Π polarizability Meeting Mar 9, 2022
- 1 Meeting Time And Location
- 2 Connecting
- 3 Action Items
- 4 Preliminary Agenda
- 5 Minutes
- 5.1 Action Items
- 5.2 Previous CPP meeting: Mar 2, 2022
- 5.3 Previous CPP Software meeting
- 5.4 Announcements
- 5.5 Action Items
- 5.6 CPP voltage controls
- 5.7 Plan for diamond simulations
- 5.8 Software/Calibration
- 5.9 MWPC Testing
- 5.10 CPP and NPP Experiment Configuration
- 5.11 CPP-NPP trigger
- 5.12 DAQ and Electronic Setup
- 5.13 FCAL Readout Re-Configuration
Meeting Time And Location
09:30 EST (JLab time) Weekly Meeting
REMOTE during Covid-19
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Meeting ID: 160 862 8791
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- Check with Sasha on steps for "replay"
- Decide on any work to be done on the TAC (Rory)
- Work with Justin to create the appropriate translation tables for the scalers (Beni)
- Check with Chris about sensor voltage for the LV supplies (Beni)
- Update the database with the microscope translation table (Elton)
- Previous CPP meeting: Mar 2, 2022
- Previous CPP Software meeting: Π polarizability Software Meeting Mar 3, 2022
- Action Items
- CPP voltage controls (Hovanes)
- Plan for diamond simulations (Richard)
- MWPC Testing
- CPP and NPP Experiment Configuration
- CPP-NPP trigger
- DAQ and Electronic Setup (Sergey and Beni)
- Other business
- Next meeting
Attending: Alex Austregesilo, Mark Dalton, Albert Fabrizi, Sergey Furletov, David Hornidge, Mark Ito (chair), Nikhil Kalra, Ilya Larin, Rory Miskimen, Andrew Schick, Simon Taylor, Beni Zihlmann
There is a recording of this meeting (Passcode: 2ttBdP*.) on the ZoomGov website.
Check with Sasha on steps for "replay"
- Ilya, as previously reported, has looked at the random trigger data Sascha Somov took at the end of the SRC runs. He sees rates about 5% above what was expected from previous tests.
- Sergey reported that Sascha has been unable to do further tests on the TOF trigger due to interference with the on-going CDC cosmic tests. Sergey will confirm this and see if there are any pieces of the work that can proceed despite the cosmic run.
Decide on any work to be done on the TAC
Rory reviewed the email exchange he had with Sascha on the TAC. We agreed that it might be better to use the CCAL as a total absorption counter since that was the last system that was used successfully in the Hall, but mechanical interference with the muon chambers is an issue. One idea would be to mount the CCAL on the stand for the TAC. We did not know if this is anywhere near feasible or not.
Rory will ask Tim if he is having a CPP Design meeting tomorrow (Thursday). If so we can discuss this idea there.
Other Action Items
- Work with Justin to create the appropriate translation tables for the scalers (Beni). No progress to report.
- Check with Chris about sensor voltage for the LV supplies (Beni). No progress to report.
- Update the database with the microscope translation table (Elton). No progress reported.
Previous CPP meeting: Mar 2, 2022
We looked over the minutes from last week's meeting.
Mark mentioned that he is in the process of putting together a new version set with the changes that Simon has put in for the FWMPCs, including the adjustment Richard Jones requested for backward compatibility.
Rory characterized Mark I. showing up for only the last few minutes of the meeting as a "tactical error." Mark concurred.
Previous CPP Software meeting
We reviewed the minutes from the meeting on March 3rd without significant comment.
Mark I. has a new dog. His name is Charlie. He announced his presence at the meeting. (Charlie announced his presence himself, that is.)
We reviewed them earlier, remarks above.
CPP voltage controls
No report given.
Plan for diamond simulations
Richard will do the study based on data from the Canadian light source. This will provide guidance for Hovanes Egiyan about where good spots on the diamond might be.
No report given.
Beni re-capped the cable situation.
- Low-voltage cables: all ready to be installed.
- High-voltage cables: cables ready to be installed. Break-out box still needed. Chris Stanislav is working on that.
- Signal cables: only six on hand. The complete set was due a month ago. The manufacturer reports that they received the input materials two weeks ago. They are being made now and should be delivered by the middle to end of this month.
In the mean time, the six cables can be moved from chamber to chamber to look at noise levels in the Hall.
CPP and NPP Experiment Configuration
Mark I. reminded us to fill in relevant configuration information on the wiki page.
Discussed earlier in the meeting.
DAQ and Electronic Setup
Part of discussion on MWPC Testing, above.
FCAL Readout Re-Configuration
Mark D. reported on an idea, proposed by proponents of PrimEx, to do a gain-equization exercise on the FCAL. In preparation for this they propose to reduce gains ab initio on all PMTs to reduce the spread in gains as well as bring lowest-gain PMTs off from their current settings at the maximum voltage. To offset this change they prose halving the voltage range covered by the FADCs on all channels from 2 V to 1 V. The proposal is to do this during the CPP run since there will not be time to go through the exercise during PrimEx (which follows directly after CPP).
Mark D. described an alternate plan where the lowest-gain PMTs get replaced so that those channels can be run at a voltage less than the maximum.
Those at the meeting were not enthusiastic about performing such a large change (corresponding the PrimEx-proposed plan) in the middle of the already short CPP/NPP running. In particular this would be a new configuration for the FCAL energy trigger (which is based on the FADCs) when the NPP experiment depends on it critically.