Engineering Run

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Person Phone Number
Run Coordinator 9-757 575-7540 (cell)
Physics Division Liaison 9-757 876-1789 (cell)
Run Group C coordinator 9-757 639-6640 (cell)
Shift Expert 5244 or 9-757 329-4846 (cell)
Shift Worker 5126
MCC-OPS 7048
Crew Chief 7045
Crew Chief 9-757 876-3367 (cell)
Program Deputy 9-757 876-7997 (cell)
Engineering on-call 9-757 748-5048 (cell)
Engineering on-call secondary 9-757 897-9060 (cell)
Radcon (needed for target cell swaps) 9-757 876-1743 (cell)
Gate House Guard 5822
Location Phone Number
Hall-B Floor 5165
Hall-B Space Frame 5170, 5171
Hall-B Forward Carriage 5371
Hall-B Counting Room 5245 (Shift1), 5126 (Shift2)
Hall-B Counting Room 5244 (Expert)
Hall-B Gas Shed 7115
System Phone Number On-Call Person
DC (757) 748-5048 (cell) Engineering On-Call
SVT + MM (757) 541-7539 (cell) Yuri Gotra Primary
SVT + MM (757) 753-7769 (cell) Rafo Paremuzyan (secondary)
ECAL (757) 810-1489 (cell) Cole Smith
FTOF/CTOF (757) 344-7204 (cell) Jose Carvajal
CND (757) 344-7204 (cell) Jose Carvajal
HTCC-LTCC (757) 344-7174 (cell) Youri Sharabian
FT (757) 344-1848 (cell) Raffaella De Vita
BAND (757) 310-7198 (cell) Florian Hauenstein
RICH (757) 344-3235 (cell) Valery Kubarovsky
DAQ (757) 232-6221 (cell) Sergey Boiarinov
Slow Controls (757) 748-6922 (cell) Nathan Baltzell
Beamline (757) 303-3996 (cell) Eugene Pasyuk
Pol. Target On-Call (757)-218-2266 (cell) See schedule or call RC
Polarized Target (757) 746-9277 (cell) Chris Keith
Polarized Target (757) 897-1415 (cell) James Maxwell
Polarized Target (757) 871-5374 (cell) James Brock
Target (not used) (757) 822-9586 (cell) Bob Miller Primary
Target (not used) (757) 897-9060 (cell) Denny Insley Secondary
Counting House C x6000
Counting House D x5504

In case of a problem with superconducting magnets call Engineering on-call first, particularly if it is related to cryo.
For all other superconducting magnet problems call magnet group.
Their schedule and phone numbers are posted on the wall next to the Saclay target computer.

Click Here to edit Phone Numbers. Note, you then also have to edit this page to force a refresh.

CLAS12 Engineering Run, Winter 2018
Beam energy 2.1 GeV (1 pass)
Important: Document all your work in the logbook!
Remember to fill in the run list at the beginning and end of each run ( can fill the run list)

RC: Raffaella De Vita

  • (757) 575-7540
  • 9 575 7540 from Counting Room

PDL: Eugene Pasyuk

  • (757) 876-1789
  • 9 876-1789 from Counting Room

  • Note 1: Be very mindful of the background rates in the halo counters, rates in the detectors, and currents in the SVT for all settings to ensure that they are at safe levels.
  • Note 2: At the end of each run, follow the DAQ restart sequence "end run", "abort", "reset", "download", "prestart", "go". After DAQ prestart is complete reboot the scaler IOCs with the command: Note: After each step, make sure it is complete in the Run Control message window. If a roc has crashed, find which one it is and issue a roc_reboot command and try again. Contact the DAQ expert if there are any questions.
  • Note 3: Nominal beam positions: 2C21 (X=0.0 mm, Y=0.0 mm), 2C24 (X=0.0 mm, Y=0.7 mm), 2H01 (X=0.7 mm, Y=-0.5 mm)

Run Plan:

(last update 1/22 - 18:00 am)

  • Once work in the Hall is complete, ramp the solenoid up to -100% (RC or PDL will do it). Once solenoid is at field, ramp torus to +60% (inbending electrons).
  • Ask MCC to ramp the tagger magnet up to prepare for beam tuning.
  • When MCC will inform you that they are ready to send beam, turn most sensitive detectors off including trackers (SVT, MVT, FTT, DC), Central Detectors (CTOF, CND) and RICH: refer to the manuals or call the experts for any questions.
  • <s> Prepare to re-establish beam following the "Establish-physics quality beam" procedure at [1]. Consult with the beamline expert in case of issues.
  • Once beam is tuned to the FC, start data taking at 60% field (negatives inbending) and solenoid to -100% field:
    • Test production run: 10 nA beam current on LH2 target, DAQ configuration PROD (selected by clicking on Configure before the Download), trigger file tr_electron_2gev_lt.trg (selected at the Download), beam position as indicated above; Take 2 hours of data.
    • Special Run #1 (Random): 10 nA beam current on LH2 target, DAQ configuration PROD (selected by clicking on Configure before the Download), trigger file random_2gev_lt.trg (selected at the Download), beam position as indicated above; call Rafayel Paremuzyan (757-753-7769) 30 min. before starting the run, as he will come to the Counting house or connect remotely to check that settings are correct and all trigger information written to the data stream. Take 50 M events.
    • Special Run #2 (Random): 5 nA beam current on LH2 target, DAQ configuration PROD (selected by clicking on Configure before the Download), trigger file random_tr.trg (selected at the Download), beam position as indicated above. Take 50 M events.</s>
    • Once random trigger runs are completed, ask for 5 nA and to set the FSD thresholds on downstream counters to 1000000.
    • Special Run #3 (DC HV scan): 5 nA beam current on LH2 target, DAQ configuration PROD (selected by clicking on Configure before the Download), trigger file tr_electron.trg (selected at the Download), beam position as indicated above; take 3 short runs (20 min.) with different DC HV settings (7,8,8), (9,10,10), (10,11,11) as detailed in Every time the HV settings are changed use the DC HV Monitoring GUI (from the main Epics GUI select DC-> DC HV Monitoring) to check that the HV settings are correct; compare the values displayed in the GUI with what reported in the table on pg. 5 and 6 of the DC manual at [2]. Once completed, set DC HV at the nominal settings (8,9,9).
    • Production: 5 nA beam current on LH2 target, DAQ configuration PROD (selected by clicking on Configure before the Download), trigger file tr_electron.trg (selected at the Download), beam position as indicated above; Take 2 hours runs till 7 am.
    • Special Run #4 (MIPS): at 7 am, 2 nA beam current on LH2 target, DAQ configuration PROD2 (selected by clicking on Configure before the Download), trigger file trg_mips_PCAL.trg (selected at the Download), beam position as indicated above; adjust the beam current to have a trigger rate not greater than 15 kHz and live time not less than 50%); take one hour of data.
    • Production: 5 nA beam current on LH2 target, DAQ configuration PROD (selected by clicking on Configure before the Download), trigger file tr_electron.trg (selected at the Download), beam position as indicated above; Take 2 hours runs untill beam will be terminated for the pass change to 10.6 GeV.
  • While taking data, monitor routinely trigger scalers (make sure all bits in the first column of the table are non-zero, see as an example), live time, monitoring histograms, CED, detector scalers.

Beam Tuning:

  • Whenever preparing to receive beam, make sure the following conditions are established: all CLAS12 detectors are off and target is empty. Turn DC HV off, leaving LV on. For SVT, MVT, FTH and FTT, first turn HV off and then LV off. For any problem, consult with the expert-on-call.
  • Establish beam to the tagger yoke first:
    1. ask MCC to energize the tagger dipole magnet and set the current as needed for dumping the beam in the designated dump on the tagger yoke. MCC will ask you to change (set) the beam delivery mode.
    2. position the "blank" collimator on the beam (this is a collimator block, 30 cm long Ni cylinder, without a hole)
    3. when the tagger magnet is at required setting ask MCC if they are ready to deliver beam to the tagger yoke dump (<=5 nA). It may take ~1 hour for MCC to setup and cleanly transport beam to the tagger yoke dump.
    4. perform harp scans using the wire harp at 2C21 girder and 2C24 (tagger harp). Beam profile, peak position, width and signal/background ratio should be like in and Ask MCC to retune if needed (e.g. beam is too wide or asymmetric or has large tails),repeat the scan after every tune. Iterate to get acceptable beam profile.
  • Send the beam to Faraday Cup dump:
    1. CLAS12 detectors should be OFF, the solenoid magnet current is at 50% its max, torus is at 100%.
    2. ask MCC to degauss and turn the tagger dipole off; while the magnet is being degaussed call the beamline expert (S. Stepanyan) to inform him, you are starting the procedure to send the beam to the Faraday Cup;
    3. position 20 mm collimator on the beam and move "Chromax" screen of the downstream viewer in beam position (if it is not already)
    4. move the beam blocker out: in this configuration beam current readings at 2C24, 2H01 and Faraday Cup should be close.
    5. ask for <= 1 nA, positions, quads settings and rates should be as in; pay particular attention to halo counter rates: if very different from what shown in the link, call MCC and ask them to verify their settings; note that BOM gains were lowered today and rates should be lower (see
    6. make sure beam is stable, beam spot is clearly visible on the Chromax viewer and current does not exceed 1 nA;
    7. repeat harp scans at 2C21, 2C24 (tagger harp) and 2H01: the profile for 2H01 should be as in Make sure you select the proper PMT for the analysis. The profile at 2C21 and 2C24 should be as in the scans performed with beam to the tagger magnet yoke dump. If necessary ask MCC to adjust the beam profile at 2H01 to match the previous scan.

When ready to get beam, turn all beamline devices ON, turn all CLAS12 detectors OFF

General Instructions:

  • For a given beam current, compute the FSD thresholds according to the Establish Physics Quality Beam document. Call MCC to update the values. Contact the beamline expert if there are questions about setting the FSD thresholds.
  • The main lights in the Hall (dome lights) and the Forward Carriage lights are being kept off because of light leaks affecting some of the detectors. If these lights are switched on during an access, they should be switched off when leaving the Hall. Note that the dome lights when switched off cannot be turned back on immediately because they require 10-15 min to cooldown.
  • Do not run more than 60 minutes above 30 nA with 5-pass beam without the beam blocker in front of Faraday cup. Put beam blocker in for long running at high currents for 5 pass operations.
  • Turn DC HV off only for beam tuning; if no beam is available or when beam is stable, keep them on even if you are not taking data.
  • In case of loss of communication with IOCBTARG, follow instructions at
  • With any issue contact On-Call Experts or RC - do not spend more than 15-20 min trying to fix the problem.
  • All jscaler iocs (iocjscalerX) on the health screen (under DAQ tab) must be restarted after every DAQ prestart is completed.
  • Check that no unecessary beamline-related screens are open. This includes particularly the big beamline overview screen, but also and any motor/harp/collimator screens, and ioc health screens.

Every Shift:

  1. Follow run plan as outlined by RC
  2. If any concern about beam stability, ask MCC if orbit locks are on (they should be).
  3. Keep shift summary up to date in HBLOG. Record all that happens.
    • Check on white board all scalers, strip charts and monitoring plots that need to be logged regularly
    • Document any beam condition change and send scaler GUIs to HBLOG
    • Fill out BTA hourly. Click "Load from EPICS" to automatically fill the left side.
    • Fill and submit the shift checklist in the logbook
  4. Perform 2H01A harp scan once per shift or when beam conditions have changed, based on beam monitors (BPMs, halo rates, beam-viewer). During harp scans the HV for DC and HTCC should be OFF.

Every Run:

  1. Log screenshots of:
    • main scaler GUI display
    • Detector occupancy plots
    • Trigger rate gui
    • Beam strip charts