Difference between revisions of "Run Group C"
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'''Reference Harp Scans for Beam on Faraday Cup 2H01''' [https://logbooks.jlab.org/entry/3963256] | '''Reference Harp Scans for Beam on Faraday Cup 2H01''' [https://logbooks.jlab.org/entry/3963256] | ||
| − | '''Reference Harp Scans for Beam on Tagger dump 2C21''' [https://logbooks.jlab.org/entry/ | + | '''Reference Harp Scans for Beam on Tagger dump 2C21''' [https://logbooks.jlab.org/entry/4007470], tagger harp [https://logbooks.jlab.org/entry/3963250] |
'''Reference Monitoring Histograms''' | '''Reference Monitoring Histograms''' | ||
Revision as of 11:09, 26 June 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 Group Coordinator: Sebastian Kuhn
- (9-)757 639-6640
RC: Carlos Ayerbe
- (9-)757 575-7540 or
PDL: Eugene Pasyuk
- (9-)757 876-1789 , x6020 office
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 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 https://logbooks.jlab.org/entry/4004055 - 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
ONGOING ISSUES
- x-Raster power supply oscillations
- Moller quadrupole Power Supply
- No 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
- Runs on empty target
- FIRST WITHOUT LHe:
- Try raising beam current up to 50 nA (DC occupancies Region 1 below 5-6%)
- Configuration PROD66, trigger file rgc_300MeV_v1.2_no_DC.trg
- Take data for about 22 M events. (This run will be used for Beam offset calibration)
- Controlled Access Saturday at 3:00; Rafo will come.
- Ramp down Solenoid and Torus; ask Rafo to bypass MVT HV interlock for no solenoid and set the correct HV settings for alignment run
- Rafo will work on SLM for Moller; once he is done go back to Beam Permit
- Once magnets are at zero, begin DC alignment run:
- Run with roughly 1 nA. Trigger file rgc_300MeV_v1.2_zero.trg (see https://logbooks.jlab.org/entry/4006380 and https://logbooks.jlab.org/entry/4003282 for instructions). Inform Valery Kubarovsky and Rafo before taking data! Check data early on and adjust accordingly. Take at least 5M triggers each with Trigger Bit 14 and with Trigger Bit 24; i.e., if trigger bit 14 is a fraction x of the total trigger rate, take 5M/x events.
- Ramp Solenoid and Torus back up. WHILE doing this, do another Moller run to test success or lack thereof. Make decision on Spin dance tomorrow (yes or no), confer with PD.
- 2nd Empty target production run without LHe
- Start raster and unmask raster FSD (orbit locks OFF)
- Raise beam current again, up to 50 nA or whatever is available (check DC occupancies and make sure they don't exceed 5%)
- Configuration PROD66, trigger file rgc_300MeV_v1.2_no_DC.trg
- Take 1 run (50 Mevents)
- 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
- In consultation with PD, Ops and Stepan, attempt spin dance:
- Set up for Moller running (4 nA beam on Tagger, Photon configuration with mask, etc.).
- Take one Moller run
- Ask MCC to start the spin dance (They change the Wien angle and we do Moller runs). The spin dance should not go longer than 3 hours.
- FIRST WITHOUT LHe:
- END EMPTY TARGET RUNNING. Ask target group to install new target (CH2 - check with RC/Sebastian/Target Group).
- CH2 run (fill with LHe)
- Raster on, FSD unmasked, no orbit lock.
- Take FC blocker out, go back to 4 nA and standard position on 2H01
- Take production data with standard trigger rgc_300MeV_v1.2_no_DC.trg, PROD 66.
- CH2 run (fill with LHe)
- Once we return to polarized target running (whenever that may be):
- Ask MCC to move HWP (a.k.a. 1/2 Wave Plate or lambda/2 plate) IN.
- Wait until target polarization is more negative than -50%.
- 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
- ECAL: ECAL_HV_SEC2_WI_E36 is off as it does not hold voltage
- 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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