Run Group C

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NOTE: All NON-JLab numbers MUST be dialed with (757) area code. When calling from a CH landline, dial "9" first. To call from outside, all 4-digit numbers must be preceded by 757-269

Person Phone Number
Run Coordinator 9-757 575-7540 (cell)
Physics Division Liaison 9-757 876-1789 (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) Silvia Niccolai
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
Polarized Target (757) 218-2266 (cell) Chris Keith
Target (757) 822-9586 (cell) Bob Miller Primary
Target secondary (757) 897-9060 (cell) Denny Insley

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 the current page to force a refresh.

CLAS12 Run Group C, Summer 2022

Daily RC Meetings at 14:00: CH Room 200C, and on Zoom

Zoom information: Link, Meeting ID: 160 867 4253, Passcode: 786506

Run Coordinator: Stephen Bueltmann

  • (9-)757 575-7540

or (9-)757 232-5368 (private cell)

PDL: Eugene Pasyuk

  • (9-)757 876-1789 , x6020 office

Run Group Coordinator: Sebastian Kuhn

  • (9-)757 639-6640

Run Coordinator and Target Expert Schedule

Longterm Run Plan


  • In case of medical or fire emergency, call 9-911 from a LANDLINE phone in the Counting House
  • If you have symptoms or a positive COVID test, do NOT come to your shift - instead, inform the PDL and the RC immediately so that replacements can be arranged
  • If needed, worker shifts can also be taken from off-site - again, inform the PDL and RC. Also, make sure that you follow the instructions under the "Worker Shift" Tab - you need some lead time to set up!
  • Before leaving the hall and going to beam permit check that dome lights, forward carriage lights, and pie tower lights are OFF
  • NEW: We have a new policy NOT to leave the beam viewer in the beam at all times, to avoid damage to electronics, cameras etc. Please REMOVE the beam viewer unless we are actively tuning the beam or calibrating beam position/raster.
  • NEW: We have a new FSD condition that the raster is operating.
    • IF there is any ammonia sample (NH3 and ND3) in the target, the raster MUST be operating at all times. The Raster FSD must be UNMASKED. Orbit locks MUST be OFF (except for brief moments to restore beam position).
    • For beam tuning or other non-rastered beam, the Raster FSD must be MASKED.
  • NOTE: It should no longer be necessary to quit RasterMon at the end of each run and restart after a successful "Go" for the next run, but if DAQ crashes, you should do that. The correct raster calibration constants should be automatically restored to their correct values - see - if not, enter them through "Config" by hand. Make sure there is ONLY ONE INSTANCE of RasterMon running anywhere.
  • REMINDER FOR ALL EXPERTS: Please take care to fill out the BTA carefully and correctly. The info from EPICS is not always correct, e.g. when taking data with low beam current, you should change the ABU to the proper (estimated) time by hand instead of simply accepting "0" if you are actually taking data.

Run Plan: June 2022


  • We should change the HWP ("lambda/2 plate"), after a full day of useful data on NH3 or ND3. WE MUST INFORM THE OTHER HALLS WHENEVER WE DO THAT
  • We should reverse the target polarization after every TWO days of good data taking. So the sequence is "1 day on ammonia, swap HWP, one day on ammonia, flip target polarization, one day on ammonia, swap HWP, one day on ammonia".
  • Moller runs should be taken with 10 nA.


  • x-Raster power supply oscillations
  • Moller quadrupole Power Supply
  • Non working deuteron NMR

Short Range Plan

  • General Note: Inform MCC of the new 2H01 x and y values: 2H01 x = -0.7 mm, y = +0.1 mm
  • Complete runs on empty target (at some point)
    • Empty target production run WITH LHe
      • Start raster and unmask raster FSD (orbit locks OFF)
      • Fill target with LHe (ask target expert). Reduce beam current as needed to keep DC occupancies around 5%.
      • Configuration PROD66, trigger file rgc_300MeV_v1.2_no_DC.trg
      • Take 1 run (4 hours / 100 M events) with raster and standard configuration
  • Once we return to polarized target running (deuteron):
    • Ask MCC to move HWP (a.k.a. 1/2 Wave Plate or lambda/2 plate) IN.
    • Wait until target polarization is larger than 20%.
    • Take production data with standard trigger rgc_300MeV_v1.2_no_DC.trg, PROD 66.

5-pass (10.55 GeV) Running conditions

  • Torus at 100% current, inbending electrons. Setpoint +3766 A
  • Solenoid setpoint +2417.5 A
  • Establish optimal compromise between raster size (if possible, 7 mm radius), luminosity (goal: <5 nA), and background.
  • Run duration 100M events or 4 hours, whichever comes first.
    • For empty target runs, increase beam current as much as possible (up to 15 nA).

DAQ configuration

  • Configuration PROD66, trigger file rgc_300MeV_v1.2_no_DC.trg
  • NOTE: UNLESS a RICH problem crashes the DAQ, do NOT interrupt an otherwise smooth run to do a RICH recovery - instead do this in between runs.
  • NOTE: BOTH the shift expert AND the shift worker MUST check and reset monitoring histograms at least once every 30-60 minutes to make sure there are no major detector problems.Watch the raster pattern!
  • At the end of each run, follow the STANDARD DAQ RESTART SEQUENCE:
    • "end run", if the run ended correctly then: "prestart", "go"
    • if the run did not end correctly or if any ROCs had to be rebooted:
      • "cancel", "reset"
      • "configure", "download", "prestart", "go"
  • After each step, make sure it is completed in the Run Control message window. If a ROC has crashed, find which one it is, issue a roc_reboot command ON JUST THAT ROC and try again. Contact the DAQ expert if there are any questions.

References and Standards

Solenoid set-point of 2417.5 A results in read back 2419.57 A and exactly 5.00 T field on center Raster settings

  • x: Vpp=2.2 V offset =+0.1V
  • y: Vpp=2.2 V offset =-0.1V
  • Fundamental Period = 1 s

Nominal Beam Positions

  • 2H01,x = -0.7 mm, y = +0.1 mm (NEW values!)
  • 2C24, X: -2 mm, Y: 0.6 mm
  • Orbit lock ONLY if raster is OFF

FSD Thresholds (to be updated)

  • Upstream: 2000 Hz
  • Midstream: 2000 Hz
  • Downstream: 100000 Hz
  • BOM: 1000000 Hz
  • 5 ms dwell time

Reference Harp Scans for Beam on Faraday Cup 2H01 [1]

Reference Harp Scans for Beam on Tagger dump 2C21 [2], tagger harp [3]

Reference Monitoring Histograms

Counter rates

  • Upstream counters integrated rates: 0-15 Hz (acceptable up to 100 Hz are acceptable) @50 nA.
  • Midstream counters: 10-20 Hz (acceptable up to 50 Hz) @50 nA.
  • Counting rates of ~ hundreds of Hz may indicate bad beam tune or bleed-through from other Halls.

Known issues

  1. ECAL: ECAL_HV_SEC2_WI_E36 is off as it does not hold voltage
  2. DC: hole in sector 3, superlayer 6, would likely need a major physical repair on the chamber itself

NOTE: BOTH the shift expert AND the shift worker MUST check monitoring histograms at least once every 30 - 60 minutes to make sure there are no major detector problems.

  • Follow the [Short Term Schedule] as outlined by RC
    • includes Run Plan, DAQ configuration, and References and Standards
  • Keep shift summary up to date in HBLOG. Record all that happens.
  • Polarized target issues: In all cases contact the polarized target expert on call. Examples to keep an eye on:
    • Ice on the run valve
    • NMR running
      • The JLab Polarization Display is seen via a VNC window in the counting room. Here, the NMR Controls' blue bar should be moving, indicating that the NMR is running and the polarization is measured. If the NMR is not running, contact the expert on call.
    • Alarms from System RG-C Polarized Target (alarm handler). If you get an alarm, ...
  • Do a RICH recovery (press the RICH Recovery button on the GUI) once daily during day shift, between runs. Please log in shift summary.
    • Note the automated "RICH Recovery" sequence already confirms RICH4 is up and accepting ssh connections before claiming success. And it also prints out that you have to "Cancel->Reset->Configure->Download->Prestart" before starting the next run.
  • Fill out BTA hourly. Click "Load from EPICS" to automatically fill the left side then correct as needed.
    • Accelerator beam time:
      • ABU: acceptable beam used (eg harp scans, calibrations, trigger settings, running)
        • The info from EPICS is not always correct, e.g. when taking data with low beam current, you should change the ABU to the proper (estimated) time by hand instead of simply accepting "0" if you are actually taking data.
      • BANU: beam acceptable but not used (eg radiator change or our problems)
      • BNA: beam not acceptable (eg tuning, drifting, not focused)
    • Experiment beam time
      • ER: experiment ready
      • PCC: planned configuration change (when beam is masked while radiators are moved, DAQ (roc rebooting, restarting runs)), if more than 5 minutes, put a short comment, eg harp scans or DAQ.
      • UED: unplanned experiment down (hardware failure)

In case of other questions or uncertainties of what to do, call the RC or PDL

(remote) shift worker: see dedicated Worker Shift tab above.

For REMOTE Shifts (offsite):

Shift Worker Tasks

Every Run:

  • With beam present, log screen shots of:
    • Beamline Overview, in VNC or Web Browser
    • RGC Polarized Target GUI - under Beamline on CSS
    • Upload RasterMon plots to the logbook (use "Log Entry" button on RasterMon screen)
    • CLAS12 Trigger rates and DAQ status
  • upload monitoring plots (mon12) to logook
    • look at the spectra: Reference, current, and 5 most recent runs, choose a reference run (the reference numbers refer to logbook entries):
    • In particular, take note of the new Raster Monitoring interface - see "Monitoring" Tab.

Every Shift:

  • Fill the shift checklist
  • Log screen shots of RICH temperature and scaler maps. Log in HBLOG and RICH logbook.


  • reset & check spectra frequently (every 30 - 60 minutes)
    • Some plots in mon12 have a choice of histogram sets per sector, select buttons at the bottom of the plot. Only the currently selected set ends up in the logbook entry.
    • that means you have to look at all sectors for these histograms
Backup shifter contact info
Name Email Cell phone
Bob Cat
John Doe



Epics on the web

Live Monitoring Links