Post-thanksgiving period

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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:
  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.)
  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, log entry 3312433 and log entry 3312692
    • 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 . Repeat the calibration at higher current: 2*10^-5 radiator, 150 nA. done, see log entry 3314127 .
  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 This needs to be repeated periodically.
  6. Check background level in the pair spectrometer. Alex Somov. 0.5h done, see log entry 3310753
  7. DAQ Test Sergei Furletov 4h Done, see log entry 3310981
  8. Trigger tests. Alex Somov
  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. Take also 2h of FCal 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. done done, see log entry 3313706 .
  12. Readout threshold scan for TagH and TagM. (Beni), 2h. done, see log entry 3313470, but data are not useful because the PS data with converter in were not taken during the test . Repeated with converter in and the PS in the trigger, see log entry 3311192. In the same time, the TagH discriminator threshold scans were done (Nathan Sparks).
  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). done, see log entry 3314229 In the same time, run pair spec DAQ and check its background level. Beni/Alex Somov. 1h done, see log entry 3314009 and log entry 3314104.
    • 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 https://logbooks.jlab.org/entry/3313873
    • Run with pair spec. data mixed with GlueX detector data. 0.5h
  15. Take FDC/TOD data with Solenoid at B=0 (a shift). Done, see entries log entry 3314219, log entry 3314224 and log entry 3314227
  16. When trigger/DAQ are optimized, take as much data as possible to increase FCal statistics. Manuel Lara. Time: until Dec. 22nd
    • Done on multiple instances with either FCal only or FCal+BCal trigger used

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