Difference between revisions of "Π polarizability Meeting Jun 29, 2022"
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# Software/Calibration, Simulations | # Software/Calibration, Simulations | ||
#* [https://logbooks.jlab.org/entry/4008656 Log Entry 4008656] (Ilya) Compared target distributions between the "low rate" 100720 and "high rate" 100745. Both runs were taken at about 30 nA. (100745 was a 33 nA but cannot explain the increased rates). | #* [https://logbooks.jlab.org/entry/4008656 Log Entry 4008656] (Ilya) Compared target distributions between the "low rate" 100720 and "high rate" 100745. Both runs were taken at about 30 nA. (100745 was a 33 nA but cannot explain the increased rates). | ||
− | #* | + | #* Several interesting observations: Rate of real tracks and omega signal per PS events is higher for the "low rate" run; TOF triggers that do not fire the FCAL mainly come from downstream of the target. |
+ | #* [[Media:Screenshot 100742.png | Plots from 100742]] (Alex) Showed several plots of pi+pi- mass for runs "low rate" 100720 and "high rate" 100742. | ||
+ | #* Many plots were shown interactively; Alex will post a log entry soon. | ||
+ | #* Most of the excess TOF trigger for the "high rate" run comes from low mass pi+pi- events in the target region. This source seems to be missing in the "low rate" run. These events were selected with (Energy of beam - energy (pi+ + pi-)) < 0.2 GeV, i.e. high elasticity. | ||
+ | #* Much discussion followed and suggestions to both Alex and Ilya to make more plots. | ||
+ | #* Rory: the low-mass pi+pi- peak is possibly due to BH events (either electrons and/or muons). Can check E/p distributions to identify electrons. | ||
+ | #* Rory: An important questions moving forward is to understand this peak at low pi+pi- mass. | ||
# Photon beam / tagger / diamonds | # Photon beam / tagger / diamonds | ||
# DAQ and Electronic Setup (Sergey and Beni) | # DAQ and Electronic Setup (Sergey and Beni) |
Revision as of 12:08, 29 June 2022
09:30 EST (JLab time) Weekly Meeting
REMOTE during Covid-19
Connecting
Join ZoomGov Meeting
https://jlab-org.zoomgov.com/j/1608628791?pwd=bXhtZjdNRi8xeXZqWFh5T1R3TDBFdz09
Meeting ID: 160 862 8791
Passcode: CPP
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
-
Finalize trigger configuration by a) adding a pre-scaled TOF 3 hit trigger b) increase the prescale CTOF trigger to reduce the rate by 2 c) increase the random trigger rate from 100 Hz to 1 KHzChanges implemented and included into the new standard CPP configuration.
Preliminary Agenda
- Previous CPP meeting: Jun 22, 2022
- Previous CPP Software meeting: Π polarizability Software Meeting May 5, 2022
- Announcements
- Action Items
- Spread Sheet with Run List (Albert)
- List of production runs
- Allocations for Empty and Amorphous running
- Software/Calibration, Simulations
- Photon beam / tagger / diamonds
- DAQ and Electronic Setup (Sergey and Beni)
- CPP-NPP Trigger
- MWPCs
- CPP and NPP Experiment Configuration
- Documentation
- Other business
- Next meeting
Minutes
Attending: Albert, Alex, Andrew, Beni, David H., Elton, Mark, Simon
- Previous CPP meeting: Jun 22, 2022
- Previous CPP Software meeting: Π polarizability Software Meeting May 5, 2022
- Announcements
- Action Items
- Spread Sheet with Run List (Albert)
- Elton suggested that we add triggers from empty target running to the spread sheet using columns E and F to tabulate triggers from PARA-135 and PERP-45, and add a new column between F and G (new G) for empty AMO running. Trigger sums for full target are available in a table on the top right. Albert will add a new table to provide sums for the empty target running.
- Software/Calibration, Simulations
- Log Entry 4008656 (Ilya) Compared target distributions between the "low rate" 100720 and "high rate" 100745. Both runs were taken at about 30 nA. (100745 was a 33 nA but cannot explain the increased rates).
- Several interesting observations: Rate of real tracks and omega signal per PS events is higher for the "low rate" run; TOF triggers that do not fire the FCAL mainly come from downstream of the target.
- Plots from 100742 (Alex) Showed several plots of pi+pi- mass for runs "low rate" 100720 and "high rate" 100742.
- Many plots were shown interactively; Alex will post a log entry soon.
- Most of the excess TOF trigger for the "high rate" run comes from low mass pi+pi- events in the target region. This source seems to be missing in the "low rate" run. These events were selected with (Energy of beam - energy (pi+ + pi-)) < 0.2 GeV, i.e. high elasticity.
- Much discussion followed and suggestions to both Alex and Ilya to make more plots.
- Rory: the low-mass pi+pi- peak is possibly due to BH events (either electrons and/or muons). Can check E/p distributions to identify electrons.
- Rory: An important questions moving forward is to understand this peak at low pi+pi- mass.
- Photon beam / tagger / diamonds
- DAQ and Electronic Setup (Sergey and Beni)
- CPP-NPP Trigger
- MWPCs
- CPP and NPP Experiment Configuration
- Documentation
- Other business
- Next meeting