Nov 29, 2011 Readout

Teleconference Time: 11:00 a.m. EST

• ESNET 8542553 and EVO session
• 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
• Phone:
  • +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)

Items for followup from previous meeting

1. Yi and USM coordinate working on common interfaces to the data bases.
2. USM questions
   • Cross talk between cells in PDE test (Will)
   • How is the light source for the PDE measurements calibrated?
   • Prepare indications for current status to determine whether Readiness Review date should stay
   • Send data from MPPCs (Will)

Tentative Agenda

1. Announcements
2. Review of Action Items
3. Monitoring Update (Athens)
4. USM Update
   • USM Web Interface to DB
     • to access the above, can use jlab and jlab as username and password
     • Under "Stage 3" click on "Run status"
     • Click on the "details" link next to a line with a *check* mark (not with an *x*)
     • Click on the MPPC number to see the 16 cells, or on the cell number to see just one cell
   • Discussion of Readiness Review: Testing of light sensors for Bcal
5. SiPM update
6. Electrical/cooling (Elton)
7. Geometry and light guides
8. Simulations
9. Other

Minutes

Attending: Will, Alam, Ricardo, Sergey tried unsuccessfully to connect (USM); Tim, Carl, Elton, Yi (JLab); Zisis, George (UofR); Christina (Athens)

1. Announcements
2. Review of Action Items
3. Monitoring Update (Athens)
   • Kappos has sent questions, which Christina will forward to Fernando and Elton, regarding labeling of the Bcal board and schedules.
   • There was some discussion on the tradeoffs between permanent ink and stickers, with a preference for permanent ink.
4. USM Update
   1. USM Web Interface to DB
      • to access the above, can use jlab and jlab as username and password
      • Under "Stage 3" click on "Run status"
      • Click on the "details" link next to a line with a *check* mark (not with an *x*)
      • Click on the MPPC number to see the 16 cells, or on the cell number to see just one cell
   2. The database was running for a while and data were shown from the stage 3 setup
      • George: Asked about the uniformity of the light source and if different arrays could be compared directly. The source is 1.5 m away from the sensors, so should represent a relatively uniform source, but this has not been checked in detail. At the moment the LED source is not diffused.
      • Will: How are the MPPCs biased? Alam: they are all set to the same bias.
      • The histograms were cut off at the low edge. Carl: The settings used for the V792 QDC were to a) disable threshold b) set the pedestal to maximum. In addition, some inputs (at JLab) had to be rerouted to bring the data (to the right) into the visible range of the QDC.
   3. Discussion of Readiness Review: Testing of light sensors for Bcal
      • We keep the current plan to have the Readiness Review on Dec 15. Elton will attend. Carl is hoping to update his passport in time to travel also.
      • The written materials for the review are due by the end of next week
      • Ricardo said that the programing and interfaces for stage 2 would be completed next week.
5. SiPM deliveries
   • All deliveries to JLab have been completed
   • Notification from FEDEX indicate that the shipment of 30 SiPMs from JLab have cleared customs in Santiago and should be in route to USM
   • Payments are being made to Hamamatsu in order to keep their schedule for first delivery to USM the first week of December.
6. SiPM testing (Jlab)
   • All components are ready except for the electronic boards
   • The electronic boards were ordered before Thanksgiving and are expected this week.
   • The test setup should be ready in about a week
7. Electrical/cooling (Elton)
   • Mechanical parts are in hand or ordered for two ends of one Bcal.
   • The electronic boards are essentially finished but are being checked. They should go out for fabrication before the holidays.
8. Geometry and light guides
   • Material for light guides was ordered and has been received
   • Iñaki has found a resource expert in polishing telescope mirrors. They are working together to polish the flat guide surfaces minimizing rounded edges.
   • The current production rate is 4 polished guides per person per day. However, this does not take advantage of the diamond milling, so should speed up. Additional labor will be hired according to the final requirement
   • Large milling machine has arrive and will be moved into the laboratory building near the robot tomorrow.
9. Light guide material
   • George raised the question regarding Cerenkov radiation in the downstream light guides and whether non-UVT material should be used.
   • Elton said that UVT was specified to ensure high quality and resistance to aging. We do not expect significant background from Cerenkov radiation, but a detailed study with the latest geometry has not been completed.
   • Will said that it is possible to substitute a different material for the downstream light guides.
10. Simulations
11. Other