CPP and NPP Run Conditions

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  • CPP and NPP Run Conditions
  • Electron beam energy expected = 11.55 GeV? based on the planned Experimental Schedule
  • Microscope will cover the range of [0.301-0.514] of the beam energy or [4.57-6.01 GeV]
  • Hall D solenoid will operate at its nominal field of 1350 A.
  • 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 Comment
Full target (Production) 20 960 27 nA Pb (0.3 mm) 3.4 mm JD70-103 or JD70-107 Alternate 0/90 deg diamond configuration
TOF, CDC, FCAL HV Scans 1.5? 72 27 nA - 3.4 mm JD70-103 or JD70-107 Need time to assess data before updating settings
Empty Target 1.5? 72 27 nA - 3.4 mm JD70-103 or JD70-107 Run at higher current?
Diamond Alignment 0.5? 24 20 nA Pb (0.3 mm) 3.4 mm JD70-103 and JD70-107
Trigger Commissioning 1.3? 63 100 nA? Pb (0.3 mm) 3.4 mm JD70-103 or JD70-107
Lead Shield Alignment 0.17 8 100 nA? Pb (0.3 mm) 3.4 mm JD70-103 or JD70-107
Beam Energy Calibration 0.03? 1.5 100 nA Pb (0.3 mm) 3.4 mm JD70-103 or JD70-107 Collimator Blocking for 5 min, periodically
Straight Track (Solenoid off) 0.03? 1.5 100 nA Pb (0.3 mm) 3.4 mm JD70-103 or JD70-107
TAC Runs 1.5? 72 <2 nA - 3.4 mm AMO (2x10-5)

DAQ/Monitoring Test Preparations

  1. CPP DAQ/Monitoring Test Spring 2022

Draft Commissioning Steps

  1. Setup photon beam operation at 50 nA.
  2. Check microscope and hodoscope operation in new configuration
  3. Align diamond to 6 GeV coherent edge
  4. Check rates in microscope in new position
  5. Complete a HV scan for the TOF and CDC. Adjust voltages accordingly, especially those of the TOF in advance of trigger studies.
  6. Take data for adjustment of the FCAL PMT gains.
  7. Optional: Check rates for two collimator configurations (5 and 3.4 mm ) ? Use profiler to stabilize the beam during test.
  8. Check radiation and backgrounds rates in Hall D with Pb target
    • Check rates and beam stability at 30 nA
  9. Check currents and hit distributions in the MWPCs
  10. Compare empty vs full target rates
  11. Adjustable Pb absorber (upstream of muon detector)
  12. Commission trigger
    • Charged Trigger (TOF)
    • Neutral Trigger (FCAL/BCAL)
    • Calibration triggers (CTOF, random, PS)
    • Compare empty/full trigger rates
  13. PS Magnet
    • Set nominal value for CPP = 2/3 * nominal GlueX. Take some data at the nominal GlueX setting for reference.
  14. Beam energy calibration
    • May need to repeat periodically