Engineering Run

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Manuals DC FTOF ECAL LTCC HTCC RICH: expert novice 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: Leave the HV to the FMT off until further notice.

• 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.

• Note 4: Record forces on torus and solenoid sensors in configuration with torus at full field and solenoid at zero field.

• Note 5: When possible during a day time access, call Jennifer Williams to do a magnetic field survey in the hall with torus and solenoid at full field.

Run Plan: Complete RICH optimization studies at a beam current of 50 nA (set appropriate FSD thresholds). See instructions in logbook for the DAQ settings. Take data for EC calibration studies for 2 hours at 10 nA. Contact the ECAL expert for this work. Set appropriate FSD thresholds for the chosen current. Complete solenoid field scan: With a beam current of 10-20 nA, study the detector rates and currents for all subsystems, as well as DC occupancies for solenoid field settings of 100%, 90%, 80%, 70%, 60%, 50%. Record all information in the logbook. Set the proper FSD trip levels. Take higher luminosity data: Complete luminosity scan at currents of 100 nA, 125 nA, 150 nA using a random trigger (FSD settings of 400 upstream, 1000 midstream, 2e6 downstream, and 2e5 BOM). For each setting, record the rates and currents for all subsystems, as well as DC occupancies. Record all information in the logbook. DC time windows should be 250 ns (R1), 500 ns (R2), 750 ns (R3). Take data at 75 nA for 2 hr (set proper FSD trip levels) Take data at 125 nA for 2 hr (set proper FSD trip levels) Take calibration data with the torus at 60% field and the solenoid at 60% field for 8 hours at 10 nA beam current (set proper FSD thresholds). This work is as specified in the Commissioning Run Plan Phase 1 Step #14. Take data run for 8 hours at 50 nA (set proper FSD trip levels).

General Instructions: During beam tuning and harp scans Hall-B halo FSD must be masked. For a given beam current, compute the FSD thresholds according to the Establish Physics Quality Beam document. Call MCC to update the values. Contact the beamline expert if there are questions about setting the FSD thresholds. 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. 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