Nuclear Target Test
CLAS12 Nuclear Target Test, January 31 - February 7, 2020
Beam energy ~10.4 GeV (5 pass)
Important: Document all your work in the logbook!
RC: Eugene Pasyuk
- (757) 575-7540
- 9 575 7540 from Counting Room
PDL: Maurizio Ungaro
- (757) 876-1789
- 9 876-1789 from Counting Room
- Torus at full field, electrons inbending
- Solenoid at full field.
- BMT is removed
- FTT is OFF
- SVT is removed and replaced with two sensors
- BAND is removed
- FT is not in DAQ configuration. We will use scalers only
Run Plan: Feb 1, 2020
DAQ config: PROD66_NUCL_TEST
Trigger file : rtrigger: rgf_inbending_v1_1.trg
Keep an eye on CND channel S14L1R -- it's a bit temperamental. If it trips, switch HV off and on again for it and make an entry in the log book.
At the end of each run, follow the STANDARD DAQ RESTART SEQUENCE
References and Standards:
(last update 1/29/2020- 23:20)
Nominal Beam Positions
Reference Monitoring Histograms (40 nA, production trigger) 
Beamline vacuum: should be not higher than 5e-5.
Notes / Troubleshooting :
If crate ADCBAND was rebooted: Contact BAND expert and make a note in the HBBAND logbook and in HBLOG.
FTOF HVs: The goal is to minimize the number of power cycles of the dividers.
- OFF during: initial beam tuning to the Faraday Cup after CLAS12 has been off for a long shutdown, during a Moller run, harp scans, or if there is tuned/pulsed beam in the upstream beamline.
- ON after an initial beam tune has been established and if there are only minor steering adjustments and “tweaks” being made.
- If in doubt, call FTOF expert
FTT (mmft1) recovery:
- power cycle FTT LV (FT->FTT->turn LV OFF, turn LV ON)
- RunControl "reset"
- roc_reboot mmft1
Torus and/or Solenoid Fast Dump
- Notify MCC to request beam OFF and to drop Hall B status to Power Permit
- Call Engineering on-call
- Make separate log entry with copies to HBTORUS and HBSOLENOID logbooks. In the "Notify" field add Ruben Fair, Probir Goshal, Dave Kashy and email@example.com
- Notify Run Coordinator
- Turn off all detectors
Beam to the Faraday Cup: Fast Shut Down elements
- Upstream, Midstream, Downstream, BOM, and Solenoid FSD elements should always be in the state UNMASKED
- No changes to the FSD threshold should be made without RC or beamline expert approval
Turning MVT off: do not press "All HV OFF". Instead go to 'Restore settings' from the MVT overview screen:
- SafeMode.snp for beam tuning and Moeller runs
- MV_HV_FullField.snp for full solenoid field
- MV_HV_MidField.snp wgeb solenoid < 4T
CND CAMAC crate switch on / reboot:
If CAMAC crate (camac1) holding CND CFD boards is switched off for any reason, always reset the associated CND CFD thresholds by typing, ssh into clondaq3 and type:
$CODA/src/rol/Linux_x86_64/bin/cnd-cfd-thresh -w 0
If this command is failing and the crate is not responding, first reboot it as follows: roc_reboot camac1
and then repeat the threshold reset command above.
Solutions for common SVT issues: see 
RICH recovery procedures: 
To be followed in case of:
- DAQ crash: rich4 is not responding or
- RICH alarms (LV,missing tile, temperature, etc).
If it does not work or you are uncertain about what to do, contact the RICH expert on call. Please note that missing tiles typically occur due to lost communication. Keep in mind that the recovery procedure will kill DAQ. If DAQ is running for purpose other than data taking (for which the RICH acceptance is important) do not initiate the recovery procedure. The most critical parameter for the RICH is the temperature of the photosensors. If the temperature rises above limits, an interlock will automatically turn the RICH HV and LV off. If this happens, notify the expert on call and keep taking data without RICH.
Observed asymmetry in FTCal ADC Scalers
When running at low current (<10 nA), FTC asymmetries can be affected by hot channels. If large asymmetries are detected in those conditions, cross check with other detectors (BOM rates, DC occupancies) before taking further action.
CED display not showing events
Sometimes, CED screens are up but not active (events not showing at all). To solve this:
- Close the CED sceen
- ssh to clondaq4
- Once in the right machine, type ced, and wait for the windows to appear.
- Go to "File" -> "Connect to ET ring". Make sure to select clondaq6, as the online data is being streamed.
- Go to "Events" (same level as "File") and check "Auto Next-Event Every 2.0 sec" (if it is not selected).
You should see the events now, if all is working well.
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