Difference between revisions of "Tune Photon Beam"

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(Tune Photon Beam)
 
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#** <span style="color:#ff00ff">Procedure to check rates </span>
 
#** <span style="color:#ff00ff">Procedure to check rates </span>
 
#*  Run photon beam <span style="color:#ff00ff">(time estimate: 1 hour ???)</span> <math>\Box</math>
 
#*  Run photon beam <span style="color:#ff00ff">(time estimate: 1 hour ???)</span> <math>\Box</math>
'''End Initial photon beam and detector checkout '''
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'''End Initial photon beam and detector checkout'''
  
 
* [https://hdops.jlab.org/wiki/index.php/One_Week_Pause_in_Running '''One week pause in running for Tagger electronic reinstallation and data analysis.''']
 
* [https://hdops.jlab.org/wiki/index.php/One_Week_Pause_in_Running '''One week pause in running for Tagger electronic reinstallation and data analysis.''']

Latest revision as of 16:45, 14 August 2014

Main Page

Tune Electron Beam

Tune Photon Beam

  • Goal: Tune the photon beam to go through the collimator, the experimental target area, and into the photon beam dump.
  • Expected Schedule:
    • Oct 4 - Oct 5 (Initial photon beam and detector checkout): 2 days
    • Oct 6 - Oct 11 (re-install tagger electronics. Tagger Hall and Hall D open): 6 days
    • Oct 12 - Oct 31 (Finalize photon beam commissioning. Detector commissioning): 20 days


  • Responsibility: HallD, Accelerator, RadCon.
  • Priority: Most activities are High, but includes Moderate and Low priority activities.
  • Prerequisites:
  1. Tagger hall equipment remain removed. \Box
  2. Hall D controlled quadrupole MQPAD00 remained turned off. \Box
    • Responsibility: MCC
  3. Hall D: Detectors turned off. Exceptions: Profiler, possible BCAL, outer rings of the FCAL \Box
  4. Monitoring available in counting room:
    • control screens \Box
    • alarm handlers \Box
    • relevant MCC screens \Box
    • Procedure for bringing up control/MCC/alarm screens
    • System expert: David Lawrence.
  5. Scaler acquisition operational for rate azimuthal asymmetry monitoring and initial detector study. \Box
  6. Collimator: remains in blocking position (similar to the electron beam tune phase). \Box . The motion must be calibrated. \Box
    • System expert: Hovanes Egiyan.
    • Procedure for moving primary radiator
  7. First profiler installed in the Collimator Cave, surveyed in order to find the position of the nominal beam center \Box
  8. Second profiler installed in front of photon beam dump, surveyed. \Box
  9. Active Collimator operational. \Box
    • System expert: Richards Jones
    • Procedure for monitoring beam position with the Active collimator
  10. Pair spectrometer field on, converter retracted. \Box
    • System expert: Alexander Somov
    • Procedure for turning on Pair Spectrometer field
    • Procedure for inserting/removing converters
  11. Solenoid on with quench-safe current ~300A.
    • System expert: Yi Qiang \Box
    • Procedure for monitoring and controlling Soleinoid current
  12. No target in place (air and material along the beamline makes a few R.L.).


Activities

  • First period: Initial photon beam and detector checkout)
  1. (High) Produce acceptable photon beam
    • Re-establish the CW electron beam 50 nA to the Tagger Dump (Accelerator) (time estimate: ???) \Box
    • Insert the 1.7·10-5 R.L. \Box (time estimate: 5 min) \Box
      • System expert: Hovanes Egyian
      • Procedure for inserting radiator
    • Check the radiation levels in the Tagger Hall and the Collimator Cave \Box (time estimate: 10 min) \Box
      • System expert: Alexandre Deur (CARMS)/Hovanes Egyian (halo counters)
      • Procedure to monitor CARMs
      • Procedure to monitor Halo Counters
  2. (High) Tune photon beam on its nominal position at the Primary radiator location
    • Using the first Profiler find the beam center position with respect to the nominal position (time estimate: ???) \Box
      • System expert: Hovanes Egyian
      • Procedure for getting beam position with first profiler
    • Adjust photon beam position while keeping e- beam centered on tagger dump. Obtain a first determination of the accelerator scale. (time estimate: ???)
      • Ask MCC to move the beam to the nominal position, using the last e- beam line corrector. \Box
      • Calibrate the accelerator scale for x and y. That is, find the relation between the corrector currents and beam position at the profiler location. Obtain this information from MCC and log it in the Electronic logbook. This provides a rough accelerator scale. The fine one will be provided by the Active Collimator. \Box
      • Monitor that the electron beam position at the Tagger dump remains acceptable \Box
      • Procedure to check that e- beam is centered on Tagger dump
      • Keep monitoring radiation levels in the Tagger Hall and the Collimator Cave \Box
    • Check the electron beam position at the Dump using the second Beam Profiler \Box
      • System expert: Hovanes Egyian
      • Procedure for getting beam position with beam dump profiler
  3. (High) Active collimator calibration (time estimate: ???)
    • Move the collimator 5 mm hole in X, ±30 mm around the center in order to calibrate the Active Collimator X-response. Use 5mm step size. Leave the collimator in the nominal position (0.5 mm hole at the nominal center) \Box
      • System expert: Richard Jones/Hovanes Egyian
      • Procedure for moving the primary collimator
      • Procedure for reading beam X-position from the Active collimator
    • (Moderate) If the Active Collimator data provides a better position accuracy - move the beam in X accordingly (time estimate: ???) \Box
    • (High) Ask MCC to move the beam in X ±10 mm around center. Use 2mm step size. Verify that the beam X-position from the Active Collimator matches \Box
    • (High) Ask MCC to move the beam in Y ±10 mm around center. Use 2mm step size. calibrate the Active Collimator response \Box
    • (Moderate) If the Active Collimator data provides a better position accuracy - move the beam in Y accordingly \Box
  4. (High) measure the beam position with the Pair Spectrometer's harp (time estimate: ???)
    • Verify that the pair spectrometer magnet is on at nominal field (1.8T). time estimate: 5 min. \Box
      • System expert: Alexandre Somov
      • Procedure for monitoring pair spectrometer B-field
    • Turn on the low-granularity PS counters \Box , DAQ \Box and controls \Box (time estimate: ???).
      • Procedure to turn on PS low-granularity detectors
      • Procedure to turn on PS DAQ
      • Procedure to turn on PS controls
    • Install a PS foil converter (time estimate: 5 min) \Box
      • Procedure to insert foil converter
    • Measure the rate (time estimate: ???) \Box
      • Rate read from DAQ window?? Expected rate? How close should we be?
    • Using the PS wire scanner, measure the position of the beam spot at the converter (time estimate: 10 min) \Box
      • Procedure to extract beam position at scanner
    • (High) Insert a PS foil converter, turn the PS detectors on and start taking data - keep the PS running (time estimate: 5 min, then parasitic) \Box
  5. (High) GlueX detector checkout
    • Set the solenoid current to 1000 A (time estimate: 2 hours) \Box
      • System expert: Yi Qiang
      • Procedure for monitoring and controlling Soleinoid current
    • (High) Turn on the detectors one by one
    • Turn BCAL detector on slowly. Check scaler rates. Monitor the rates and background levels. (time estimate: ???) \Box
      • System expert: Elton Smith
      • Procedure for turning on BCal
      • Procedure to check rates
    • Turn Start Counter detector on slowly. Check scaler rates. Monitor the rates and background levels. (time estimate: ???) \Box
      • System expert: Mark Ito
      • Procedure for turning on Start Counter
      • Procedure to check rates
    • Turn FCAL detector on slowly. Check scaler rates. Monitor the rates and background levels. (time estimate: ???) \Box
      • System expert: Manual Lara
      • Procedure for turning on FCal
      • Procedure to check rates
    • Turn TOF detector on slowly. Check scaler rates. Monitor the rates and background levels. (time estimate: ???) \Box
      • System expert: Mark Ito
      • Procedure for turning on the TOF
      • Procedure to check rates
    • Turn CDC detector on slowly. Check scaler rates. Monitor the rates and background levels. (time estimate: ???) \Box
      • System expert: Benedikt Zihlmann.
      • Procedure for turning on CDC
      • Procedure to check rates
    • Turn FDC detector on slowly. Check scaler rates. Monitor the rates and background levels. (time estimate: ???) \Box
      • System expert: Lubomir Pentchev
      • Procedure for turning on FDC
      • Procedure to check rates
    • Run photon beam (time estimate: 1 hour ???) \Box

End Initial photon beam and detector checkout

  • Second period: Equipment commissioning with photon beam
  1. (High) Control access: move the Profiler to the location in front of the Solenoid (Hall D)
  2. (High) Re-establish the beam and measure the position at the Profiler (Hall D)
  3. (High) Compare the beam position measurements. Consider moving the collimator from the nominal position if deviations of >5 mm are observed (Hall D)
  4. (High) Re-calibrate the Active Collimator in X (use the slide) and Y, without the Profiler in front (Hall D).
  5. (High) Move the collimator 5 mm hole in X, ±30 mm around the center in order to calibrate the Active Collimator X-response. Leave the collimator in the nominal position (0.5 mm hole at the nominal center) (Hall D)
  6. (Moderate) Request control access, rotate the Active collimator by 90 degree. To rotate collimator should take about 5min. Accessing the Hall, leaving it and requesting beam should take 1h. Assumed total time: 2h. (Hall D)
  7. (Moderate) Move the collimator 5 mm hole in X, ±30 mm to calibrate the Active Collimator Y-response. Leave the collimator in the nominal position (0.5 mm hole at the nominal center) (Hall D)
  8. (Moderate) If the Active Collimator data provides a better position accuracy - move the beam in Y accordingly (Hall D/Accelerator)
  9. (High) Turn on the Start Counter (ST). Check the rate asymmetry (Hall D)
  10. (Moderate) Move the collimator ±10mm and check the rates on the ST (Hall D)
  11. (High) Set the solenoid current to 1000 A (Hall D)
  12. (High) Turn on the detectors one by one from the periphery to the center monitoring the rates without and with the beam (Hall D)
  13. (High) Control Access: install the cup target (2mm and 7mm thick) into the central position in Z (Hall D)
  14. (High) Re-establish beam (Accelerator)
  15. (High) Verify the standard BCAL vs FCAL trigger (timing and thresholds) - about 4h (Hall D)
  16. (High) Take 1 shift of data (Hall D)
  17. (Medium) Measure the rates and radiation levels with the 11·10-5 R.L. radiator

Collect Beam Data for Detector Checkout

Optimize Detector Settings

Drift Chamber Alignment

Collect More Regular Data