CPP and NPP Run Conditions

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Revision as of 07:25, 28 July 2022 by Elton (Talk | contribs) (Decommissioning / Deinstallation)

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  • CPP and NPP Run Conditions
  • Electron beam energy expected = 11.57 GeV based on the planned Experimental Schedule
  • Microscope will cover the range of [0.391-0.514] of the beam energy or [4.52-5.95 GeV]
  • Hall D solenoid will operate at its nominal field of 1350 A.
  • Use the 750 um PS converter to collect sufficient PS triggers at low rate.
  • Pair Spectrometer magnet will be scaled down by 6/9 = 0.67 of its nominal field (569.4 A = 0.67x849.9 A)
Time estimates for Run Plan
Activity Duration (PAC Days) Duration (hours) Current Target Collimator Radiator Contact Comment
Full target (Production) 20 960 27 nA Pb (0.3 mm) 3.4 mm JD70-103 or JD70-107 Alternate 45, 45, 135, 135 deg diamond configuration (240 M events each) with amorphous data (60 M events)
TOF, CTOF, CDC HV Scans 0.2 10 27 nA - 3.4 mm AMO (1x10-4) Beni, Naomi, Mark Need time to assess data before updating settings. FCAL/BCAL trigger
Empty Target 1.5? 72 50 nA - 3.4 mm JD70-103 or JD70-107 Rory, Ilya, Andrew Take data at full-target current for normalization
Diamond Alignment 0.5? 24 20 nA Pb (0.3 mm) 3.4 mm JD70-103 and JD70-107 Hovanes
Trigger Commissioning 1? 48 100 nA? Pb (0.3 mm) 3.4 mm JD70-103 or JD70-107 Sasha
Lead Shield Alignment 0.2 10 30-100 nA Pb (0.3 mm) 3.4 mm JD70-103 or JD70-107 Ilya
Beam Energy Calibration 0.1? 5 100 nA Pb (0.3 mm) 3.4 mm JD70-103 or JD70-107 Alexandre Collimator Blocking for 5 min, periodically
Straight Track (Solenoid off) 0.5? 24 100 nA? Pb (0.3 mm) 3.4 mm JD70-103 or JD70-107 Simon, Lubomir Ramping magnet takes about a shift.
PS magnet at GlueX nominal current 0.1? 5 27 nA? Pb (0.3 mm) 3.4 mm JD70-103 or JD70-107 Sasha?
TAC Runs 1.5? 72 <2 nA - 3.4 mm AMO (2x10-5) Sasha
All Non-production total 5.6 269 - - - - -

Preparations and Schedule

  1. CPP DAQ/Monitoring Test Spring 2022
  2. CPP Run Coverage Summer 2022

Draft Commissioning Steps

  1. Set Solenoid (standard GlueX) and PS magnet to CPP values (CPP = 2/3 * nominal GlueX).
  2. Setup photon beam operation at 50 nA.
  3. Check microscope and hodoscope operation in new configuration
  4. Align diamond to 6 GeV coherent edge
  5. Check rates in microscope in new position
  6. Harp scans and check photon beam on collimator
  7. Check radiation and backgrounds rates in Hall D with Pb target
    • Check rates and beam stability at 30 nA
    • Check currents and hit distributions in the MWPCs
  8. Preliminary trigger setup to be used during initial checks
  9. Complete a HV scan for the TOF, CTOF and CDC. Adjust voltages accordingly, especially those of the TOF in advance of trigger studies.
  10. Take data for adjustment of the FCAL PMT gains.
  11. Take data for Sean's Detector Checkout
  12. Compare empty vs full target rates
  13. Adjustable Pb absorber (upstream of muon detector)
  14. Commission trigger
    • Charged Trigger (TOF)
    • Neutral Trigger (FCAL/BCAL)
    • Calibration triggers (CTOF, random, PS)
    • Compare empty/full trigger rates
  15. Production
    • Full target
    • Empty target, fraction determined during commissioning.
  16. Special Runs during Production
    • Beam energy calibration (Short, possible daily runs)
    • Regular short runs in raw mode
    • Take a TAC run close to start and one at end of run.
    • PS: Take data at the nominal GlueX setting for reference.
    • Straight track data (solenoid off)

Non-production activities remaining (Jul 27)

  1. Second TAC run
  2. Take a current rate scan on full target later in the run to investigate any rate dependent effects. Do we want to do this? When?

Decommissioning / Deinstallation

  1. The Pb target will be secured upon completion of the experiment. It will be stored either in a safe in the hall if it is activated, or the safe in Hall D conference room if not.
  2. The Pb frame shield will be surveyed while the first stage is still up on the platform
  3. After uncabling of the MWPCs, the chamber cables will be stored along with the chambers in the EEL.
  4. The steel absorbers will be stored inside to prevent corrosion, likely in the Test Lab.
  5. The CTOF scintillators will be stored in the EEL along with the MWPCs. That gets them out of the hall radiation environment and makes them accessible even if Hall D is closed.