Π polarizability Meeting Mar 30, 2022
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09:30 EST (JLab time) Weekly Meeting
REMOTE during Covid-19
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Meeting ID: 160 862 8791
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Elton Smith is inviting you to a scheduled ZoomGov meeting. Topic: CPP Weekly Meeting Time: This is a recurring meeting Meet anytime Join ZoomGov Meeting https://jlab-org.zoomgov.com/j/1608628791?pwd=bXhtZjdNRi8xeXZqWFh5T1R3TDBFdz09 Meeting ID: 160 862 8791 Passcode: CPP One tap mobile +16692545252,,1608628791# US (San Jose) +16468287666,,1608628791# US (New York) Dial by your location +1 669 254 5252 US (San Jose) +1 646 828 7666 US (New York) +1 669 216 1590 US (San Jose) +1 551 285 1373 US 833 568 8864 US Toll-free Meeting ID: 160 862 8791 Find your local number: https://jlab-org.zoomgov.com/u/acZK7hDWFf Join by SIP 1608628791@sip.zoomgov.com Join by H.323 161.199.138.10 (US West) 161.199.136.10 (US East) Meeting ID: 160 862 8791 Passcode: 112160
Action Items
- Check with Sasha on steps for "replay"
- Work with Justin to create the appropriate translation tables for the scalers (Beni)
-
Develop a draft plan for Pb alignment| Draft Proposal (Ilya)
Preliminary Agenda
- Previous CPP meeting: Mar 23, 2022
- Previous CPP Software meeting: Π polarizability Software Meeting Mar 17, 2022
- Announcements
- Action Items
- CPP and NPP Run Conditions
- Photon beam / tagger / diamonds
- Software/Calibration
- Simulations
- MWPC Testing
- CPP and NPP Experiment Configuration
- CPP-NPP trigger
- DAQ and Electronic Setup (Sergey and Beni)
- Other business
- Next meeting
Minutes
Attending: Alex, Andrew, Mark, Beni, David H., David L., Elton, Ilya, Nikhil, Rory, Sergey, Simon
- Previous CPP meeting: Mar 23, 2022
- Previous CPP Software meeting: Π polarizability Software Meeting Mar 17, 2022
- Announcements
- Action Items
- No progress on replaying random trigger data from December to check firmware
- CPP-NPP trigger (Ilya)
- TOF pmt gains should be adjusted before the run (Beni). Peaks are nominally set to 700 counts above baseline (~100 counts)
- Scale is 500 mV = 4095 counts (baseline is about 100 counts)
- Ilya: Need to adjust thresholds for trigger.
- Ilya: Will present rate dependence of gains next meeting.
- Draft Proposal (Ilya)
- Proposal was presented and questions answered. The precise mechanics of adjusting the frame need to be understood. Will check with Tim at next Design meeting.
- Rory: Need a scale; perhaps a caliper and level to help adjustment.
- CPP and NPP Run Conditions
- Simon: Information about beam conditions sent to Pavel Degtiarenko so that he can prepare the RSAD.
- Elton: Modify ESAD with information about the muon detector. Will get feedback from Ed Folts.
- Photon beam / tagger / diamonds
- Elton: Initial table of microscope energy assignment has been made and will update ccdb.
- In the use of the BH files (generated with Beam = 12 GeV) there is an inconsistency generated when reconstructing for a specific run number. Will get a best guess for the beam energy this summer for use in simulations.
- Reinstallation of plate 7 with hodoscope counters in the present location of the microscope has some interference issues.
- At the moment, the plate can be mounted about 2 cm above the nominal position. It needs to come down about 1 cm.
- Tim is working on a solution to modify outer covers of the hodoscope scintillators without affecting their performance. If this option is not totally successful, we may have to run without a few counters. (He promised a log entry with this information).
- Software/Calibration (David)
- Meeting tomorrow
- Rory: Responded to David's request for online histograms. More feedback is welcome.
- MWPC Testing
- CPP and NPP Experiment Configuration
- DAQ and Electronic Setup
- Sergey: MWPC crate is operational, but needs fiber connection to be integrated into larger system.
- Beni: LV and HV installed on chambers. Gas is now flowing.
- Need to synchronize the +/- LV channels during ramp up. Hovanes will add a single button to turn both on at the same time
- All horizontal chambers have been tested. One signal (chamber 3, channel #7) has an odd shape, perhaps a reflection. Rory will take a look at log entry
- Signal cables: Crimping tool from JLab has been lent to the vendor. Expect first six cables in about a week. Should receive first samples to check.
- Noise: Beni finds that noise is reduced if the signal connector is grounded to the casing. Working on finding a practical method for this connection.
- Rory: The lack of connection between connector and casing was intentional, following advice from Fernando.
- Other business
- Next meeting
