Π polarizability Meeting Jan 19, 2022
- 1 Meeting Time And Location
- 2 Connecting
- 3 Action Items
- 4 Preliminary Agenda
- 5 Minutes
- 5.1 Action Items
- 5.2 Make a pull request for hdds
- 5.3 Review CPP test run for rates and check with Sasha on steps for "replay"
- 5.4 Check with Hovanes and Alexandre on using JD103 diamond
- 5.5 Check that Rory's grounding suggestions do not deteriorate the performance of Arwen using cosmics
- 5.6 Microscope move (in progress)
- 5.7 PID + AI
- 5.8 CPP and NPP Readiness Review
- 5.9 CPP and NPP Experiment Configuration
- 5.10 Electronic Configuration
- 5.11 Software consolidation
- 5.12 Next meeting
Meeting Time And Location
09:30 EST (JLab time) Weekly Meeting
REMOTE during Covid-19
Join ZoomGov Meeting
Meeting ID: 160 862 8791
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 email@example.com Join by H.323 126.96.36.199 (US West) 188.8.131.52 (US East) Meeting ID: 160 862 8791 Passcode: 112160
- Generate MC samples of pi+pi- (Elton and Andrew)
- Make a pull request for hdds (Simon)
- Review CPP test run for rates (Ilya) and check with Sasha on steps for "replay"
- Check with Hovanes and Alexandre on using JD103 diamond (Elton)
- Check that Rory's grounding suggestions do not deteriorate the performance of Arwen using cosmics (Beni)
- Previous CPP meeting: Jan 12, 2022
- Bluejeans being phased out between now and end of January. New system will be ZOOM.
- Action Items
- CPP-NPP trigger
- Microscope move (in progress)
- Software/Calibration for CPP (David, Alex and Sean)
- PID + AI
- Data for AI (Andrew)
- CPP and NPP Readiness Review
- MWPC Testing
- CPP and NPP Experiment Configuration
- Electronic Configuration (Beni)
- hdgeant4 updates (Mark)
- Software consolidation (Simon)
- GlueX Data Analysis
- CPP Simulations
- Other business
- Next meeting
Present: Alex Austregesilo, Albert Fabrizi, David Hornidge, Mark Ito (chair), Nikhil Kalra, Ilya Larin, David Lawrence, Rory Miskimen, Andrew Schick, Simon Taylor, Beni Zihlmann
There is a (partial) recording of this meeting on the ZoomGov website. The passcode is !&C^z71c
We reviewed the action items.
Generate MC samples of pi+pi-
David L. reported that he and Andrew have put together a directory on the work disk,
containing three directories at present:
BHgen_electron_positron BHgen_muons gen_2pi_primakoff
There are samples of generated events in each of these directories that can be used for studies and for benchmarks of future CPP reconstruction and analysis code.
Make a pull request for hdds
Simon reported that Elton merged the pull request last week. In addition he got new numbers for the MWPCs from Stephanie Worthington and has put the updated geometry into the CCDB.
Review CPP test run for rates and check with Sasha on steps for "replay"
Ilya showed slides on his first look at the trigger test data taken at the end of the SRC run. He is having trouble analyzing the data. Beni and David will have a look to see if they can retrieve the trigger bits from the events. See his slides for more details.
Beni also mentioned that when he balanced the gains for the TOF recently, the average gain was a bit higher than before. This effectively lower energy threshold may account for the increase in rate that Ilya saw.
Check with Hovanes and Alexandre on using JD103 diamond
Rory reported on the recent email exchange that Elton Smith initiated. It looks like the only option we have at this point is to use the JD70-103 diamond. Tim sent around a photo showing it on the goniometer stage. The consensus is that the the coherent edge from this diamond may not be very sharp, but that it can provide adequate polarization to do the experiment. Richard Jones has suggested a calculation where data from a run at the light source is convolved with a typical electron beam profile to calculate the polarization we expect. Rory will follow up with Richard on what is involved in doing this calculation.
Check that Rory's grounding suggestions do not deteriorate the performance of Arwen using cosmics
Beni reported on activities with the test set up in the EEL. On earlier in the week he got the gas turned on and the DAQ system running. We have been taking data since yesterday morning at about 20 Hz. He sees nice signals in the monitoring plots. Next Wednesday we may need to change the gas bottle. One mystery: he is not seeing action on the output bubbler.
Microscope move (in progress)
No one has heard any news from the UConn crew. The consensus was that this should be interpreted as good news.
PID + AI
David ran the 10 k $pi;$pi; events through his machinery to produce input for Nikhil to chew on. This happened just yesterday.
CPP and NPP Readiness Review
Final certification of readiness has been granted by Physics management.
We skimmed the CPP and NPP Experiment Configuration.
Beni reported that the cutting of the cable trays on the forward platform was underway when he was in the Hall yesterday.
Beni gave us an update on electronics for the chambers and the new scintillators.
- There are plenty of FADC channels for the eight PMTs
- There are also lots of discriminator channels available.
- TDCs are an issue
- They need an additional connection to the trigger module[?].
- The bottom CAEN HV mainframe has four slots for the DIRC. The plan is to use two of these for chamber HV (requires board replacement) and the other two for the scintillators.
- Nick Sandoval has test stands appropriate for both high and low voltage.
Rory brought up the idea of a scintillator-only trigger that could be used for diagnostics for the chambers. Such a trigger might yield a nice sample of muon pairs. Beni noted that there was already a NIM crate on the forward carriage that could be used to form a front-panel trigger. Though not simple, we thought that it was within the realm of possibility and the idea should be explored further.
Simon submitted a pull request to merge the CPP branch of halld_recon onto the master. Sean Dobbs had several suggestions and Simon is responding to them. For details, see the conversation on GitHub.
We decided that we should have one. ;-)