Difference between revisions of "Post-thanksgiving period"

Revision as of 09:38, 8 December 2014

Post-thanksgiving period

• Goal: Continue detector/trigger/DAQ checkout

• Prerequisites:

1. Hall D detectors on.
2. Solenoid magnetic field at 800A. Pair Spec. Magnetic field at nominal current (991A, initially 1238A for 5 min for hysteresis purpose). Sweeping magnet on at 190A.
3. Monitoring available in counting room:
   • DAQ screens
     • Procedure for bringing up DAQ
   • online monitoring screens
     • Procedure for bringing up online-monitoring
   • slow control screens and alarm handlers
     • Procedure for bringing up slow control and alarm screens
   • Hall D electronic logbook open
4. 1 cm CH2 target in nominal target position.

• Run plan:

1. re-establish beam done . (If beam is down for a significant time (e.g. a shift), beam need to be re-established following the procedure below.)
   • Initial conditions:
     • Collimator in blocking conditions.
       • Procedure for moving the primary collimator
     • No Radiator.
       • Procedure for moving amorphous radiator
2. Request 50 nA CW beam. done
   1. Check that radiation levels (tagger, collimator cave) are good. done, see log entry 3310576
      • 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, gammas)
   2. Insert 2*10^-5 radiator. Insert 5mm collimator. Ramp-up solenoid to 1200A (call mechanical on-call. If it is during the night, the magnet can wait: we do not need 1200A until the BCal data taking, step 9). Check beam position on the Active collimator. Check that radiation levels are good. Run for 7min to gather enough data for radiation level studies. done, see log entry 3310576
      • 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)
   3. Check the beam position at the profiler.
3. Radiation level studies (0.5h): done, see log entry 3310576
   • Run 7 min without radiator (Call MCC and ask to mask the FSD each time the radiator is moved). Beam current: 50nA
   • Run 7 min with the 10^-4 radiator (Call MCC). Beam current: 50nA
   • Run 7 min with the 3*10^-4 radiator (Call MCC). Beam current: 50nA
   • Insert the 2*10^-5 radiator (Call MCC).
4. 2D scans (x: motor scan, y: beam scan) on the active collimator. Alex Barnes. 2h done, see log entry 3310677
5. Meanwhile, monitor the rate at the active target. Determine the beam position for maximal photon beam transmission. Log the corresponding 4 active collimator values. done, see log entry 3310576
6. Check background level in the pair spectrometer. Alex Somov. 0.5h done, see log entry 3310753
7. DAQ Test Sergei Furletov 4h
   • Increase stability of DAQ system
   • Identify bottlenecks in system and optimize to increase maximum rate
8. Trigger tests. Alex Somov
   • Standard trigger optimization 4h done
   • ST&TOF trigger study 3h
     • TOF trigger study partly done (1h), see log entry 3310760
   • BCal&FCal energy balance trigger study 1h
9. BCal data taking with BCal trigger. (2*10^-5 radiator, 50 nA CW beam) Elton. 2h done
10. Take data at 12 and 24 deg C. (>2 hours each to accumulate statistics and also study stability. Take data with BCAL trigger. Each 3 temperature changes (18->12, 12->24, 24->18) requires an access. Elton. 9h. (We can postponed this step to later to take advantage of an access).
11. High luminosity run for CDC (same luminosity as for April 2015 run, except for the collimator size). (3*10^-4 radiator, 130 nA beam). Call Radcon (in advance, during day) to let them know we will run at high luminosity. Beni. 2h
12. Repeat the above step but with active target now located downstream of the solenoid (requires an access. Can be done later to take advantage of opportunistic access).
13. Staying in the same high luminosity conditions as above, run 1h with 3mm collimator, if the beam position has been stable (~mm drifts at most). Meabwhile, run pair spec DAQ and check its background level. Beni/Alex Somov. 1h
    • Warn MCC that the beam position given by the active collimator is now irrelevant as long as our 3mm collimator is in place. Beam position stability should be checked on AD00.
    • Monitor beam position on AD00 and 5C11 BPMs.
    • Monitor rates at the active target and profiler.
14. Pair Spectrometer studies (Alex Somov)
    • Go the following conditions: 2*10^-5 radiator, 150 nA beam, 5mm collimator. Insert thickest pair spec. convertor
    • Take pair spec. data with TagH and TagM. 3h
    • Run with pair spec. data mixed with GlueX detector data. 0.5h
15. When trigger/DAQ are optimized, take as much data as possible to increase FCal statistics. Manuel Lara. Time: until Dec. 22nd
    • Partly done on 12/04/14 owl shift: 4h of data, see log entry 3310750

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