Run Group C
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Shift ScheduleHall B LogbookESAD, COO, RSAD
Shift 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: Susan Schadmand
- (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
Medium-Term Run plan (FTout portion)
IMPORTANT SHIFT 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. * 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!
Short Term Schedule Th, Oct 20, 2022
- Run duration: 100M events or 4 hours, whichever comes first.
- Current: 8 nA
- Note, BOM is not installed for this experiment
- If HWP is changed by Hall A (they will notify us) stop run and start new run after HWP change is finished
PLAN:
- recover from solenoid trip
- when the magnet is back up, the target polarization should just come back
- Continue production on ND3
- Th, ca 8pm HWP IN (coordinate with Hall A and inform other Halls)
- Fr, after RC meeting, start anneal and polarization change (to negative)
<-> ask for rapid access, RadCon needed(work on beamline)
- Moller run (with 1/2 plate OUT) maybe Friday
done:
- https://logbooks.jlab.org/entry/4063875 has the new mon12 reference plots.
- Here, the CND broken CFD has been fixed BUT not all thresholds were set correctly.
- However, the plots show the intermittent problem ADCECAL2 Missing Strips, see https://logbooks.jlab.org/entry/4063973 and https://logbooks.jlab.org/entry/4063994.
Run Plan: September - December 2022
GENERAL INFORMATION
- Before leaving the hall and going to beam permit check that dome lights, forward carriage lights, and pie tower lights are OFF
- Moller runs should be taken with 8-10 nA.
- 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.
- We have a new FSD condition for when 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.
- Whenever you change the raster offset, ask MCC to NOT correct whatever happens on 2H01. Note new 2H01 values and inform MCC of the new 2H01 x and y values - then they can keep the beam at those positions.
- 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. Note that UED is hardware failure, DAQ adjustments are PCC.
- 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.
- Whenever the target type or polarization direction changes, or the half-wave plate status changes, make sure to enter a comment in the BEGIN RUN / END RUN comment box.
- Whenever there is magnet trip due to cryo, also inform the target expert about the cryogenic issues
- Do not change running conditions while a run is ongoing. This includes changing target polarization or HWP, etc.
- The Faraday Cup power limit for the continuous operation was lifted up to 1 kW. For the remainder of the RGC the beam blocker should not be used https://logbooks.jlab.org/entry/4047791
5-pass (10.55 GeV) Running conditions
- Torus at 100% current, inbending electrons. Setpoint = +3770 A (Readback = +3766 A)
- Solenoid setpoint inverted (Oct 14 2022) -2417.5 A
- Solenoid setpoint +2417.5 A (normal conditions RGA-M)
DAQ configuration
- Configuration PROD66/PROD66_PIN, trigger file rgc_300MeV_v2.3_Q2_1.5GeV2.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 and you will run with the same configuration and trigger file, then: "prestart", "go"
- If you are changing configuration (between PROD66 and PROD66_PIN) or trigger file: "cancel", "reset", "configure", "download", "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 19 Sept. 22 (updated October 14, 2022)
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 = 3.5 V, offset = -0.65 V
- y: Vpp = 3.0 V, offset = 0 V
- Fundamental Period = 2 s
- The correct raster calibration constants should be automatically loaded by rastermon - if not, enter them through "Config" by hand:
- f(x) = 0.0104*x + -25.5
- f(y) = -0.0115*y + 24.4
Nominal Beam Positions
- 2C21A, X = -0.4 mm, Y = +0.6 mm
- 2C24A, X = -2.0 mm, Y = +0.6 mm
- 2H01, X = -1.9 mm, Y = +1.5 mm
- Orbit lock on 2C24 and 2H01 ONLY if raster is OFF, otherwise orbit lock on 2C21 and 2C24 (note: this appears as "stopped" on the beam line GUI).
FSD Thresholds
- Upstream: 2000 Hz
- Midstream: 2000 Hz
- Downstream: 100000 Hz (1e5)
- BOM: 1000000 Hz (BOM not installed for RG-C)
- 5 ms dwell time
Reference plots and histograms
- Harp Scans for Beam on Faraday Cup, 2H01 [1], more recent scan (3 Sept 2022): [2]
- Harp Scans for Beam on 2C21 [3], more recent scan (3 Sept 2022): [4]
- Harp Scan on Tagger Dump (3 Sep 2022) [5]
- Monitoring Histograms (20 Oct 2022) [6]
- RasterMon (20 Oct 2022) [7]
Counter rates
- With 6 nA beam, the upstream counters should read zero.
- The Midstream ones should read 0-20 Hz or so.
- Greatly increased rates 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):
- 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)
ATTENTION: If you plan to take (a) remote shift(s), you MUST test your setup (including VNC connection) at least 24 hours before your first shift!
Shift Worker Tasks
New: Use the new HBRUN logbook for automated and run-specific entries and screenshots, see https://logbooks.jlab.org/entry/4048698
Make the following log entries 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 CS-Studio
- Helicity Trigger Asymmetry strip-chart (CS-Studio -> DAQ -> Helicity-Latched Trigger GUI Screen -> Menu -> livePlot). See more info below
- Upload monitoring plots to logbook
- Standard spectra (mon12): inspect all all monitoring histograms and carefully compare them to the corresponding reference histograms: reference, current, and 5 most recent runs.
- You can choose a different reference run if you are confident what you are doing, the reference numbers refer to logbook entries.
- Raster Monitoring (use "Log Entry" button on RasterMon screen at bottom-right corner).
- An example of a "decent looking" RasterMon is here: [8]. The x and y distributions should show a smooth dome, without any horns or spikes on it and without the distributions being cut off at the edges.
- Standard spectra (mon12): inspect all all monitoring histograms and carefully compare them to the corresponding reference histograms: reference, current, and 5 most recent runs.
Once per shift:
- Fill the shift checklist
- Log screen shots of RICH temperature and scaler maps. Log in RICH logbook.
Regularly:
- 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.
- Check the life cam of the polarized target run valve for plumes or ice buildup (hallbcam04)
- Make sure you refresh the web page! Its no longer necessary to put a snapshot into the logbook UNLESS something looks suspicious. In THAT case, immediately inform the target expert(s).
- Log the strip charts in time intervals according to the x-axis time span, via right-click on the screen and selecting "Make Elog Entry". Make sure NOT to submit to ELOG.
- Beam current and position strip-charts (CS-Studio -> Beamline -> Strip Charts)
- Helicity Trigger Asymmetry strip-chart (CS-Studio -> Helicity-Latched Trigger GUI Screen -> Menu -> livePlot)
- Example https://logbooks.jlab.org/entry/4041939) (not accessible remotely).
- Select the 2nd variable from bottom (dark green) on all 3 strip charts to get a reasonable scale. Set the vertical scale on the bottom strip chart manually to have the same range for both variables, roughly from 0.5 to 0.9.
- You can also see beam charts in the Web Browser: Upstream/Midstream Halo Counters, Downstream Halo Counters, Beam Currents, BPM Positions
Webcams
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Manuals |
Epics on the web |
Live Monitoring Links |
Hall-B
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Accelerator |
ZOOM meetings
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