Send Christina drawings of light guides, both versions (Elton)
    • Send Christina precisely which geometry/version of light guides were shipped (Iñaki)
    • Send additional SiPMs to Athens for tests (Elton)
  2. USM testing
    • Web site test next Monday.
    • Show data from dark box at next meeting.

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. Monitoring.
  4. Beam tests in Hall B (fall 2011) (John)
  5. FCAL
    1. Construction Status: mechanical, bases (notes from Matt)
  6. BCAL
    1. Construction Status: builds, mini module
    2. Fibres
  7. USM update
    • Note from Will: I have a schedule conflict with this meeting. However, Hayk is at JLab taking shifts (I don't know if he's available) and some of the others may be available for joining the meeting remotely.
    • Sergey currently thinks we can demonstrate working test stations for a December 15 review. We need to discuss this somewhat more before finalizing it, and of course we should send you documentation quite soon if this is going to happen on that date.
  8. Simulations/Reconstruction
  9. Any other business

Minutes

Attending:John L., Elton, Yi (JLab); Zisis, George, Andrei (UofR); George, Pavlos (Athens); Hayk, Ricardo (USM).


  1. Announcements
  2. Review of Action Items
  3. Monitoring.
    • Fcal Monitoring - Blue 3 Corner 3
    • Plexiglass measurements to check uniformity of illumination
    • Shows intensity normalized to largest value
    • Elton: noted that the cartoon showing the location of pmts was not quite consistent with data locations. Zisis suggested that the distribution be updated after the meeting
    • Zisis: Inquired about the stability over time. George: This could be measured
    • Questions about treatment of edges. Several options can be tried.
    • A new plexiglass sheet of actual size will be obtained. Elton suggested that we generate a drawing of the proposed shape so it can be used for the next batch of tests.
    • New tests will also use Violet light LEDs, which may also change the distribution of light due to scattering.
    • We need to clarify the uniformity required for the calibration system. Matt looked up the E852 paper, which claimed a +/-5% uniformity.
    • George mentioned possibly scratching the surface to modulate light intensity, but this may prove challenging.
  4. Beam tests in Hall B (fall 2011) (John)
    1. Summary: all is well, things are working. HV setup working, DAQ running, stable beam over the weekend
    2. Data taken at different gain (HV) settings
    3. Actively processing data. Alignment left/right seems good.
    4. Alex is working on getting the Flash ADC scalers working
    5. With the data in hand, the performance can be analyzed and checked.
      • Gain balance
      • Alignment
      • Energy resolution
      • So far Flash ADCs sampling mode used, creating 1GB/s data stream. Learn to use the pulsed mode on the Flash
      • Check patterns coming out of the Flash indicating coherent noise, cross talk, reflections, etc.
      • Look at timing
      • Test Flash sums used in the trigger
  5. FCAL
    1. Construction Status: mechanical, bases (notes from Matt)
    2. Main concern is the fabrication of the Cockcroft-Walton bases by Total Electronics
      • Visit by company a couple of weeks ago sorted out accounting and billing issues.
      • Main issue is the multiplexor board that generates HV
      • At the moment 95 out of a batch of 110 bases were checked and return to be coated. Should get another batch of 110 for checking before coating
      • Taking extra caution to make sure the proper procedures are in place to guarantee successful HV performance.
    3. Other boards
      • communication board. All completed with 10% reworks
      • Easy board with 2 sockets and traces. Do not expect any problems here
      • Socket and a few components and a coax cable that needs attention still to be completed. Do not expect problems here either.
    4. Continue to glue light guides
    5. Restarted fabrication of mechanical parts (after working on beam test stands)
    6. John Leckey is simulating backgrounds from the insert in order to finalize that design.
    7. Tim promised to finalize the drawings for the welded frame and send it to them.
  6. BCAL
    1. Construction Status: builds, mini module
    2. Smooth sailing to the end
      • Last phases of machining modules 45-59.
      • the mini-bcal (58 cm long) will be completed and moved to Ross next week
      • Tentative shipping of last five modules + mini-cal and support stands on Dec 1.
    3. Fibres
      • Completed measurements of #29. Will analyze data and write up summary in Dec.
  7. USM update
    • Note from Will: I have a schedule conflict with this meeting. However, Hayk is at JLab taking shifts (I don't know if he's available) and some of the others may be available for joining the meeting remotely.
    • Sergey currently thinks we can demonstrate working test stations for a December 15 review. We need to discuss this somewhat more before finalizing it, and of course we should send you documentation quite soon if this is going to happen on that date.
    • Ricardo is working on interfacing the PDE to the data base.
    • Hayk said that the data coming out of stage 2 PDE measurement look very good (no plots were shown)
    • Analysis of the data is still under development. Yi will provide Hayk with scripts he has used for the JLab analysis.
    • Elton: the 30 MPPCs shipped to USM are expected to arrive tomorrow.
    • Hayk will schedule a meeting early next week with Will and Sergey to evaluate where we are and readiness for the review.
  8. Simulations/Reconstruction
    • Discussion on segmentation document, which Zisis is finalizing today. Comments were offered on where to place emphasis.
  9. Any other business
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