CPP and NPP Run Conditions
From GlueXWiki
- CPP and NPP Run Conditions
- Electron beam energy expected = 11.7 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.
- 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)
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 (90%) with amorphous data (10%) | |
TOF, CDC HV Scans | 0.2 | 10 | 27 nA | - | 3.4 mm | AMO (1x10-4) | Beni, Naomi | 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
Draft Commissioning Steps
- Set Solenoid (standard GlueX) and PS magnet to CPP values (CPP = 2/3 * nominal GlueX).
- 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
- 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
- Preliminary trigger setup to be used during initial checks
- Complete a HV scan for the TOF and CDC. Adjust voltages accordingly, especially those of the TOF in advance of trigger studies.
- Take data for adjustment of the FCAL PMT gains.
- 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: Take some data at the nominal GlueX setting for reference.
- Beam energy calibration
- May need to repeat periodically