Optimize Detector Settings

• Goal: Finalize the photon beam commissioning. Verify optimal settings for detectors.
• Responsibility: HallD
• Expected Schedule:
  • Nov 03 - Nov 05 : 2 days
• Conditions:

1. Hall D controlled quadrupole MQPAD00 remained turned off. $\Box$
   • Responsibility: MCC
2. 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.
3. Tagger hall equipment in place and operating. $\Box$
4. Beam 50nA CW
5. Radiator is 1.7 10^-5.$\Box$
6. Pair spectrometer field on, converter inserted $\Box$
   • System expert: Alexander Somov
   • Procedure for turning on Pair Spectrometer field
   • Procedure for inserting/removing converters
7. Collimator hole is 5mm.$\Box$
8. Solenoid on at 300A.$\Box$
9. 1st Profiler in front of the Solenoid and surveyed. 2nd profiler remains in front of beam dump.$\Box$
10. GlueX detectors are on.$\Box$
11. No target.$\Box$

• Activities

1. Re-establish the beam and measure the position at the:
   • Tagger Dump (electron beam) $\Box$
     • Procedure monitoring beam position at Tagger dump
   • Active collimator $\Box$
     • System expert: Richard Jones/Hovanes Egyian
     • Procedure for reading beam position from the Active collimator
   • 2 Profilers (Hall D).$\Box$
     • System expert: Hovanes Egyian
     • Procedure for getting beam position with first profiler
   • Pair Spectrometer harp (Hall D).$\Box$
     • System expert: Alexander Somov
     • Procedure to extract beam position at scanner
2. Compare the beam position measurements. Consider moving the collimator from the nominal position if deviations of >5 mm are observed $\Box$
3. Re-calibrate the Active Collimator in X (use the slide) and Y, without the Profiler in front. $\Box$
   • Move the collimator 5 mm hole in X, ±30 mm around the center in order to calibrate the Active Collimator X-response. Use 2 mm step size. Leave the collimator in the nominal position (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
   • Recalibrate x-scale of the Active Collimator $\Box$
   • Verify that the motion moves the beam spot at the profilers, while monitoring rates on pair spectrometer for scrapping. $\Box$
   • If the Active Collimator data provides a better position accuracy - move the beam in X accordingly (time estimate: ???) $\Box$
   • 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 $\Box$
   • Ask MCC to move the beam in Y ±10 mm around center. Use 2mm step size. calibrate the Active Collimator response $\Box$
4. Verification of the y-scale calibration for the Active collimator. $\Box$
   • 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. $\Box$
     • System expert: Richard Jones
     • Procedure for rotating the primary collimator
   • Move the collimator 5 mm hole in X, ±30 mm to calibrate the Active Collimator Y-response. Leave the collimator in the nominal position (5 mm hole at the nominal center) $\Box$
   • If the Active Collimator data provides a better position accuracy - move the beam in Y accordingly $\Box$
5. Turn on the detectors to check for azimuthal asymmetries $\Box$
   • 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
6. Set the solenoid current to 1000 A and check rates (time estimate: 2h) $\Box$
   • System expert: Yi Qiang
   • Procedure for monitoring and controlling Soleinoid current
7. Move the collimator ±10mm and check the rates on the Start Counter $\Box$
8. Minimize possible azimuthal asymmetries by adjusting the collimator or target assembly $\Box$
9. Control Access: install the cross target into the central position in Z (time estimate: 1h) $\Box$
   • System expert: Alexandre Deur
   • Procedure installing solid target
10. Re-establish beam
11. Verify the standard BCAL vs FCAL trigger (timing and thresholds) - about 4h
12. Take one shift of data. Reconstruct target profile (8h) $\Box$
13. Establish neam purity. $\Box$
    • Remove the radiator (5 min). $\Box$
      • System expert: Hovanes Egyian
      • Procedure for inserting radiator
    • Run with radiator off.

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