Post-thanksgiving period
From Hall D Ops Wiki
Tune Photon Beam
- Goal: Continue detector/trigger/DAQ checkout
- Prerequisites:
- Hall D detectors on.
- Solenoid magnetic field at 800A.
- Monitoring available in counting room:
- DAQ screens
- online monitoring screens
- slow control screens and alarm handlers
- Hall D electronic logbook open
- re-establish beam:
- Initial conditions:
- Collimator in blocking conditions.
- No Radiator.
- Initial conditions:
- Request 50 nA CW beam.
- Check that radiation levels (tagger, collimator cave) are good.
- Typical levels are (for radiator retracted, collimator fully blocking, electron beam current 61.50 nA)
- RAD102_P1= 0.170 mrad/hr (tagger area, gammas, between tagger and dump)
- RAD102_P2= 0.480 mrad/hr (tagger area, gammas, near electronics racks)
- RAD102_P3= 0.080 mrem/hr (tagger area, neutrons, near electronics racks)
- RAD101_P1= 0.006 mrad/hr (collimator cave, gamma)
- Typical levels are (for radiator retracted, collimator fully blocking, electron beam current 61.50 nA)
- Insert 2*10^-5 radiator. Insert 5mm collimator. Check beam position on the Active collimator. Check that radiation levels are good.
- Typical levels are (for 2*10^-5 radiator, electron beam current 48 [67.5] nA)
- RAD102_P1= 3.500 [4.10] mrad/hr (tagger area, gammas, between tagger and dump)
- RAD102_P2= 9.900 [12.0] mrad/hr (tagger area, gammas, near electronics racks)
- RAD102_P3= 0.500 [0.75] mrem/hr (tagger area, neutrons, near electronics racks)
- RAD101_P1= 9.700 [14.0] mrad/hr (collimator cave, gammas, 5mm collimator)
- Typical levels are (for 2*10^-5 radiator, electron beam current 48 [67.5] nA)
- Check the beam position at the profiler.
- Check that radiation levels (tagger, collimator cave) are good.
- 2D scans (x: motor scan, y: beam scan) on the active collimator. Alex Barnes. 2h
- Meanwhile, monitor the rate in the active target. Determine the beam position for maximal photon beam transmission. Log the corresponding 4 active collimator values.
- Check background level in the pair spectrometer (Alex Somov) 0.5h
- DAQ Test (TBD) Sergei Furletov
- Trigger tests (Alex Somov)
- Standard trigger optimization 4h
- ST&TOF trigger study 3h
- BCal&FCal energy balance trigger study 1h
- BCal data taking with BCal trigger. (2*10^-5 radiator, 50 nA CW beam) Elton. 2h