Engineering Run

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Shift Schedule Shift Checklist Hot Checkout Beam Time Accounting

Manuals DC FTOF ECAL LTCC HTCC RICH CTOF CND SVT MVT MVT turn-on procedure FT Beamline Torus Power-Up and Power-Down Procedure Solenoid Power-Up and Power-Down Procedure Target DAQ Slow Controls

Procedures Beamline Commissioning Plan Establishing Physics-Quality Beam Performing Møller Runs Performing Harp Scans Commissioning Plan Simulation Background Estimates Trigger Commissioning Plan Tunnel/Hall Access DAQ Quick Reference/Recovery

JLab Logbooks MCC Hall-A Hall-B Hall-C Hall-D

Role Phone Number Hall B Run Coordinator (757) 575-7540 (cell) Hall B Physics Division Liaison (757) 876-1789 (cell) MCC 7048 Crew Chief 7045 Crew Chief (757) 876-3367 (cell) Program Deputy (757) 876-7997 (cell) RadCon (757) 876-1743 (cell) Gate House Guard 5822 Location Phone Number Hall B Floor 5165 Hall B Space Frame 5170 and 5171 Hall B Forward Carriage 5371 Hall B Gas Shed 7115 Hall B Counting House 5244 (Shift Expert) Hall B Counting House (757) 329-4846 (Shift Expert cell) Hall B Counting House 5245 or 5126 (Shift Worker) Hall A Counting House 5501 Hall C Counting House 6000 Hall D Counting House 5504

Hall B System Phone Number On-Call Person Engineering (757) 748-5048 (cell) (757) 897-9060 (cell) Engineering On-Call (primary) Denny Insley (secondary) Slow Controls (757) 748-6922 (cell) Nathan Baltzell Beamline (757) 303-3996 (cell) Eugene Pasyuk DC (757) 218-4372 (cell) (757) 748-5048 (cell) Florian Hauenstein (primary) Engineering On-Call (secondary) SVT/MVT/MM (757) 541-7539 (cell) (757) 753-7769 (cell) Yuri Gotra (primary) Rafo Paremuzyan (secondary) ECAL (757) 810-1489 (cell) Cole Smith FTOF/CTOF/CND (757) 344-7204 (cell) Daniel Carman ALERT (757) 329-4844 (cell) Raphael Dupré HTCC/LTCC (757) 344-7174 (cell) Youri Sharabian FT (757) 344-1848 (cell) Raffaella De Vita BAND (757) 310-7198 (cell) Florian Hauenstein RICH (757) 344-3235 (cell) (757) 748-6922 (cell) Christopher Dilks (primary) Nathan Baltzell (secondary) DAQ (757) 232-6221 (cell) Sergey Boiarinov HYDRA (317) 550-9226 (cell) Torri Jeske Authorized Hall B Solenoid/Torus Operators Hall B Denny Insley, Morgan Cook, Eugene Pasyuk Magnet Group Probir Ghosha, Renuka Rajput-Ghoshal Detector Support Group Brian Eng, Pablo Campero, Tyler Lemon DC Power Onish Kumar, Sarin Philip

• 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
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CLAS12 Engineering Run, Winter 2018
Beam energy 10.6 GeV (5 pass)
Important: Document all your work in the logbook!
Remember to fill in the run list at the beginning and end of each run (clas12run@gmail.com can fill the run list)

RC: Daniel S. Carman

• (757) 575-7540
• 9 575 7540 from Counting Room
• carman@jlab.org

PDL: Eugene Pasyuk

• (757) 876-1789
• 9 876-1789 from Counting Room
• pasyuk@jlab.org

• Note 1: Due to issues with the gas handling system with the MM trackers (BMT and FMT), the HV should be left off but the LV should be turned on.

• Note 2: Be very mindful of the background rates in the halo counters, rates in the detectors, and currents in the SVT for all settings to ensure that they are at safe levels.

• Note 3: At the end of each run, follow the DAQ restart sequence "end run", "abort", "reset", "download", "prestart", "go". The DAQ rate should be 2 -3 kHz (this includes a 1 kHz pulser). After DAQ prestart is complete reboot the scaler IOCs with the command: iocjscalerRestartAll.sh. Note: After each step, make sure it is complete in the Run Control message window. If a roc has crashed, find which one it is and issue a roc_reboot command and try again. Contact the DAQ expert if there are any questions.

Run Plan: When the hall is in beam permit, contact the Hall B Engineering Group to bring up the torus to 100% field (positive polarity, negatives inbending) and the solenoid to 100% field (nominal polarity). Tell MCC to bring the tagger magnet up to its nominal field for 5-pass beam when they are ready. The first task when beam is available is to tune the beam to the tagger magnet yoke dump. Follow the instructions under the "Procedures" link on the Run Info wikipage for setting up the beam (see the instructions for setting up the beam). See the reference harp scans for 2C21 and 2C24 (tagger harp) under the beam tuning section. The beamline expert should be present for this portion of the run plan. This work is as specified in the Commissioning Run Plan Phase 1 Step #1. Following beam tuning to the tagger magnet yoke, complete a series of Moller polarimeter run. The beamline expert should be present for this portion of the run plan. This work is as specified in the Commissioning Run Plan Phase 1 Step #2. When the beam tune in the upstream beamline is acceptable, ask MCC to turn off and then degauss the tagger magnet. Begin beam tuning to the Faraday Cup with 5 nA of beam. This work will include harp scans at 2C21, 2C24, and 2H01 (see the reference plots under the beam tuning section). Also complete target scans to find the nominal beam position. The beamline expert should be present for this portion of the run. Make sure to put screen captures of the main scaler GUI in the logbook. This work is as specified in the Commissioning Run Plan Phase 1 Step #3. When the beam tuning is completed, begin detector turn on with 10 nA of beam on the empty target cell. Turn on the Forward Carriage detectors first (ECAL, FTOF, LTCC, HTCC, RICH) - contacting the subsystem teams to perform this work. Record rates and current for all detectors in the logbook. This work is as specified in the Commissioning Run Plan Phase 1 Step #4. Fill the cryotarget following the instructions next to the target computer. Contact Hall B Engineering for any questions. This work is as specified in the Commissioning Run Plan Phase 1 Step #5. Continue detector turn on now for the DC, CTOF, CND, and SVT - contacting the subsystem teams to perform this work. Record rates and current for all detectors in the logbook. This work is as specified in the Commissioning Run Plan Phase 1 Step #6. Begin initial DAQ and trigger checkout to re-establish the DAQ and basic electron trigger from the Dec. 2017 run. This work will be led by the DAQ and trigger experts. This work is as specified in the Commissioning Run Plan Phase 1 Step #7. Work on detector setup optimization steps to set DC readout windows for R1, R2, and R3, and the PMT-based detector TDC readout windows to match the FADC windows. This work will be led by the DAQ expert in conjunction with the subsystem experts. This work is as specified in the Commissioning Run Plan Phase 1 Step #8. If necessary complete studies of the DC HV settings and DCRB thresholds. This work will be led by the DC expert. This work is as specified in the Commissioning Run Plan Phase 1 Step #9. Work on optimizing the electron trigger. This work will be led by the trigger team. This work is as specified in the Commissioning Run Plan Phase 1 Step #10. Begin solenoid rate studies and luminosity scans with both torus polarities at full torus field. These studies will be detailed here soon.

General Instructions: During beam tuning and harp scans Hall-B halo FSD must be masked. The main lights in the Hall (dome lights) and the Forward Carriage lights are being kept off because of light leaks affecting some of the detectors. If these lights are switched on during an access, they should be switched off when leaving the Hall. Note that the dome lights when switched off cannot be turned back on immediately because they require 10-15 min to cooldown. Do not run more than 60 minutes above 30 nA without the beam blocker in front of Faraday cup. Put beam blocker in for long running at high currents. Turn DC HV off only for beam tuning; if no beam is available or when beam is stable, keep them on even if you are not taking data. In case of loss of communication with IOCBTARG, follow instructions at https://logbooks.jlab.org/entry/3502218 With any issue contact On-Call Experts or RC - do not spend more than 15-20 min trying to fix the problem. All jscaler iocs (iocjscalerX) on the health screen under DAQ tab) must be restarted after every DAQ prestart is completed. A button to do it all in one is available on the beamline overview screen Check that no unecessary beamline-related screens are open. This includes particularly the big beamline overview screen, but also and any motor/harp/collimator screens, and ioc health screens. Beam Tuning: Whenever preparing to receive beam, make sure the following conditions are established: all CLAS12 detectors are off and target is empty. Turn DC HV off, leaving LV on. For SVT, MVT, FTH and FTT, first turn HV off and then LV off. For any problem, consult with the expert-on-call. Establish beam to the tagger yoke first: ask MCC to energize the tagger dipole magnet and set the current as needed for dumping the beam in the designated dump on the tagger yoke. MCC will ask you to change (set) the beam delivery mode. position the "blank" collimator on the beam (this is a collimator block, 30 cm long Ni cylinder, without a hole) when the tagger magnet is at required setting ask MCC if they are ready to deliver beam to the tagger yoke dump (<=5 nA). It may take ~1 hour for MCC to setup and cleanly transport beam to the tagger yoke dump. perform harp scans using the wire harp at 2C21 girder and 2C24 (tagger harp). Beam profile, peak position, width and signal/background ratio should be like in https://logbooks.jlab.org/entry/3507602 and https://logbooks.jlab.org/entry/3507605. Ask MCC to retune if needed (e.g. beam is too wide or asymmetric or has large tails),repeat the scan after every tune. Iterate to get acceptable beam profile. send the beam to Faraday Cup dump: CLAS12 detectors should be OFF, the solenoid magnet current is at 50% its max, torus is at 100%. ask MCC to degauss and turn the tagger dipole off; while the magnet is being degaussed call the beamline expert (S. Stepanyan) to inform him, you are starting the procedure to send the beam to the Faraday Cup; position 20 mm collimator on the beam and move "Chromax" screen of the downstream viewer in beam position (if it is not already) move the beam blocker out: in this configuration beam current readings at 2C24, 2H01 and Faraday Cup should be close. ask for <= 1 nA, positions, quads settings and rates should be as in https://logbooks.jlab.org/entry/3502404; pay particular attention to halo counter rates: if very different from what shown in the link, call MCC and ask them to verify their settings; note that BOM gains were lowered today and rates should be lower (see https://logbooks.jlab.org/entry/3502559). make sure beam is stable, beam spot is clearly visible on the Chromax viewer and current does not exceed 1 nA; repeat harp scans at 2C21, 2C24 (tagger harp) and 2H01: the profile for 2H01 should be as in https://logbooks.jlab.org/entry/3507626. Make sure you select the proper PMT for the analysis. The profile at 2C21 and 2C24 should be as in the scans performed with beam to the tagger magnet yoke dump. If necessary ask MCC to adjust the beam profile at 2H01 to match the previous scan. When ready to get beam, Turn all beamline devices ON, turn all CLAS12 detectors OFF (including SVT)

Every Shift: Follow run plan as outlined by RC If any concern about beam stability, ask MCC if orbit locks are on (they should be). Keep shift summary up to date in HBLOG. Record all that happens. Check on white board all scalers, strip charts and monitoring plots that need to be logged regularly Document any beam condition change and send scaler GUIs to HBLOG Fill out BTA hourly. Click "Load from EPICS" to automatically fill the left side. Fill and submit the shift checklist in the logbook Perform 2H01A harp scan once per shift or when beam conditions have changed, based on beam monitors (BPMs, halo rates, beam-viewer). During harp scans the HV for DC and HTCC should be OFF.

Every Run: Log screenshots of: main scaler GUI display Detector occupancy plots Trigger rate gui Beam strip charts

Webcams Faraday Cup Beam Viewer Tagger Beam Dump Viewer CND CAMAC Crate Hall Fisheye Saclay Cryotarget

Manuals CED Manual MON12 Manual off-line Manual

Epics on the web WebOPI (CUE Login)

Hall-B Operation Safety Procedures Offline Analysis Wiki RCDB

Accelerator Accelerator Whiteboard Program Deputy Shift Plans Run Coordinator Reports