Revision as of 11:49, 20 January 2016

Meeting General Agenda

Connect Information

To connect from the outside by phone please do the following

1.) To join via a Web Browser, go to the page [1] https://bluejeans.com/660743227.

2.) To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 660743227.

3.) To join via phone, use one of the following numbers and the Conference ID: 660743227.

4.) The moderator code is 8394

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

4.) More information on connecting to bluejeans is available. The old ESNET and SeeVough Information is archived here.

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 199.48.152.152
• Press # to enable the polycom keypad, then enter the meeting id: 660743227 and #
• You may have to unmute the microphone: #*4
• Turn the computer on if needed

Beam and Hall configuration

• Beam energy expected: 12.047 GeV (1.090 GeV/linac and 0.123 GeV for the injector and -0.066 GeV of synchrotron radiation losses.
• Solenoid on at 1200A. Any field changes should be avoided if possible.
• Beam current: CW 5 na-3 μA. 250 MHz frequency. Default current and radiator: 100 nA/1.12·10^-4 R.L.
• Radiators:
  • Goniometer diamond radiators: 4 test diamonds (J1a50 (50 μm), J2a100 (100 μm) S145-S90 (90 μm) and JD70-3 (80 μm)) and 3 test foils (two 10 μm Al foils, and one 100 μm Al foil with a holed 10 μm Al foil pressed on it (3mm hole)).
  • Amorphous
    • 1.5 µm Al (1.7·10^-5 R.L.)
    • 10 µm Al (11.2·10^-5 R.L.)
    • 30 µm Al (33.7·10^-5 R.L.)
    • Possibly a ladder with thiner diamonds (20 μm diamonds) will be installed during second half of the run. To be confirmed.
• Collimator hole: 5 mm diameter and possibly 3.4 mm diameter. We may use a plug to reduce the 5mm hole to 1 or 2 mm in order to commission and use the TAC, to be confirmed.
• Target: LH2 target: cryogenic target

General Information

This document describes the run plan for the Hall D Spring 2016 run.

• Schedule for the Spring 2016 run. (Dates are according to the long term calendar.)
  1. Jan. 28th-Feb. 3rd: Electron beam restoration
  2. Feb. 4th-Apr. 14th: Hall D Spring run.
• Goals for the Spring 2016 run.

1. Beam transport and control commissioning (accelerator responsibility):
   1. Position Fast Feedback: Trent Allison, Brian Bevins. Expected time: 40h.
   2. nA BPM: Trent Allison, Brian Bevins. 8h.
   3. Beam line model test: Todd Satogata). Expected time: 2 h.
   4. Test procedure for fast Active Collimator calibration
2. Continue commissioning of the Hall D equipment (Hall D responsibility):
   1. Trigger: (Alex S).
   2. DAQ (Sergey F).
   3. CDC high voltage scan (Ben. Z.).
   4. Goniometer commissioning at 12 GeV (Hovanes/Paul/Ken)
   5. π⁰ calibration. (Elton S.)
   6. Trigger Level-3 commissioning. (David L.)
   7. Establish absolute photon flux with PS (Sacha) and with TAC (Hovanes)
   8. Check the effect of the quadrupole on the microscope data (Alex. Barnes).
   9. 3.4 mm hole run if polarized beam is established with thin diamonds.
   10. (TRD, in parallel with other tasks)
   11. (Polarimeter (Nathan S.), in parallel with other tasks)

• Expected Staffing and responsibilities:
  • The Run Coordinator (RC, Alexandre Deur Feb. 14th - March 15th, ???? March 15th - March 29th, March 29th - April 13th: ???? ) oversees the commissioning.
  • The Physics Division Liaison (PDL, Benedikt Zihlmann) and Hall D Work Coordinator/Safety Warden (T. Carstens) verify that the proper safety rules are followed.
  • Shifts: 2 persons per shift with at least one of the shift taker has Solenoid training.
• 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.
  • Daily run meetings broadcasted on Bluejeans will occur at 8:45am in the counting house conference room. The Run Coordinator will be responsible for organizing and chairing the meeting.
• Useful links:
  • Accelerator schedule
    • long term calendar
    • Scheduled Accelerator Down (SAD)/Maintenance Calendar
    • http://accboard.acc.jlab.org/
  • Links to previous runplans
    • 10.5 GeV Fall 2014
    • 6 GeV spring 2015
    • 12.05 GeV Fall 2015
  • Links to beam parameters/radiation level monitoring:
    • Last 8-hours plots showing 1-minute, 10-minute, and hourly averages
    • Same but Last 24-hours
    • Same but Last 72-hours
    • Week, month, and quarter (3 months) plots also exist, with similar web addresses.
    • A map of the radiation monitors

Runplan

1. Solenoid tests
   • Solenoid tests have priority.
   • No beam required. Will start as soon as the magnet is cold. May require a long access (8h, day) if the cooling is not finished by the start of the run.
2. Re-establish electron and photon beams.
   • Ion Chamber calibration and Rad. Mon. tests (include optimization of the beam tune).
   • Active collimator calibration.
3. Accelerator Fast Feedback commissioning (10×4h), nA BPM commissioning (2×4h) Optic test (2h), Active Collimator calibration test (2h), and Hall D commissioning
   • Solenoid tests (cont.), priority.
   • FFB commissioning will take ~4h/days for a week to 10 days.
     • Beam need to be well tuned (no tail) in order to allow enough excursion for testing the feedback system, without tripping the ion chambers.
   • FOPT optic test (2h).
   • Microscope alignment (Alex B.) expected time ???
     • Need stable beam of known position (from harp scans).
   • HV scan for CDC (Beni, 4×1h), TOF (in parallel with CDC) and PS coarse counters.
     • Solenoid must be on.
     • 4 CDC voltage setting: 2100V, 2125V, 2050V and 2000V.
   • Hall D trigger test (part of it can be done in parallel with other tasks, including FFB/nA/FOPT work. Alex. S. 2h/day except Feb. 10th-15th)
     • Production trigger optimization (FCal&BCal, PS, FCal/BCal) 5×2h.
     • Test high-rate performance (~100 kHz) 2h.
     • Commissioning triggers 2h/days
       • Assess trigger efficiencies
       • Set-up specific triggers TagH/TagM & ST for PS acceptance and efficiency studies, TAC, ST&FCal&TOF (track enriched trigger) for FDC calibration
   • Hall D DAQ tuning. need dedicated time ???
   • π⁰ calibration. For FCal, needs 1M data, 25% in mode 8, the rest in mode 7). 10^-4RL, 200nA? Expected time for 0.75M events in mode 7 and 0.25 in mode 8???
     • Run overnight. Part of trigger optimization.
   • Goniometer commissioning.
   • Trigger Level-3 commissioning.
   • Run PS with different magnetic field (Alex S., 0h: done in parallel)
4. Hall D run
   • Continue above Hall D tasks if needed, then:
   • Establish absolute photon flux with PS and TAC (Hovanes E., Alex S., (1+2+2?)h×3 + 2h×3)
     • Target should be empty (30min to empty, 30 min to refill).
     • Perhaps install a plug in the 5mm collimator hole to decrease photon flux (1h)? Need to de-install the plug once test is done (1h). Need RadCon presence for work on the beamline (ARM not sufficient).
     • Iterative procedure: 2h/days for 3 days.
     • After successful commissioning of the TAC, do a TAC run every few days (1h run + 1h target empty/fill operation). (for now, assume we will do it 3 times)
   • Physics production data with test diamond and 5 mm hole.
   • Test effect of quadrupole on microscope data.
   • Thin diamond test and production (characterized thin diamonds will be available early March)
     • Install thin diamonds (Install between early and mid-March. 8h but opportunistic: done during beam down time).
     • Establish polarized beam with thin diamond.
     • If polarized beam is succesfuly established, then:
       • Take data with thin diamond and 5 mm hole.
       • Move A.C. to 3.4 mm hole and check beam characteristics with 3.4 mm hole. 1h Need RadCon presence for work on the beamline (ARM not sufficient).
       • Take data with thin diamond and 3.4 mm hole.
   • opportunistic TRD test.
   • opportunistic polarimeter test.
   • Physics data taking (Justin S.)
     • Take regular polarized beam data as done in Spring 2015.
       • Statistics needed for a publication?
       • List systematic factors that need to be under control.

Discussion on performances and problems during the Fall 15 run. Subsystem preparations and goals for the Spring 16 run

Summary of the Fall 15 run, with details on subsystem performances

• DAQ (Sergei)
  • DAQ is ready.

• Trigger (Alex S.)
  • Need to set-up and check main trigger (FCal&BCal&PS).
  • Need to set-up TAC and TagH. Mostly done in parallel to other work, but will need dedicated time.

• Beam line
  • Optics (Alexandre D.)
  • Fast Feedback, nA BPM commissioning (Alexandre D.)
  • Tagger hodoscope (Nathan/Franz)
    • Obtained good data from voltage scan done during Fall 15 run. Can now use lower UV.
    • As of Jan. 13th, 5 counters do not work. They will be replaced
  • Tagger microscope (Alex B./Richard)
    • Fall 15 data allowed to optimized bias voltage. Know thresholds of ADC and discrim. As of of Jan. 13th, need to replace 5-6 SiPM.
  • Goniometer (Hovanes)
  • Active collimator, profiler, flux monitor (Alex B./Hovanes)
  • PS system (Alex S.)
    • Threshold adjustment need for high granularity counter.
    • HV scan needed for coarse counter.
    • Need to calibrate Hall probe (done on Jan. 14th)
    • May want to take data with different PS magnetic field.
  • TRD (Sergei, Lubomir)
  • Polarimeter (M. Dugger/N. Sparks)
    • Adding filtering electronics. Takes one week. Will start on Jan. 20th.
  • Target (Alexandre D.)
    • Target is ready.
  • TAC (Hovanes)
    • Need to wait for tagger trigger to work well before to make TAC plans.
  • Slow control (Hovanes)
    • Slow controls are ready

• Detector systems
  • ST (Mahmoud)
    • When bias voltage are changed, all other running condition should be maintained to insure meaningful comparison.
  • FDC (Lubomir)
    • FDC are ready.
    • No straight track data necessary, unless an opportunity arises. Will then take 4h of data.
  • CDC (Beni)
  • FCAL (Adesh)
  • Bcal (Elton)
  • TOF (Mark)

• Online monitoring (David L.)

• Trigger level 3 (David L.)

• Solenoid (Eugene/Beni)
  • Soonest that the solenoid can be ready for testing: Feb. 1st
  • Interlock tests will necessitate access if the Hall is closed.

• Physics data taking (Justin S.)

• RC duty:
  • February 4th to March 15th: Alexandre D.
  • March 15th - March 29th: ??
  • March 29th - April 13th: ??

• Other topics