Difference between revisions of "Π polarizability Meeting Jun 29, 2022"

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== Action Items ==
 
== 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 KHz
+
# <strike> 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 KHz </strike> Changes implemented and included into the new standard CPP configuration.
  
 
== Preliminary Agenda  ==
 
== Preliminary Agenda  ==
Line 72: Line 72:
 
== Minutes ==
 
== Minutes ==
  
''Attending:
+
''Attending: Albert, Alex, Andrew, Beni, David H., Elton, Mark, Simon
 +
 
 +
# Previous CPP meeting: [[%CE%A0_polarizability_Meeting_Jun 22,_2022|Jun 22, 2022]]
 +
# Previous CPP Software meeting: [[Π polarizability Software Meeting May 5, 2022]]
 +
# Announcements
 +
# Action Items
 +
# [https://docs.google.com/spreadsheets/d/1sdluzy7p5vnlhw9AWJHBrYbXKTBet45o4den4zWX9dc/edit#gid=1855021251 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.
 +
#* Empty target running. We discussed the limitation of running at 70 nA for empty target due to the limitation of hodoscope counters at 4.5 MHz. We decided to keep the hodoscope on and run at about 60 nA.
 +
#* Expect to change to empty target before the weekend. Will wait till the trigger file is updated and we can assess the amount of full vs empty target data taken.
 +
#* Mark: Suggests that we do a rate scan to investigate rate dependencies. We decided to add a target-full rate scan later in the run.
 +
# 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).
 +
#* 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
 +
# DAQ and Electronic Setup (Sergey and Beni)
 +
# CPP-NPP Trigger
 +
# MWPCs
 +
#* [https://logbooks.jlab.org/book/hdfmwpc FMWPC Log Book]
 +
#* [https://halldweb.jlab.org/talks/2022/CPP_NPP/ halldweb/talks/CPP_NPP]
 +
# [[CPP and NPP Experiment Configuration]]
 +
# Documentation
 +
# Other business
 +
# Next meeting

Latest revision as of 11:13, 29 June 2022

09:30 EST (JLab time) Weekly Meeting

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Action Items

  1. 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 KHz Changes implemented and included into the new standard CPP configuration.

Preliminary Agenda

  1. Previous CPP meeting: Jun 22, 2022
  2. Previous CPP Software meeting: Π polarizability Software Meeting May 5, 2022
  3. Announcements
  4. Action Items
  5. Spread Sheet with Run List (Albert)
    • List of production runs
    • Allocations for Empty and Amorphous running
  6. Software/Calibration, Simulations
  7. Photon beam / tagger / diamonds
  8. DAQ and Electronic Setup (Sergey and Beni)
  9. CPP-NPP Trigger
  10. MWPCs
  11. CPP and NPP Experiment Configuration
  12. Documentation
  13. Other business
  14. Next meeting

Minutes

Attending: Albert, Alex, Andrew, Beni, David H., Elton, Mark, Simon

  1. Previous CPP meeting: Jun 22, 2022
  2. Previous CPP Software meeting: Π polarizability Software Meeting May 5, 2022
  3. Announcements
  4. Action Items
  5. 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.
    • Empty target running. We discussed the limitation of running at 70 nA for empty target due to the limitation of hodoscope counters at 4.5 MHz. We decided to keep the hodoscope on and run at about 60 nA.
    • Expect to change to empty target before the weekend. Will wait till the trigger file is updated and we can assess the amount of full vs empty target data taken.
    • Mark: Suggests that we do a rate scan to investigate rate dependencies. We decided to add a target-full rate scan later in the run.
  6. 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.
  7. Photon beam / tagger / diamonds
  8. DAQ and Electronic Setup (Sergey and Beni)
  9. CPP-NPP Trigger
  10. MWPCs
  11. CPP and NPP Experiment Configuration
  12. Documentation
  13. Other business
  14. Next meeting