Difference between revisions of "Engineering Run"
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== <font color=blue>''' Run Plan:'''</font>== | == <font color=blue>''' Run Plan:'''</font>== | ||
| − | * Whenever preparing to receive beam, make sure the following conditions are established: all CLAS12 detectors are off and target is empty. For SVT, MVT, FTH and FTT, turn first HV off and then LV off. For any problem, consult with the expert-on-call. | + | * 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, turn first HV off and then LV off. For any problem, consult with the expert-on-call. |
* Establish beam to the tagger yoke first: | * 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. | *# 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. | ||
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*# 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. | *# 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/3502250 and https://logbooks.jlab.org/entry/3502252. 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. | *# 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/3502250 and https://logbooks.jlab.org/entry/3502252. 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 | + | * 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%. | *# 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; | + | *# 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 \Chromox" screen of the downstream viewer in beam position (if it is not already) | *# position 20 mm collimator on the beam and move \Chromox" 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. | *# move the beam blocker out: in this configuration beam current readings at 2C24, 2H01 and Faraday Cup should be close. | ||
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*# repeat harp scans at 2c21, 2c24 (tagger harp) and 2h01: profile should be as in https://logbooks.jlab.org/entry/3502250, https://logbooks.jlab.org/entry/3502252 and https://logbooks.jlab.org/entry/3502313. Make sure you select the proper PMT for the analysis. The profile at 2c21a and 2c24 should be as in the scans performed with beam to the tagger. If necessary ask MCC to adjust the beam profile at 2H01 to match the previous scan. | *# repeat harp scans at 2c21, 2c24 (tagger harp) and 2h01: profile should be as in https://logbooks.jlab.org/entry/3502250, https://logbooks.jlab.org/entry/3502252 and https://logbooks.jlab.org/entry/3502313. Make sure you select the proper PMT for the analysis. The profile at 2c21a and 2c24 should be as in the scans performed with beam to the tagger. If necessary ask MCC to adjust the beam profile at 2H01 to match the previous scan. | ||
* once beam tuning is complete move the beam blocker in (beam should be off for this), ask for 1.5 nA and ask MCC to unmask the FSD. | * once beam tuning is complete move the beam blocker in (beam should be off for this), ask for 1.5 nA and ask MCC to unmask the FSD. | ||
| − | * ask MCC to use BPM current readings from 2H01 for current lock (see https://logbooks.jlab.org/entry/3502484) | + | * ask MCC to use BPM current readings from 2C24 and 2H01 for current lock (see https://logbooks.jlab.org/entry/3502484) |
* turn on the forward carriage detectors: EC, PCAL, FTOF; check rates and record them in the logbook; | * turn on the forward carriage detectors: EC, PCAL, FTOF; check rates and record them in the logbook; | ||
* if rates are consistent with previous, proceed to turning on LTCC, DC, HTCC; | * if rates are consistent with previous, proceed to turning on LTCC, DC, HTCC; | ||
* turn on CTOF and CND; | * turn on CTOF and CND; | ||
* turn on FT-Hodo (FTH on epics); | * turn on FT-Hodo (FTH on epics); | ||
| − | + | * if rates are acceptable, contact Y. Gotra to turn on SVT and M. Defurne to turn on MVT and FTT; while Yuri will monitor the SVT, increase the beam current to 5 nA: to be able to do that, FSD thresholds that were set for 1.5 nA will have to be scaled up according to the current (the new thresholds have to be communicated to MCC that will set them in the system). | |
| − | * if rates are acceptable, contact Y. Gotra to turn on SVT; while Yuri will monitor the SVT, increase the beam current to 5 | + | * once all detectors are on, take data (PROD configuration and trigger_prod.trg) and online monitoring (CED and CLAS12MON); the run_control is open in a VNC session clonpc18: in case a run is already in progress, stop it and start a new run; |
| − | * once all detectors are on, | + | * take data at different currents: duration and beam intensity will be established by beamline expert and SVT expert. |
| + | * at the highest current setting, perform two 30 min runs with different trigger files: trigger_htcc.trg and trigger_htcc_pcal.trg | ||
* whenever beam is off but Hall A or C have beam, checks rates and beam current monitor readings looking for possible bleedthrough. | * whenever beam is off but Hall A or C have beam, checks rates and beam current monitor readings looking for possible bleedthrough. | ||
Revision as of 18:50, 12 December 2017
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CLAS12 Engineering Run, Fall 2017
Beam energy 10.6 GeV (5 pass)
Important: Document all your work in the logbook!
RC: Raffaella DeVita
- (757) 575-7540
- 9 575 7540 from Counting Room
- devita@jlab.org
PDL: Eugene Pasyuk
- (757) 876-1789
- 9 876-1789 from Counting Room
- pasyuk@jlab.org
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