Difference between revisions of "Run Group M"
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== <font color=blue> Notes </font> == | == <font color=blue> Notes </font> == | ||
| − | + | # '''LTCC is NOT used''' in this experiment. HV should be kept OFF. | |
| + | |||
| + | # 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 access, they should be switched off when leaving the Hall. Refer to these photos: | ||
** ON: [https://logbooks.jlab.org/entry/3825712] | ** ON: [https://logbooks.jlab.org/entry/3825712] | ||
** OFF: [https://logbooks.jlab.org/entry/3825731] | ** OFF: [https://logbooks.jlab.org/entry/3825731] | ||
** Note that the dome lights when switched off cannot be turned back on immediately because they require 10-15 min to cool down. | ** Note that the dome lights when switched off cannot be turned back on immediately because they require 10-15 min to cool down. | ||
| − | + | # 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. | |
** The integrated rates on the upstream counters have to be in the range 0-15 Hz (rates up to 100 Hz are acceptable) and the rates on the midstream counters have to be in the range 10-20 Hz (acceptable up to 50 Hz) @50 nA. Counting rates in the range of hundreds of Hz may indicate a bad beam tune or bleed-through from other Halls. | ** The integrated rates on the upstream counters have to be in the range 0-15 Hz (rates up to 100 Hz are acceptable) and the rates on the midstream counters have to be in the range 10-20 Hz (acceptable up to 50 Hz) @50 nA. Counting rates in the range of hundreds of Hz may indicate a bad beam tune or bleed-through from other Halls. | ||
| − | + | #: When the '''beam is being delivered to the Faraday Cup''': | |
*# the Fast Shut Down elements: Upstream, Midstream, Downstream, BOM, and Solenoid should always be in the state <font color=red>UNMASKED</font> | *# the Fast Shut Down elements: Upstream, Midstream, Downstream, BOM, and Solenoid should always be in the state <font color=red>UNMASKED</font> | ||
*# No changes to the FSD threshold should be made without RC or beamline expert approval | *# No changes to the FSD threshold should be made without RC or beamline expert approval | ||
| − | + | # Do not run more than 30 minutes with >150 W beam to Faraday cup without the beam blocker, eg https://logbooks.jlab.org/entry/3979277 | |
| − | + | #: Any request for a '''special run or change of configuration''' has to be approved by the RC & documented | |
| − | + | # Do not turn OFF FTOF HVs, even during the beam tune with CW beam (turn off if tuned/pulsed beam in the upstream beamline) | |
| − | + | # 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. | |
| − | + | # '''Reset the online monitoring histograms''' frequently to avoid histogram saturation. | |
| − | + | # In case of a '''Torus and/or Solenoid Fast Dump''' do the following: | |
*# Notify MCC to request beam OFF and to drop Hall B status to Power Permit | *# Notify MCC to request beam OFF and to drop Hall B status to Power Permit | ||
*# Call Engineering on-call | *# Call Engineering on-call | ||
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*# Turn off all detectors | *# Turn off all detectors | ||
| − | + | #: If responding to '''RICH or Trigger alarms''' please post screens also to RICH or HBTRIGGER logbook, respectively. | |
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Revision as of 17:18, 30 January 2022
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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.
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Click Here to edit Phone Numbers. Note, you then also have to edit the current page to force a refresh.
CLAS12 Run Group M, Fall 2021
Beam energies: 2.1, 4.0, 6.0 GeV (1.96 GeV/pass)
RC: Sebastian Kuhn
- Sebastian Kuhn (757) 639-6640, kuhn@jlab.org
- 9 575 7540 from Counting Room
PDL: Valery Kubarovsky
- (757) 876-1789
- 9 876-1789 from Counting Room
- vpk@jlab.org
Jan 27 - 29, 2022
4GeV 22nA on LAr
Run Plan: Jan 30 - Jan 31, 2022
Production runs use PROD67_noVTPread and the trigger rgm_6GeV_inb_v1_0.trg .
Run duration 100M events or 4 hours, whichever comes first.
- LAr target is empty, cell stays in position
- Beam blocker IN
- Empty target run
- FC calibration (4GeV) is done
- Take 2 hours of empty target run at 150 nA
- Carbon target (single foil 2 mm) IN
- FC calibration for C target is loaded
- Run with 90 nA
- Monday pass change (6GeV beam)
- Need to establish quality beam, repeat beam centering, beam blocker calibration.
- OUTLOOK: Run on Ar, Sn and C with 6 GeV beam
DAQ configuration
PROD67_noVTPread , production trigger rgm_6GeV_inb_v1_0.trg .
At the end of each run, follow the STANDARD DAQ RESTART SEQUENCE
- "end run", if the run ended correctly then: "prestart", "go"
- if the run did not end correctly or if any ROCs had to be rebooted:
- "cancel", "reset"
- "configure", "download", "prestart", "go"
- 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
(last update 01/18/2022- 23:30)
Nominal Beam Positions
- 2H01, X: -0.6 mm, Y: 0.8 mm
- 2C24, X: -2.0 mm, Y: +0.6 mm
FSD Thresholds
- Upstream: 2000 Hz
- Midstream: 2000 Hz
- Downstream: 500000 Hz
- BOM: 10000
- 5 ms dwell time
Reference Harp Scans for Beam on Faraday Cup: 2H01 [1]
Reference Harp Scans for Beam on Tagger dump: 2C21 [2], tagger harp [3]
Reference Monitoring Histograms (6 nA, production C) [4] Old reference Monitoring Histograms (50 nA, production LD2) [5]
Counter rates
- Upstream counters integrated rates: 0-15 Hz (acceptable up to 100 Hz are acceptable) @50 nA.
- Midstream counters: 10-20 Hz (acceptable up to 50 Hz) @50 nA.
- Counting rates of ~ hundreds of Hz may indicate bad beam tune or bleed-through from other Halls.
Beamline vacuum: should be not higher than 5e-5.
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