Difference between revisions of "CPP and NPP Run Conditions"
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* Electron beam energy expected = 11.55 GeV? based on the planned [https://www.jlab.org/sites/default/files/user-liaison/documents/Web20211122.1.pdf Experimental Schedule] | * Electron beam energy expected = 11.55 GeV? based on the planned [https://www.jlab.org/sites/default/files/user-liaison/documents/Web20211122.1.pdf Experimental Schedule] | ||
* Microscope will cover the range of [0.301-0.514] of the beam energy or [4.57-6.01 GeV] | * 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) | * Pair Spectrometer magnet will be scaled down by 6/9 = 0.67 of its nominal field (569.4 A = 0.67x849.9 A) | ||
Revision as of 07:55, 27 April 2022
- 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)
Activity | Duration (PAC Days) | Current | Target | Collimator | Radiator | Comment |
---|---|---|---|---|---|---|
Full target (Production) | 20 | 27 nA | Pb (0.3 mm) | 3.4 mm | JD70-103 or JD70-107 | Alternate 0/90 deg diamond configuration |
Empty Target | 1.5? | 27 nA | - | 3.4 mm | JD70-103 or JD70-107 | Run at higher current? |
Diamond Alignment | 0.5? | 20 nA? | Pb (0.3 mm) | 3.4 mm | JD70-103 and JD70-107 | |
Trigger Commissioning | 1.3? | 100 nA? | Pb (0.3 mm) | 3.4 mm | JD70-103 or JD70-107 | |
Lead Shield Alignment | 0.1? | 100 nA? | Pb (0.3 mm) | 3.4 mm | JD70-103 or JD70-107 | |
Beam Energy Calibration | 0.1? | 100 nA | Pb (0.3 mm) | 3.4 mm | JD70-103 or JD70-107 | Collimator Blocking for 5 min, periodically |
TAC Runs | 1.5? | <2 nA | - | 3.4 mm | AMO (2x10-5) |
Draft Commissioning Steps
- Setup photon beam operation at 50 nA.
- Check microscope and hodoscope operation in new configuration
- Align diamond to 6 GeV coherent edge
- Check rates in microscope in new position
- Complete a HV scan for the TOF and CDC. Adjust voltages accordingly, especially those of the TOF in advance of trigger studies.
- Optional: Check rates for two collimator configurations (5 and 3.4 mm ) ? Use profiler to stabilize the beam during test.
- 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
- Compare empty vs full target rates
- Adjustable Pb absorber (upstream of muon detector)
- Proposal (Ilya)
- Commission trigger
- Charged Trigger (TOF)
- Neutral Trigger (FCAL/BCAL)
- Calibration triggers (CTOF, random, PS)
- Compare empty/full trigger rates
- PS Magnet
- Set nominal value for CPP = 2/3 * nominal GlueX. Take some data at the nominal GlueX setting for reference.
- Beam energy calibration
- May need to repeat periodically