Mar 27, 2012 Calorimetry

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

Tentative Agenda

1. Announcements
2. Review of Action Items
3. Monitoring
4. Cable Labels
5. FCAL
   1. Construction Status
   2. 2011 Hall B FCAL Beam Test (John)
6. BCAL
   1. BCAL Beam Tests 2012
7. USM update
   1. Production manager report (Javiera)
   2. Station 3 temperature measurements (Orlando)
   3. Analytical analysis of light production and cross talk (Orlando and Sergey)
   4. New evaluation of cross talk using analytical formulas (Orlando)
   5. Station 3 data analysis (Hayk)
   6. Update on lightguide production (Iñaki)
8. TDR update
   1. Instructions for the TDR (You must be logged into the wiki to access this page).
   2. We need to start revising Chapter 4 Detector, Section 4.3 Calorimetry.
   3. Calibration of Calorimeters
9. Simulations/Reconstruction
10. Any other business

Minutes

Attending: Elton, David, Tim (JLab); Will, Sergey, Orlando, Javiera, Hayk, Iñaki (USM): Matt, John (IU); Zisis, Andrei (UofR); Christina, George (Athens)

1. Announcements
2. Review of Action Items
3. Monitoring
   1. First controller board
      • Arrived from Athens and has been installed on the mini-Bcal. Signals have not yet been checked.
   2. Second controller board
      • Order has been lost.
      • Unclear if it will be easy to add the second controller board to the mini-Bcal before (during) the beamtest
      • Decided that it would be useful to have the second controller anyway for mini-Bcal testing with cosmics this summer.
      • Christina will clear up initial order, then order the second controller so we can have it on hand as soon as it is needed
   3. Customs issues for SiPM loan
      • We and considering hand carrying the items.
4. Cable Labels
   • Elton asked Matt and Zisis to review labels for Fcal and Bcal, respectively
5. FCAL
   1. Construction Status
      • Continue to glue light guides
      • Cockcroft-Walton bases iterations with company
      • Company has produced a draft schedule with milestones for delivery of all bases, but the schedule has already changed since then
      • Issue is the conformal coating of the HV boards. They have contracted with a 3rd party vendor to coat 1900 units. IU will be able to inspect production before and after coating
      • About 500 are being coated at the company and will be shipped soon to IU for inspection
      • The first 500 assembled units are being taken apart a IU and recoated.
      • The present schedule will have all bases completed by the end of April.
      • The TRAN board is being produced satisfactorily
      • the socket board is produced in house and we anticipate no problems.
      • The completion of the project by June is very tight. Will re-evaluate situation next month.
   2. Support Structure
      • John L. is at IU and discussing cabling issues with John F.
      • Have all the certification docs from vendor except for the inspector's certification. Tim agrees that the contract should go forward and all final certifications obtained during fabrication.
   3. 2011 Hall B FCAL Beam Test (John)
      • Hall B is at 4 pass. Changeover to 5 pass was unsuccessful last week but accelerator has found the problem and expect to delivery 5 pass (electron) beam till next Monday.
      • Integrated Fcal and Hall B data were taken successfully to characterize the remote scintillators
6. BCAL
   1. BCAL Beam Tests 2012
      • Bcal readout assemblies were successfully put together and tested with LEDs last week,
      • The assemblies are presently mounted on the mini-Bcal.
      • Hovanes has written some EPICS GUIs to control the 5V and bias lines.
      • We were able to power one cell and see some cosmic-ray pulses on the scope. More checks to follow
      • Alex is starting to setup the DAQ system
7. USM update
   1. Production manager report (Javiera)
      1. Stage 1. Photos of 510 MPPCs taken and are being loaded to the dB
      2. Stage 2.
         • Problems included delivering the bias to the units
         • Data were taken when the reference PMT was in the wrong position, leading to incorrect PDE values
         • Issues corrected and new data are being taken
      3. Stage 3
         • Took data to see if second p.e. peak was visible
         • Increased DAQ rate so that scans can be taken more quickly
         • Readout in the dark box have been fixed, bringing the total number of working channels to 31.
         • To date a total of 270 sensors have been measured, but only 108 have all analysis completed.
   2. Station 3 temperature measurements (Orlando)
      • Very high uniformity of temperature was measured on the copper plate at three different temperatures.
      • Will suggested to show some data when the temperature was changing to verify correct operation of system.
   3. Analytical analysis of light production and cross talk (Orlando and Sergey)
      • Slides were shown with comparison of MC with analytical formulas for mean and sigma.
      • Used same notation as Yi
   4. New evaluation of cross talk using analytical formulas (Orlando)
      • Good consistency between analytical method and fitting technique.
   5. Station 3 data analysis (Hayk)
      • Showed uniformity of data from Stage 3 analysis for all quantities except dark rate.
      • Open discussion regarding acceptance criteria for the sensors completing this stage 3 test.
      • The extraction of the dark rate is problematic at room temperature and relatively low voltage (Vbr + 0.9V).
      • Considering robust extraction of the dark rate in all conditions.
   6. Update on lightguide production (Iñaki)
      1. Profile projector
         • Measurements of unpolished guides difficult due to large edges producing shadows over small edges
         • Polished guides also present some difficulties with some dimensions
         • The length of the table is not long enough to accommodate the 8 cm light guide. Elton suggested that a caliper could be used for this dimension
      2. Go/no-go gauges
         • Used a laser cutter to produce test gauge
         • Need to establish how much material is machined away to compensate for final dimensions
         • Use of gauges complicated because the light guides have angles. Elton: Suggest to make he gauge sufficiently thick to guide the light guide straight through (at least for the base).
      3. CNC machine
         • Parts to solve the problem with the x-position controller arrive yesterday
         • The system is being checked out now to see if the new parts fix the problem.
8. TDR update
   1. Instructions for the TDR (You must be logged into the wiki to access this page).
   2. We need to start revising Chapter 4 Detector, Section 4.3 Calorimetry.
   3. Calibration of Calorimeters
9. Simulations/Reconstruction
10. Any other business