May 8, 2014 Calorimetry

Teleconference Time: 11:00 a.m. EST

• ESNET (Number is 8542553) and SeeVogh session (GlueX Calorimetry meeting room)
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• Phone connection only upon request.
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  • +1-303-248-0285 : International
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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 Videoconference Suite is 306-585-4204
• Athens Phone: in Christina's office is 011-30-210-727-6947

Items for followup from previous meeting(s)

• BCAL: Check max ratings for MPPCs (Elton).

Tentative Agenda

1. Announcements
2. Collaboration Meeting May 12-14
3. Action Items
4. FCAL
   • HDFCAL log book
5. BCAL
   • HDBCAL log book
6. Reconstruction and Simulation
7. TDR update
8. Calibration
9. Any other business

Minutes

Attendees: Manuel, Laura, Shayne, Will, Mark, Zisis, Elton, John L., David, Yi (JLab); Andrei, Teigan (UofR), Matt (IU).

1. Announcements
   • CEBAF delivered 10.5 GeV beam to the tagger dump last night!
2. Collaboration Meeting May 12-14
3. Action Items
4. FCAL
   • HDFCAL log book (John)
   • Fcal detector continues to work with no known problems
   • New firmware installed on Fadcs seems to have addressed all known problems with the Fadcs
   • Log book entry shows timing of LED pulser run, with the timing determined by the IU "linear interpolation" method
   • David: Note that the hardware this algorithm is not currently implemented in the hardware and plans for implementation are not clear
   • Timing of single events shows regions of similar timing and the pattern of timing is correlated with crates.
   • Problem is likely due to timing distribution to the crates
   • Pedestals: First look at overnight pedestal run shows some 3 hour structure (as for the BCAL) , but with much reduced amplitude (~0.6 channels)
5. BCAL
   1. HDBCAL log book (Mark)
   • First look at pedestal stability in BCAL
   • ~3 hour period for baseline oscillations with detector powered on
   • Same structure seen in data (not yet entered into the log) for pedestals with the power off, but at a reduced amplitude
   • Oscillations seem to correlate with the temperatures in the crates, which vary by about 2 degF. [Note: temperature variations of the MPPC chillers has a period of about 20 min and voltages are very stable.]
   • Matt: Each Fcal base has a temperature sensor that could be used as a reference for temperature variations in the hall. They accessible through the CAN controller that has a network address to access data.
   • Changes in the pedestal when power is shut off to the MPPCs are about 20 counts. However, in one slot of one crate, they show variations of order 70-80 counts, which is likely not physical.
6. Reconstruction and Simulation
7. TDR update
8. Calibration
9. Any other business