Sep 8, 2016 Calorimeter

Video Conferencing Information

Meeting Time: 11:00 a.m.

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Participant Direct Lines

• JLab Phone: in CC F326 is 757-269-6460 (usual room)
• JLab Phone in CC L207 is 757-269-7084
• Phone in the Regina Video-conference Suite is 306-585-4204
• Athens Phone: in Christina's office is 011-30-210-727-6947

Action Items

• Produce documentation for implementation of timing algorithms and constants (Andrei)

References

1. FCAL HDFCAL log book
2. BCAL HDBCAL log book
3. BCAL Action Items and Working Tasks

Tentative Agenda

1. Announcements
2. Action Items
3. Preparation for REST production
4. FCAL update
5. BCAL update
   • Variance-covariance matrix for BCAL showers matrix elementsexample distributions
   • Timing comparison plots
6. Calibrations
7. Reconstruction and Simulation
8. Any other business

Minutes

Attendees: Elton, Mark, Adesh, Jon (JLab); Sean (NW); Matt (IU); Curtis, Will (CMU); Zisis, Andrei, Ahmed (UofR); Christina (Athens).

1. Announcements
   • Solenoid has been powered at 1350 A for about a day and a half.
2. Action Items
3. Preparation for REST production
   • Launch is now in progress
4. FCAL update
   1. Hardware
      • Turned on HV to all pmts
      • FADC crates do not yet have the new firmware. Expect updated firmware by Monday so that we can start checking detectors
      • At the moment there are 10 problem bases: 6 from the spring run, 2 with communication issues and 2 new problems. It appears that there has been no degradation of the bases with the HV off.
      • To date we have fixed about 500 bases
      • Chris Stanislav has a working setup for testing/fixing bases here at JLab. He believes he is ready and capable of fixing bases, but has not started due to other priorities.
      • We currently have 100 spare bases on hand.
      • Nick has repaired and replaced two fADC boards that had single failed channels. There was a connection problem at the input.
      • Hovanes has made available a PDU to power the supplies and it is being installed in the hall. This will allow remote cycling of power.
      • Another iteration will be made on setting the HV on the bases to adjust the gains in hardware. Once the DAQ is back running, the LED pulser system will be used as feedback for adjustment along with the gains determined using the pi0 calibration.
      • Adesh expects that the adjustment will be less than 10 V. The hardware adjustment will minimized variations in individual thresholds.
5. BCAL update
   1. Hardware
      • BCAL voltages have been turned back on.
      • Two LV channels failed over the summer and failures were traced to the MPOD electronic boards. These have been replaced. Fernando and Chris are looking into fixing the boards and will check on spare availability. Note that a single LV feeds 4 Bcal modules.
      • Ahmed: Noted that the LED monitoring data during the run had periods of jumps by quadrants. Elton said that the distribution of the pulser signals is done by quadrant and this may be a connection. There remained several detailed questions that we decided to discuss offline.
      • Matt: How is the pulsing going to proceed for the run? Elton: It was setup for pulsing continuously through the run for both Bcal and Fcal. The Bcal has a script that runs asynchronously with data taking and cycles through all 16 configuration. The Fcal probably wishes to setup something similar. Adesh will talk to Hovanes to see how best to implement such a scheme.
   2. Variance-covariance matrix for BCAL showers matrix elementsexample distributions
   3. Timing comparison plots
6. Calibrations
7. Reconstruction and Simulation
8. Any other business