Revision as of 14:24, 4 February 2016

Video Conferencing Information

Meeting Time: 11:00 a.m. EST

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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

References

1. Preparations for Spring Run

Action Items

1. Spring 2016 run preparations
2. Work on BCAL NIM paper outline & construction section (Zisis)
3. Sampling fraction tables (Tegan, Andrei)

Agenda

1. Announcements
2. Action Items:
   1. Preparations Spring 2016: Rates posted to the mailing list Ready. DAQ issues (triggering) with LED data taking are not completely fixed. LED data files exist (look at elog on the hot checkout). Files triggered by the trigger supervisor (1 file - about 1000 events, separate up and downstream data; might have EPICS events) and one standalone trigger file. Need program to check all the SiMs using trigger supervisor. Ahmed will get the hand off from Will. Look for trigger bits.
   2. Zisis got the construction stuff together for the BCAL NIM. Elton gathering SiPMs. Zisis will do outline. Use Mike's share latex -- Mike will set up things for the BCAL NIM.
3. Calibration/Commissioning
   1. Calibration of BCAL with cosmics (Andrei, Irina)
   2. Time-walk corrections (Noemi)
   3. Layer efficiencies / LED data (Ahmed)
   4. Effective speed (George)
   5. Muon decays (Will)
   6. SiPM Test Plugin WIP (Will) [2]
   7. Gain Factors in ccdb
4. Reconstruction
5. Any other business

Minutes

Attendees: Elton, Simon, Mark (JLab), Curtis, Will M, Christina (Athens), Mike S (CMU), Tegan, Andrei, Ahmed, Zisis (Regina)"

1. Announcements: solenoid wants 1250 Amps. Yesterday there was a trip on the electronics. Hall is closing at 2pm today of beam.
2. Action Items:
3. Calibration/Commissioning
   1. Calibration of BCAL with cosmics (Andrei, Irina): Analysis for runs at 1.4 V over bias and at 12 C for SiPMs. Pedestals mostly around 100 but come up to 200. Top of blue peaks look flat, considering that this is a log scale. The plots suggest instabilities in the pedestal. Start peak shows spike at channel 16, so there are probably some events between 0-15. (Andrei cuts above 16). Tails are too long for cross talk (200 ns) or after pulsing. Probably we are dealing with accidental noise on the right tails (60-100). It looks like 1-3% of the events are affected. 20% effect of S26/S60 windows. Width is different; may come from pulse shape differences in the two windows, which is a plausible explanation although not expected (effect is less than 3%). Mark looked at the 26 vs 60 and put it in the logbook, the result there was 0.88 for 26 over 60 so it gives 1.14 as a ratio. It agrees with Andrei's mean which is a bit higher. Elton did an estimate with a parametrization which may have been for 0.9V, which is an average with the main effect being the z-dependence (reflected pulses). Might need to take the z into account when comparing cosmics with other calibrations. Take sufficient data in the spring to allow such systematic studies.
   2. Time-walk corrections (Noemi): RF and beam bunch, aiming at TDC_BCAL minus TDC_START for time-walk. Elton asked question about linear term. We need to decide on parametrization.
   3. Layer efficiencies / LED data (Ahmed): waiting for new data with new emulation. Fixed bug for online plugin and it is in github courtesy of Sean.
   4. Effective speed (George): discussion took place last week (see Calorimetry meetings) on stability/robustness of v_eff. George studying about quantum physics.
   5. Muon decays (Will): nothing to report.
   6. SiPM Test Plugin WIP (Will) [3]: Plugin to check SiPMs. Ahmed will pick up the work for the long haul of stability checks. Will has switched from old macro to plugin. Some missing LEDs which are weak. Run 10006 had TS supervisor. For both ADCs and TDCs. The plugin outputs text files. A few more tests, bugs and additions needed, but it mostly works well. Plugin needs manual input of the LED bias. Mark: what about false positives? Will has not implemented it yet. TDC plots look more uniform because they show multi hits. We expect green, everything hire shows multi hits. Opposite side LEDs help us on the side where there are weak LEDs.
   7. Gain Factors in ccdb: gains from the three run periods to date.
4. Reconstruction: Shaun posted that BCAL timing is off between reconstructed showers and truth time. In MCsmear we use v_eff from George but when we make the points in DBCALPoint we use the old 16.75 cm/ns. Tegan will see if matching these will fix it.
5. Any other business:
   1. no objections to stopping the BCAL Reconstruction meetings (after several years) and putting their reports in the Calorimetry Meetings. This will open up time for a eta working group meeting.
   2. Shaun has comments distributed through git; all students are on git. For code issues this may be ok but for plots and discussion? Elog or email. Let's think about it.