Engineering Run

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Role Phone Number
Hall B Run Coordinator (757) 575-7540 (cell)
Hall B Physics Division Liaison (757) 876-1789 (cell)
MCC 7048
Crew Chief 7045
Crew Chief (757) 876-3367 (cell)
Program Deputy (757) 876-7997 (cell)
Radcon (757) 876-1743 (cell)
Gate House Guard 5822
Location Phone Number
Hall B Floor 5165
Hall B Space Frame 5170 and 5171
Hall B Forward Carriage 5371
Hall B Gas Shed 7115
Hall B Counting House 5244 (Shift Expert)
Hall B Counting House (757) 329-4846 (Shift Expert cell)
Hall B Counting House 5245 or 5126 (Shift Worker)
Hall A Counting House 5501
Hall C Counting House 6000
Hall D Counting House 5504
Hall B System Phone Number On-Call Person
Engineering (757) 748-5048 (cell) Engineering On-Call
Engineering (757) 897-9060 (cell) Denny Insley (secondary)
Slow Controls (757) 748-6922 (cell) Nathan Baltzell
Beamline (757) 303-3996 (cell) Eugene Pasyuk
DC (757) 748-5048 (cell) Engineering On-Call
SVT/MVT/MM (757) 541-7539 (cell) Yuri Gotra (primary)
SVT/MVT/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) 329-4844 (cell) Pierre Chatagnon
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
Target (757) 218-2266 (cell) Xiangdong Wei
Authorized Hall B Solenoid/Torus Operators
Hall B Denny Insley, Morgan Cook, Eugene Pasyuk
Magnet Group Probir Ghosha, Renuka Rajput-Ghoshal
Detector Support Group Brian Eng, Pablo Campero, Tyler Lemon
DC Power Onish Kumar, Sarin Philip
  • Note, all non-JLab numbers must be dialed with an area code. When calling from a counting-house landline, dial "9" first.
  • To call JLab phones from outside the lab, all 4-digit numbers must be preceded by 757-269
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CLAS12 Engineering Run, Fall 2017
Beam energy 10.6 GeV (5 pass)
Torus : +3770 A (100% field);
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: Daniel S. Carman

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

PDL: Eugene Pasyuk

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

Run Plan:

All studies for the next few shifts will use 100% torus field (negatives bending in); the strength of the solenoid field and the status of the hydrogen target are listed below.

  • Before beam is restored:
    • complete the work to put the solenoid in the FSD (and test that it works before delivering beam to the Faraday cup)
    • ensure that the solenoid is ready/safe to go to full field (but leave at 50% field for initial beam delivery)
    • ensure that the hydrogen target is ready to fill (but leave the target empty)
    • ramp the tagger magnet to the field for beam tuning to the tagger yoke dump
  • After the beam is restored in the early afternoon, tune the beam to the tagger yoke dump. Ensure that the BPM positions at 2C21 and 2C24 are correct and that the harp scans are acceptable;
  • After the beam in the upstream line is acceptable, call for MCC to turn off and degauss the tagger magnet (this will take 30 min);
  • Ensure that the solenoid is unmasked in the FSD system;
  • Tune the beam to the Faraday Cup and complete harp scans at 2C21, 2C24, and 2H01. These scans should match the standard plots (see logbook links under "Beam Tuning");
  • Position the beam at the center of the target with 1.5 nA beam and perform whatever beam steering at 2C21 and 2H01 is necessary to match the rates seen with last night's tune;
  • Once beam tuning is complete move the beam blocker in (beam should be off for this), ask for 5 nA and ask MCC to unmask the FSD;
  • Ask MCC to use BPM current readings from 2C24 and 2H01 for current lock (see;
  • Turn on the Forward Carriage detectors: ECAL, FTOF; check rates and record them in the logbook;
  • If rates are consistent with previous good beam tune, proceed to turning on LTCC, DC, HTCC, CTOF,CND, FT-Hodo;
  • If rates are acceptable, contact Y. Gotra to turn on SVT and M. Defurne to turn on MVT and FTT; while Yuri will monitor the SVT, increase the beam current to 5 nA: to be able to do that, FSD thresholds that were set for 1.5 nA will have to be scaled up according to the current (the new thresholds have to be communicated to MCC that will set them in the system).
  • Once all detectors are on, record rates in all detectors, and currents in the DC, SVT, and MM, at solenoid field settings of 50%, 60%, 70%, 80%, 90%, and 100%. To do that use the tool described at . Make sure that the logbook information is complete and readable!
  • At 100% solenoid field, record rates in all detectors, and currents in the DC, SVT, and MM, at beam currents of 5 nA, 15 nA, 25 nA, ... The beam intensity and duration will be established by the beamline expert and the SVT and MM experts. Make sure that the logbook information is complete and readable!
  • At 100% solenoid field take 30 min of data at the highest current authorized by the SVT/MM folks (ensuring that the DC and other detector currents/rates are acceptable). Select the trigger file based on high threshold ECAL clusters (to select electrons). Contact the DAQ expert to set this up.
  • Turn beam off and fill the target. Contact Engineering on-call to complete this work.
  • Restore beam to the Faraday cup at 0.5 nA. Record rates in all detectors, and currents in the DC, SVT, and MM, at beam currents of 0.5 nA, 5 nA, 10 nA, 15 nA, ... The beam intensity and duration will be established by the beamline expert, the SVT and MM experts, the DC experts, and the Forward Carriage experts.
  • Allocate several hours to work on detector optimization. This includes:
    • Reduce the DC time windows closer to their nominal production values
    • Reduce the FTOF and CTOF TDC time windows to match the FADC time window (400 ns). Ensure that the real timing peaks are properly centered in the time window.
    • Set the detector threshold to nominal values for initial data taking;
    • In all cases, contact the associated detector subsystem experts to complete this work in conjunction with the DAQ expert;
  • Record data for 2 hours with the high threshold ECAL cluster trigger and the random trigger. Contact the DAQ expert to set this up;
  • Whenever beam is off but Hall A or C have beam, checks rates and beam current monitor readings looking for possible bleedthrough.

General Instructions:

  • During beam tune and harp scans Hall-B halo FSD must be masked.
  • 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 without the beam blocker in front of Faraday cup. Put beam blocker in for long running at high currents.
  • 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.

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 \Chromox" 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: profile should be as in, and Make sure you select the proper PMT for the analysis. The profile at 2c21a and 2c24 should be as in the scans performed with beam to the tagger. 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 (including SVT)

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