Feb 7, 2012 Readout

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. Jlab (Yi) and USM (Hayk) will make available raw spectra for fitting by other groups to check consistency.
   • Yi forwarded fits of USM data from Dec 5 to Zisis
   • See e-mail Jan 30

Tentative Agenda

1. Announcements
2. Review of Action Items
3. Calorimetry Talks at the Collaboration Meeting
   1. Friday Feb. 17, 13:30 Session IVa (120) --- Calorimetry - (Organizer: Zisis Papandreou ) - Chair
4. Update from USM
   1. Run manager report
   2. Station 2 analysis (Sergey)
   3. Station 3 analysis (Hayk)
   4. USM Web Interface to DB
5. Status of Testing at JLab
   1. Hall-D ELOG
      1. Spectra with Chiller ON
      2. Some photos
6. BCAL Beam Test
7. Other

Minutes

Attending: Elton, Eugene, John L., John C., Yi, Sasha, Beni (Jlab); Will, Hayk, Javiera, Orlando Soto (USM); Zisis, George, Andrei (UofR); Christina (Athens).

1. Announcements
2. Review of Action Items
3. Calorimetry Talks at the Collaboration Meeting
   1. Friday Feb. 17, 13:30 Session IVa (120) --- Calorimetry - (Organizer: Zisis Papandreou ) - Chair
      • Four talks scheduled. Offline will be discussed how the information is presented on the SiPM
4. BCAL Beam Test
   1. Electronics (Sasha)
      • On hand: 48 channels of FlashADCs (Need: 32 channels for miniBcal + trigger and spares)
      • On hand: 32 channels of F1 TDC (Need: 32 channels from Beni)
      • On hand: 16 channels of Discriminator (Need: 32 channels, need to secure one more)
      • On hand: NIM bin + logic available
      • Need: trigger scintillators
      • Need: additional VXS crates, etc unless we can share with Fcal
   2. Schedule (John)
      • Next week Fcal and Hall B will conduct a joint test to establish electron energies into detector
      • 1-2 Weeks electron beam test
      • 1-2 weeks 2 pass photon beam
      • Target change, mid March
      • 1-2 weeks 3 pass photon beam
      • Remainder of time 5 pass photon beam (April/May)
      • Fcal would like to accumulate data in alcove at three energies
      • Perform all Flash DAQ tests before moving down to Hall B floor
   3. Paperwork (Zisis)
      • Prepare executive summary in the next few days so that Eugene can talk to Volker
      • DRAFT Proposal will follow later this week for feedback
5. Update from Athens
   1. Submitted designs for all boards and submitted to JLab
      • Fernando will review and provide feedback
   2. Started to build first article
      • Boards should be received next week and can be populated
      • If possible the boards will be tested in Hall B with mini-Bcal
6. Update from USM
   1. Run manager report
      • Testing has started in Stage 2 after some faulty starts and minor repairs of setup
      • So far measured six JLab SiPMs and more from Hamamatsu
      • Stage 3 refurbished to start testing
      • Amps with low gain replaced
      • Presently testing more JLab MPPCs
      • Added thermal pad (1 mm 2000S40) for half the sensors to check systematics
   2. Station 2 analysis (Sergey)
      • Revision of all data
      • Updated conversion factors based on photodiode data and spectral response
      • USM results compare favorably with Musienko data from CMS
      • Comparison of PDE, gain, DR and cross talk compares well with JLab data, although some systematic differences remain.
      • All parameters measured at Vbr+0.9 V. [Yi: JLab used the Hamamatsu proposed operating voltage, which was measured to be about Vbr+0.95V].
      • JLab gain about 5.5x10^5, USM gives about 5.0x10^5.
      • JLab PDE about 20%, USM gives about 24%
      • Sergey: Uniformity of PDE over the MPPC is very good
      • Yi: Compared the two methods of extracting PDE: N0 in ped vs full fit. Differences due to method is less than 1%.
   3. Station 3 analysis (Hayk)
      • New data shown. Data taken with <Npe>~2.5 compared to 1.5 for previous data.
      • Still need to remeasure some amplifiers
      • Fitting routine takes about 30 min/MPPC. Fast algorithm is about 6 times faster, but fitting will be used.
   4. Based on today's presentation, Elton will send message to the listserver approving production testing at USM. Full approval of Stage 1 and 2. Conditional approval of Stage 3 based on USM verifying proper thermal contacts of MPPCs to cooling plate.
   5. USM Web Interface to DB
7. Status of Testing at JLab
   1. Hall-D ELOG
      • Preliminary data is now being taken. Chiller set to 10 deg C.
      • Two preamp boards populated (8 channels)
      • Problem with DC offset out of original board.
      • Revised board replaced resistor with a capacitor to eliminate baseline. Data shown are for the board with the capacitor.
      • Data shown for 200 ns gate. Signal to noise decreases as gate is increased.
   2. Spectra with Chiller ON
   3. Some photos
8. Other