Mar 6, 2012 Readout
From GlueXWiki
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)
Contents
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
- Beamtest
-
Investigate if Hall B chiller is available for our use (Elton)Chiller will be used for the HPS beamtest. - Draft a run plan (Elton and Zisis)
-
Consider optimum configuration for 40 Bcal LED boards on mini-Bcal (Zisis, Elton, Christina): centre two columns on each side
-
Presentations from recent meetings
Tentative Agenda
- Announcements
- Review of Action Items
- BCAL Beam Tests 2012 - Check List
- Hall B (John)
- Mechanical (Tim)
- SiPMs/LGs/Cooling (Elton, Fernando, Scott)
- Monitoring: LEDs+boards+controller (Christina)
- Test full Mini Cal with cosmics
- LV, HV, VXS, Flash ADC, F1TDC, Discriminators, NIM, Trigger (Sascha)
- Online Coda/Analyzer / Data to disk/tape (Sascha)
- Logbook, e-log
- Run plan (Elton, Zisis)
- Simulations (Andrei, Irina)
- Manpower/shifts
- Update from USM
- Status of Testing at JLab
- Other
Minutes
Attending:Elton, Yi, Eugene, John L., Beni, Tim, Sasha (JLab); Will,, Hayk, Javiera, Sergei, Orlando (USM); Zisis, George, Andrei, Mehrnoosh UofR); Christina, George, Pavlos (Athens).
- Announcements
- Review of Action Items
- Monitoring
- Four SiPMs are being prepared for shipment (new rules require DOE approval)
- Tracking indicates that LED boards have arrived at JLab.
- Discussion about attaching LEDs into light guides so that they could be removed and returned to Athens for additional testing.
- JLab will see how they fit on light guides and options for mounting and communicate offline.
- Christina: Need to check pitch and flexibility of cable connecting boards. Jlab will provide feedback soon.
- BCAL Beam Tests 2012 - Check List
- Hall B (John)
- Elton and John have installed a fourth "remote" scintillator at approximately the 45% position
- Mechanical (Tim)
- Brackets are being machined
- SiPMs/LGs/Cooling (Elton, Fernando, Scott)
- 80 SiPMs have been selected and are being readied for installation. They correspond to 8 voltage groups. Each SiPM has unique jumpers to span the range of sensors from Hamamatsu
- Testing has not started yet. There is some ringing in the preamp boards. Fernando is investigating. Could be due to mismatches in impedance and or grounding problems.
- Once the ringing is fixed, the sensors should be able to be tested in a couple of days.
- Monitoring: LEDs+boards+controller (Christina)
- Test full Mini Cal with cosmics
- LV, HV, VXS, Flash ADC, F1TDC, Discriminators, NIM, Trigger (Sascha)
- Online Coda/Analyzer / Data to disk/tape (Sascha)
- Logbook, e-log
- Run plan (Elton, Zisis)
- John will coordinate schedules with other groups from Halls A and B.
- The present goal is to install the mini-Bcal on Wed Mar 21, but could be a week later.
- Simulations (Andrei, Irina)
- Manpower/shifts
- Zisis: Regina will have undergraduates that can help out with testing modules this summer.
- Hall B (John)
- Update from USM
- Production Manager Report (Javiera)
- Presented the mapping of electronic channels to SiPM pins
- Received a new Wiener CAMAC controller for Station 2. This will allow them to increase the DAQ rate from 30 Hz to 1KHz
- Station 3 condensation problem.
- Added a second heat exchanger. They now have one on each side of the dark box.
- The following procedure is followed: The heat exchanger near the LED (where condensation is not important) is set to 2 deg C. Then the heat exchanger near the SiPMs is set to 5 deg C. After settling both are set to 5 deg. this procedure seems to work. There is presently no ventilation in the system.
- A backup plan to circulate nitrogen has been costed.
- Humidity in the room is about 45-50%.
- Station 3 Analysis (Hayk)
- Alam has been working on fixing all channels and they are almost all working
- Hayk has implemented a new method to extract the DR and Xtalk. The DR extraction is now twice previous analysis, but has a smaller temperature dependence.
- Still using 120 ns gate. Planning to increase gate to 1 micros and investigate sensitivity of results
- Comparison of extracted dark rate and charge in gate/gate width is inconsistent. Investigating cause
- George Lolos: UofR has investigated the systematics of extracting the SiPM parameters as a function of many conditions and will make that available for reference.
- USM Web Interface to DB
- Production Manager Report (Javiera)
- Light guides
- Will: Getting setup to high rate production of light guides.
- Missing light guide "K" is packaged and ready for shipment.
- Light guide arrival
- Elton measured the relative light transmission of the light guide F using 3 different wrappings: tedlar, acid-free paper and Al mylar.
- Within 10%, all wrappings resulted in the same transmission as no wrapping.
- Tedlar was chosen for the wrapping because it eliminates extraneous light (i.e. opaque) and is thin.
- Status of Testing at JLab
- Other