Run Group C
- Shift Documentation
- Phone Numbers
- Short Term Schedule
- Shift Expert
- Worker Shift
- Useful Links
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
In case of a problem with superconducting magnets call Engineering on-call first, particularly if it is related to cryo.
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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: Yelena Prok
- (9-)757 575-7540
PDL: Eugene Pasyuk
- (9-)757 876-1789 , x6020 office
Run Group Coordinator: Sebastian Kuhn
- (9-)757 639-6640
- 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 and JLab medical services immediately so that replacements can be arranged
- Recently there were several reported cases of COVID on the JLab campus. Everyone is strongly encouraged to wear a face mask while in the counting-house.
- 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 follow these steps, and the same for mon12. Make sure there is ONLY ONE INSTANCE of RasterMon AND mon12 running anywhere in the Counting House.
- 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: August 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.
- Do a RICH Recovery procedure only once a day during day shift (in between runs) if everything is okay. If a RICH problem occurs, you might have to do the RICH Recovery procedure also (see below).
- After each change of running conditions (target type, luminosity): Please check that the trigger alarms (on rate/nA) are set appropriately and change them as needed.
- x-Raster power supply oscillations
SHORT RANGE PLAN
Wednesday 10th August
- Owl: Take production data on ND3 negative at 4 nA HWP OUT
- Day: Take production data on ND3 negative at 4 nA HWP OUT
- Change HWP to IN during day shift (inform Halls C and D about an hour beforehand)
- Swing: Take production data on ND3 negative at 4 nA HWP IN
Thursday 11th August
- Owl: Take production data on ND3 negative at 4 nA HWP IN
- 6:30 AM Beam will be off for Machine Development Day
- Hall B will go to Restricted Access
- Day: Machine Development Day
- Change of target material to NH3
- Swing: Tune beam and adjust the raster parameters to accommodate for the smaller cell.
- Take production data on NH3 at 4 nA HWP IN
Friday 12th August
- Owl: Take production data on NH3(+) at 4 nA HWP IN
- Day: Plan to replace target material with another NH3 sample
- Optimize raster parameters for the 15 mm cell until 8:30.
- Ask for Controlled Access at 8:30am. Call RadCon to inform them of the target work.
- Swing:Take production data on NH3 at 4 nA HWP IN
5-pass (10.55 GeV) Running conditions
- Torus at 100% current, inbending electrons. Setpoint = +3770 A (Readback = +3766 A)
- Solenoid setpoint +2417.5 A
- Establish optimal compromise between raster size (if possible, 7 mm radius), luminosity (goal: <5 nA, nominally 4.0 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).
- Configuration PROD66, trigger file rgc_300MeV_v1.3_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:
- Quit ALL running instances of mon12 and rastermon
- "cancel", "reset"
- "configure", "download", "prestart", "go"
- restart mon12 and rastermon
- 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 =-0.3V (changed Vpp x & y from 2.1 to 2.2 V on July 19 for ND3)
- y: Vpp=2.2 V offset =+0.25V (changed from +0.4V on July 14, changed from -0.1 on July 1 at 21:00)
- Fundamental Period = 1 s
- The correct raster calibration constants should be automatically loaded by rastermon - see https://logbooks.jlab.org/entry/4004055 - if not, enter them through "Config" by hand.
Nominal Beam Positions
- 2H01, X = -2.3 mm, Y = +1.2mm (Changed from 1.8 mm 7/14/22)
- 2C24, X = -2.0 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 
Reference Monitoring Histograms
- 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.
- ECAL: ECAL_HV_SEC2_WI_E36 is off as it does not hold voltage
- tdcecal6 and tdcecal1 rocs: These rocs could show errors in the DAQ screen. If so, check roc-rates, trigger rates and monitoring plots. If all looks okay, continue data taking.
- 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.
(remote) shift worker: see dedicated Worker Shift tab above.
For REMOTE Shifts (offsite):
- Zoom for 24-7 communication with counting house: https://jlab-org.zoomgov.com/j/1619881100
- Passcode REQUIRED: 927417
- Remind the expert in the counting house to restart their zoom, if necessary
- Remote VNC connection instructions: https://logbooks.jlab.org/entry/3906039
- All necessary applications should be avaible from the desktop menu (left/right click on the desktop)
- EPICS GUIs should be accessed ONLY via the desktop menu or by running clascss-remote.
- Remote Demonstration Video (150 MB)
Shift Worker Tasks
Once per run:
- Screenshots: submit to logbook only if you capture the information with beam ON
- Beamline Overview, in VNC or Web Browser
- CLAS12 Trigger rates and DAQ status
- RGC Polarized Target GUI - under Beamline on CSS
- Upload monitoring plots to logbook
- Standard spectra (mon12): look at the spectra: Reference, current, and 5 most recent runs. You can choose a different reference run, the reference numbers refer to logbook entries.
- Raster Monitoring: upload RasterMon plots to the logbook (use "Log Entry" button on RasterMon screen at bottom-right corner)
- Make a log entry with the photograph of the polarized target run valve (hallbcam04)
Once per shift:
- Fill the shift checklist
- Log screen shots of RICH temperature and scaler maps. Log in RICH logbook.
- reset & check spectra frequently (every 30 - 60 minutes)
- Some plots in the online mon12 have a choice of histogram sets per sector, select buttons at the bottom of the plot. That means you have to look at all sectors for these histograms.
- The logbook entry shows all histograms.
- Log the strip charts in time intervals according to the x-axis time span, using the liveplot configuration Beamline4Logbook_visibleH
- how to get the strip charts: CS-Studio Tools: Strip Charts, livePlot
- right-click on the livePlot screen and select "Load a Configuration"
- the configuration "Beamline4Logbook_" provides the beam current, position information and halo counter rates
- right-click on the screen and select "Make Elog Entry", make sure to log to HBLOG and not ELOG
- in Web Browser: Upstream/Midstream Halo Counters, Downstream Halo Counters, Beam Currents, BPM Positions
- how to get the strip charts: CS-Studio Tools: Strip Charts, livePlot
Epics on the web
Live Monitoring Links