Difference between revisions of "Run Group C"
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* 8:15 am Thursday: Beam off for RF recovery. Ask MCC for Controlled access to insert NH3 target. | * 8:15 am Thursday: Beam off for RF recovery. Ask MCC for Controlled access to insert NH3 target. | ||
* Hall in controlled access. Target change to NH3. Fixing of some issues related to the detector system and DAQ. | * Hall in controlled access. Target change to NH3. Fixing of some issues related to the detector system and DAQ. | ||
| + | * Once all work in the Hall is completed, TURN DOME LIGHTS OFF and ask for beam permit. Once beam is imminent, set up for beam on tagger dump. | ||
| + | ** Note: Raster must be on at all times, raster FSD unmasked, FC blocker removed, viewer out | ||
| + | * After checking beam position and profile, set up for Moller run - take data for both target polarizations. | ||
| + | * Put beam on FC, steer to nominal position and start data taking (assuming target polarization is > 50%) | ||
| + | * Over the weekend, take production data on NH3 (see above for sequence of HWP and target polarization reversals) | ||
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Revision as of 12:54, 14 July 2022
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- Shift Documentation
- Phone Numbers
- Short Term Schedule
- Shift Expert
- Worker Shift
- Monitoring
- Useful Links
Shift ScheduleHall B LogbookESAD, COO, RSADShift ChecklistHot CheckoutBeam Time Accounting
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Manuals
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Procedures |
JLab Logbooks
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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
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- 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
- Click Here to edit Phone Numbers. Note, you then also have to edit the current page to force a refresh.
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: Jiwan Poudel
- (9-)757 575-7540
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
IMPORTANT NOTES:
- 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: July 2022
GENERAL INFORMATION
- 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).
ONGOING ISSUES
- x-Raster power supply oscillations
- Small deuteron polarization / NMR signal
Short Range Plan
Thursday July 14 day shift.
- 8:15 am Thursday: Beam off for RF recovery. Ask MCC for Controlled access to insert NH3 target.
- Hall in controlled access. Target change to NH3. Fixing of some issues related to the detector system and DAQ.
- Once all work in the Hall is completed, TURN DOME LIGHTS OFF and ask for beam permit. Once beam is imminent, set up for beam on tagger dump.
- Note: Raster must be on at all times, raster FSD unmasked, FC blocker removed, viewer out
- After checking beam position and profile, set up for Moller run - take data for both target polarizations.
- Put beam on FC, steer to nominal position and start data taking (assuming target polarization is > 50%)
- Over the weekend, take production data on NH3 (see above for sequence of HWP and target polarization reversals)
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).
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:
- 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=2.1 V offset =-0.3V
- y: Vpp=2.1 V offset =+0.4V (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 = +1.8mm (NEW values!)
- 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 [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
- 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
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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):
Shift Worker TasksEvery Run:
Every Shift:
Regularly:
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Webcams
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Manuals |
Epics on the web
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Live Monitoring Links |
Hall-B
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Accelerator |
ZOOM meetings
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