Run Coordination Meetings:Winter2024

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Winter 2024 Run

GEM-TRD detector test (March 11 - 14 2024)

Connect Information

To connect from the outside by phone please do the following

1.) To join via ZoomGov: connect Meeting ID: 1613772645 / Passcode 8394

2.) To join via Polycom room system go to the IP Address: ( and enter the meeting ID: 1613772645.

3.) To join via phone, use one of the following numbers and the Conference ID: 1613772645.

4.) The moderator code is 8394

Dial Either +1 408 740 7256 or +1 888 240 2560 for US or Canada

Specific instructions for connecting from JLab's Hall D conference room:

  • Turn polycon on if necessary (do it before turning the computer on)
  • With the polycon, place a call at
  • Press # to enable the polycom keypad, then enter the meeting id: 1613772645 and #
  • You may have to unmute the microphone: #*4
  • Turn the computer on if needed

Meeting General Agenda

Run planning meetings:

Beam and Hall configuration

  • Experiment: Test
  • Beam energy expected:
    • 11.7 GeV
  • Solenoid:
    • OFF (Cooled at 80K)
  • CW Beam:
    • 500 MHz frequency
    • Range: 1-200 nA.
    • Chopper slit: tentatively B
    • Standard current and amorphous radiators on amorphous ladder
      • ~ TBDnA on 1.64 µm Al (1.86·10-5) amorphous radiator
  • Position Slow Lock on or FFB on (FFB doesn't operate below 50nA).
  • Radiators:
    • Amorphous
      • 1.64 µm Al (1.86·10-5 R.L., see study)
      • 10 µm Al (11.2·10-5 R.L.)
      • 30 µm Al (33.7·10-5 R.L.)
  • Tagger quadrupole on (-4.2 A). (Not necessary but as a check-out/good habit.)
  • Collimator hole. Default running: 5.0 mm.
  • Targets:
    • H2 target. Warm empty cell
  • PS converter: 750 µm
  • PS test area:
    • GEM-TRD detector (Lubomir, Sergei)
    • Six GEM detectors (Kondo)
  • Detectors:
    • Off except Tagger hodoscope, PS magnet and PS coarse detectors.

General Information

This document describes the run plan for the Hall D Winter 2024 test-run.

  • Schedule for the run (see Oct. 2023-May 2025 official schedule):
    • March 11th-14th: 3 days for electron beam restoration, photon beam check-out and GEM-TRD test.
      • Expect at most 2 days of beam: March 11: Pass change (priority); and March 13: Maintenance day, ideally to coincide with GEM-TRD gas change to Kr.
      • End of test run: Friday 14th, 7am
  • Accelerator overall plan and priorities: Deliver physics beam to Hall C (3-pass, not 4-pass as in the official schedule).
    • Hall A: off (configuration change)
    • Halls B: off (configuration change). Resume operation on Friday March 15th.
  • Hall D plan
    • Test GEM-TRD using the PS test area (priority. Lubomir P., Sergei F.).
    • Test 6 GEM detectors (Kondo G.)
  • Expected Staffing and responsibilities:
    • The Run Coordinator oversees the run:
      • March - 11-14, 4 days: Alexandre Deur
    • The Physics Division Liaison (PDL) and Hall D Work Coordinator/Safety Warden (S. Spiegel) verify that the proper safety rules are followed. PDL is:
      • PDL: Benedikt Zihlmann
    • Shifts: 2 person shifts: 1 leader focusing on standard shift duty + GEM-TRD specialist. Shift schedule.
  • Coordination Activities:
    • The RC will attend the MCC meetings at 7:45am and 8:00am and the weekly MCC meeting (Wednesday, 1:30pm). The PDL will attend the weekly MCC meeting.
    • Run meetings: broadcasted on Zoom. 8:45am in the counting house conference room. The Run Coordinator will be responsible for organizing and chairing the meeting.


  1. Make sure all radiators (from goni and amorphous ladder) are retracted. Active Col. in blocking position. Profiler retracted. Check that magnets are at their nominal fields.
  2. Verify electron beam quality (assume 1 day)
  3. Establish photon beam (assume 1 day).
    • Ion Chambers trip threshold must be set using the 3 Al. radiators on amorphous radiator ladder)
    • Tune electron beam with radiator retracted
      • Radiator (amorphous and diamond) must be retracted. Collimator should be in blocking position.
        • Typical levels are (for radiator retracted, collimator fully blocking, electron beam current 50 nA)
          • RAD102_P1 ~ 10 mrad/hr (tagger area, gammas, between tagger and dump)
          • RAD102_P2 ~30 mrad/hr (tagger area, gammas, on the ground below the goniometer).
          • RAD102_P3 ~ 0.3 mrem/hr (tagger area, neutrons, near electronics racks)
          • RAD508_P1 < 0.1 mrad/hr (collimator cave, gammas).
          • RAD508_P2 ~ 0. mrad/hr (Hall. Neutrons).
    • Establish good photon beam
    • Make sure tagger quadrupole is on and at -4.2 A. (It can be turned on only once the Hall is in power/beam permit.)
      • Insert 2*10-5 RL radiator. Call MCC and ask to mask the FSD and turn off beam each time a radiator is moved
        • Typical levels are (for 2×10-5 radiator, electron beam current 50 nA)
          • RAD102_P1= 35 mrad/hr (tagger area, gammas, between tagger and dump)
          • RAD102_P2= ~ 50 mrad/hr (tagger area, gammas, on the ground below the goniometer)
          • RAD102_P3= ~2 mrem/hr (tagger area, neutrons, near electronics racks)
          • RAD508_P1= ~10 mrad/hr (collimator cave, gammas).
          • RAD508_P2 < ~ 0. mrad/hr (Hall. Neutrons).
    • Verify beam position and envelope (Hovanes).
      • Ask MCC to set beam position on 5C11b to x=-0.5 mm and y=+1.0 mm.
      • Ask MCC for 5C11 and 5C11B HARP. Then do our radiator HARP scan, see instruction. If technical issues in doing our harp scan arise, then it may be skipped.
      • Insert profiler (no need for masking FSD when an object is inserted in the photon line), run with 1×10-4 radiator and 50 nA. Beam on the profiler should be at x=0.0±0.5cm; y=0.0±0.5cm. If not, inform MCC. Keep monitoring this position; produce a strip chart and log it.
    • Radiation level study (1h): if you feel up to the task, strip chart the five radiation monitors (see above) and log them.
      • Run 5 min without radiator (Call MCC and ask to mask the FSD each time the radiator is moved). Beam current: 50nA. Repeat at 100 nA and 200 nA. There is no need to run the DAQ or stop the beam between each steps: the data are recorded by EPICS. However, the beam need to be off when moving to a different radiator for the next steps.
      • Run 5 min with the 10-4 radiator (Call MCC). Beam current: 50nA. Repeat at 100 nA and 200 nA
      • Run 3 min with the 3*10-4 radiator (Call MCC). Beam current: 50nA. Repeat at 100 nA and 200 nA
    • Inform Richard Jones that we are getting ready to use the Active Collimator, and ask him if he needs to check the Active Collimator with the beam.
      • keep profiler in and beam locked (MCC's duty) on the nominal 5C11b and x=0,y=0 profiler position.
    • Active Collimator calibration. (<0.5h, Richard Jones).
      • re-Insert the 10-4 radiator (Call MCC). Use about 100 nA beam current. This will provide the Act. Col. nominal positions for its high gain values.
      • Insert the 2×10-5 radiator (Call MCC). Use about 50 nA beam current. This will provide the Act. Col. nominal positions for its low gain values.
      • Record on the white board what is the beam position on 5C11b and Active Collimator for both for low and high Act. Col. gain.
      • Once Active Collimator nominal beam position is known, retract profiler and lock the beam (MCC) on the active collimator.
  4. GEM-TRD test (Sergey Furletov, Lubomir Penchev)
    • With good transmission, we expect 8.6kHz for PSC total rate for 100 nA, 2×10-5 Al. radiator, 750 um converter and 5mm colimator hole.
    • Standard configuration: 2×10-5 Al. radiator, TBD nA (50nA<I<200nA)
      • Start with Argon/CO2 for checkout (About 2 shifts). Then switch to krypton. Gas change: 5-6h. Run with Kr until the end of the run).
      • Switch to krypton: Gas change: 5-6h. Remote procedure, no need for access
      • Run with Kr until the end of the run. There will be 8 Rapid Access of about 1h each (15min actual work, 45min access procedure/overhead) to switch to various TRD radiators.

Hall D situation room (current run plan)

Hall D counting room white board

Accelerator status

Hot Checkout

To be completed by March. 8th

100% ready ; 0% checked ; 0% not ready

Readiness for Winter 2024 run

  • Target and most detectors to be masked.
    • Need to be under vacuum
  • Beam line
    • Collimator Motion (Hovanes)
    • Active collimator detectors(Richard)
    • Profiler (Hovanes)
      • Low voltage problem (Solved). Need to find front plate. (A new plate was machined)
    • Halo monitors (Hovanes)
    • Slow control (Hovanes).
    • TPol converter motion (Hovanes) .
    • Radiation monitors (A. Deur)
    • x-ray W shield (Tim/Lubomir/Justin).
  • Detector systems
    • PS coarse counters
    • Hodoscope
  • RSAD and ESAD Safety documents (Lubomir/Beni):
  • Phones
    • System experts should start looking for their phone and charger.
    • System experts should have found their on-call phones by now and should start charging them.
    • System experts should start carrying their (charged) phone.
  • Hall Status/safety (Tim/Scott)
  • Other topics?

Live Camera Feeds from the Four Counting Houses

  1. These feeds SHOULD be open and visible at all times from one of the monitors in each of the counting houses. (currently this is not working; we should post instructions how to establish this connection. J.R.)
  2. Management cautions AGAINST opening them from other locations or offsite, out of concern for available bandwidth.

Running Shifts Remote