Run Plan for Sept. 22nd to Sept. 25th, 2023
- All shifts are canceled until Friday, Sept. 22nd, due to the target work and/or MCC beam/maintenance studies.
- Thursday, Sept. 21st: The tentative plan if everything progresses well with the target work is to lock up the hall in the day shift and start tunning the beam to the tagger dump in the swing/owl shift.
- Friday, Sept. 22nd:
- If the beam is successfully tuned overnight to the tagger dump, take a 1.5-hour Moller run with new quadrupole power supply and tagger ramping/degaussing; Does Eugene (or another beamline expert?) need to be consulted for this?
- Start tuning beam to Faraday cup. It may take 2.5 hours to ramp up the solenoid and torus to full current. The solenoid will be gradually ramped up to half field intensity, then full, then the torus will be turned on and ramped up to full inbending current. During this process, keep an eye on the deflection on the viewer; Does Eugene (or another expert?) need to be called for this?
- Trigger validation:
- Call MCC and ask for 35 nA and take 4 hours LD2 target run with a 30 kHz random trigger to validate electron trigger;
- Trigger file: rgd_250MeV_v1.0_30kHz.trg. Follow the DAQ instructions below to load a new trigger file.
- Take one hour LD2 run with e- trigger with no-DC-roads to validate the trigger roads.
- Trigger file: rgd_250MeV_v1.0_no_DC.trg. Follow the DAQ instructions below to load a new trigger file.
- Parasitic studies:
- When it's convenient, perform a slow beam current ramps up for scaler linearity. That can be done over the phone with the MCC ops using a 5 nA beam current increase steps until reaching 35 nA while starting the random trigger run. The process should take 5 to 7 min at max.
- The SVT/MVT expert could perform any SVT/MVT studies that fit within ongoing activities prior to production. (Comments and suggestions are welcome) -------- If everything goes well, that should bring us to the Swing shift -------
- DC HV Scan, TOF Gain and ECAL Calibrations:
- All runs will be taken with the e- trigger without DC-roads until the trigger roads are validated by the trigger team..
- Trigger file: rgd_250MeV_v1.0_no_DC.trg. Follow the DAQ instructions below to load a new trigger file.
- Ask MCC for 45 nA beam current and take approximately 5 hours runs with 4 DC HV settings. A total of 120 M electron triggers is needed for this study; two HV settings with 50 M each and the other two with 10 M each. Florian needs to be called to change the DC HV and confirm the statistics needed.
- Take a 1.5-hour run with just EPICS, no DAQ. Florian needs to be notified to be present in the CR during this run.
- Parasitically, 50 M electron triggers are needed for the TOF gain calibration
- Parasitically, the same data can be used to conduct a linearity study for the new ECAL PMTs.
- Coarse Luminosity Scan:
- This first study is needed for TOF/ECAL linearity and AI training. A series of runs will be taken with the following beam currents and the same electron trigger without DC roads:
- Trigger file: rgd_250MeV_v1.0_no_DC.trg.
- Ask MCC for 5 nA and take a 5 M triggers run. The random prescale factor needs to be decreased. Who should be notified about that, and for which beam current it should increase back? -------- If everything goes well, that should bring us to the Owl shift -------
- Saturday, Sept. 23rd:
- Luminosity Scan:
- Continue the study for the following beam currents and the same electron trigger without DC roads:
- Trigger file: rgd_250MeV_v1.0_no_DC.trg.
- Whenever the 5 nA run is done, ask MCC for 10 nA and take a 5 M triggers run.
- Ask MCC for 25 nA and take a 5 M triggers run.
- Ask MCC for 35 nA and take a 5 M triggers run. -------- If everything goes well, the Day shift should start somewhere in between these runs! -------
- Ask MCC for 50 nA and take a 5 M triggers run.
- Once done, we could perform a high-current luminosity scan (to-be-revised based on the feedback). If so, ask MCC for:
- 75 nA and take a 50 M triggers run.
- 100 nA and take a 50 M triggers run. Depending on the detector's performance (HV trips?), the beam current can be reduced to 90 nA or until the level that the trips cease. Would that work?
- Once done, Valery should be called to change the RICH to a high threshold setting, then take a 100 M electron trigger run with 35 nA (~ 4h run). Please, Valery, advise whether you want to take this run now with no-DC-roads, assuming all other subsystems will be at their nominal settings!)
- Once done, the RICH setting can be reverted. Valery may need to be contacted again. Continue LD2 data-taking with 35 nA and 100 M triggers runs until the end of the shift.---If everything goes well, that should bring us to the Swing shift ---
- Target Changeover:
- Denny/the target group (TBD) needs to be called ahead of time to ensure that the controlled access to change the target in the hall and boiling off LD2 will be done within 1/2h.
- Put the flag assembly in the C+C target configuration, then ask MCC for 30 nA and take a 1/2h run with the same electron trigger without DC roads:
- Trigger file: rgd_250MeV_v1.0_no_DC.trg.
- Solid-target Luminosity Scans:
- C+C target configuration:
- Ask MCC for 10 nA and take a 5 M triggers run.
- Ask MCC for 20 nA and take a 5 M triggers run.
- Ask MCC for 30 nA and take a 5 M triggers run.
- Ask MCC for 40 nA and take a 5 M triggers run.
- Ask MCC for 50 nA and take a 5 M triggers run.
- Cu+Sn target configuration:
- Ask MCC for 90 nA and take a 5 M triggers run.
- Ask MCC for 100 nA and take a 5 M triggers run.
- Ask MCC for 110 nA and take a 5 M triggers run.
- Ask MCC for 120 nA and take a 5 M triggers run.
- Ask MCC for 130 nA and take a 5 M triggers run.
- Ask MCC for 150 nA and take a 5 M triggers run.
- Once done, ask for 130 nA and take 100 M electron triggers runs of Cu+Sn until the end of the shift with the same electron trigger without DC roads:
- Trigger file: rgd_250MeV_v1.0_no_DC.trg.
- Sept. 24th:
- Continue Cu+Sn data-taking with 130 nA and 100 M triggers runs until the end of the Owl shift.
- Continue Cu+Sn data-taking with 130 nA and 100 M triggers runs until the end of the day shift.
- By the beginning of the swing shift, change the target configuration to C+C, then ask MCC for 30 nA and take at least 6h of 100 M runs.
- Plans may change but assuming the MCC MD will be on Monday, Sept. 25th (?), we should check with Denny/target group when they can come in to move the target back to LD2 position. The target won't be filled for the alignment run. Eugene may need to be contacted to ramp down the torus and solenoid magnets.
- Ask for 1 nA, and take 10 M electron triggers run with zero-field and the following electron trigger file based on CTOFxCND coincidence with no-DC-roads:
- Trigger file: rgd_250MeV_v1.0_zero.trg. Follow the DAQ instructions below to load a new trigger file.
- Monday, Sept. 25th:
- MCC maintenance/beam studies during the day shift (TBC)!
- After establishing the beam in the swing shift on the outbending configuration, take first a Moller run.
- Take another 50 M triggers run for the ECAL calibration upon Cole's request :
- Trigger file: rgd_250MeV_v1.0_no_DC.trg.
DAQ configuration
- Configuration is PROD66 or PROD66_PIN for runs requiring fast reconstruction.
- Trigger file: rgd_250MeV_v1.0_no_DC.trg without DC roads for first commissioning study while e- trigger is being validated.
- NOTE: UNLESS a RICH problem crashes the DAQ, do NOT interrupt an otherwise smooth run to make 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. Sometimes, it is the only way to know that a roc needs to be rebooted.
- 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 PROD6X and PROD6X_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
- "Cancel", "reset"
- "configure", "download", "prestart", "go"
- restart mon12
- 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.
Reference Values
FSD Thresholds from RG-C (to-be-changed for RG-D)
- Upstream: 5 Hz
- Midstream: 2 kHz
- Downstream: 10 kHz
- BOM: 1 MHz
- 5 ms dwell time
Harp Scan References from RG-C (to-be-changed for RG-D)
|
General Instructions:
- 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 cool down. Now we have a new dome light switch outside of the hall in the labyrinth. The lights can be turned off without entering the hall.
- Do not run more than 30 minutes above 90 nA with a 5-pass beam without the beam blocker in front of the Faraday cup . Put beam blocker in for long-running at high currents for 5-pass operations.
- Turn DC HV off only for beam tuning; if no beam is available or when the beam is stable, keep them on even if you are not taking data.
- With any issue, contact On-Call Experts or RC - do not spend more than 15-20 min trying to fix the problem. If the phone is not answered, try the "Page Experts" button on top of CLASCSS.
- Check for and read any comments to log-book entries made during your shift!
Every Shift:
- Follow the run plan as outlined by RC
- If there is 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.
- Document any beam condition change and send scaler GUIs to HBLOG
- If HWP is changed, start a new run
- Upload spectra from clas12mon at the beginning and end of the shift and cross-check with reference spectra (make sure you select the SAME SECTOR for the reference plots on tabs with multiple sectors).
- Reset clas12mon every ~2 hours and inspect spectra (some detectors have buttons at the bottom to toggle between the sectors -- please check all of them).
- Fill and submit the shift checklist in the logbook
Every Run:
- Check values at the start of every run and log screenshots of:
- Main scaler GUI display
- Trigger rate GUI
- Beam strip charts
- FTC scalers
- At the start and end of every run, check that the data filled in the database run list is correct (especially fields that are filled in manually, like beam current and comments). This replaces the previously used spreadsheet.
To access the Hall:
- If you need to go down into Hall B, alert Denny Insley (757-897-9060, cell/text: 757-810-9576) and the Run Coordinator (757-575-7540).
- Check in with the shift personnel before entering the hall.
|