Run Group C
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- Shift Documentation
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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.
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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
- Dial "9" before all numbers when calling from CH
Run Group Coordinator: Sebastian Kuhn
- (9-)757 639-6640
RC: Sebastian Kuhn
- (9-)757 575-7540 or
- (9-)757 639-6640
PDL: Eugene Pasyuk
- (9-)757 876-1789 , x6020 office
Run Coordinator and Target Expert Schedule
Longterm Run Plan
IMPORTANT NOTES:
- 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 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.
- For beam tuning or other non-rastered beam, the Raster FSD must be MASKED.
Run Plan: June 2022
- All shifts are cancelled until Saturday 7:00 a.m.
- Fri, 6/10: Target maintenance. Install cross-hair target probe for beam. (No LHe in target)
- Sat, 6/11: Establish beam following "Physics-Quality Beam" Procedure under "Shift Documentation" tab.
- Begin commissioning and raster calibration:
- Center beam on target, using rates in downstream beam monitors. Establish wire positions (2H01 x and y). Center beam on target and turn on orbit lock on 2C24.
- Follow Raster Manual under "Shift Documentation" tab to calibrate raster settings.
- Turn on rastering and check all alarms and interlocks.
- Swap to empty target. Take one run (no LHe) to determine nominal beam center position relative to DC. Move beam to find the target cell edges. Finalize raster setup and set CCDB parameters.
- Swap to 12C target. Do a current scan to determine optimum combination of raster size and luminosity.
- Complete other calibration runs as requested: DC HV, BMT HV, TOF.
- Begin commissioning and raster calibration:
- Weekend: Take data with MT, 12C and polarized NH3 targets.
- Early next week: If time allows, take data on CH2, CD2 and polarized ND3.
- Then change from 1-pass to 5 pass.
1-pass (2.1 GeV) Running conditions
- Torus at 50% current, inbending electrons. Setpoint +1885 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 50 nA).
DAQ configuration
- Configuration TBA, trigger file rgc_100MeV_V1.0_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 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
Nominal Beam Positions
- 2H01, X: ? mm, Y: ? mm (only used/useful without restoring)
- 2C24, X: -? mm, Y: ? mm (orbit lock)
FSD Thresholds (to be updated)
- Upstream: 2000 Hz
- Midstream: 2000 Hz
- Downstream: 500000 Hz
- BOM: 10000
- 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.
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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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