Difference between revisions of "Engineering Run"
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== <font color=blue>''' Run Plan:'''</font>== | == <font color=blue>''' Run Plan:'''</font>== | ||
| + | * All studies for the next few shifts will take place with the empty hydrogen target, 100% torus field (negatives bending in), 50% solenoid field | ||
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| + | * Tune the beam to the Faraday Cup and complete harp scans at 2C21, 2C24, and 2H01. These scans should match the standard plots (see logbook links under "Beam Tuning") | ||
| + | * Perform a beam scan across the target using the horizontal correctors at 2H01 by several millimeters in each direction to find the center of the target. Move in 0.5 mm steps and record the 4 downstream halo counter rates at each position. Center the beam at the horizontal position that minimizes and balances the rates. Repeat the scan in the vertical direction by several millimeters in each direction to find the center of the target. The scans should proceed in each direction until the walls of the target are sensed. Record all rates in a table in the logbook | ||
| + | * Position the beam at the center of the target and turn on the FT-Cal HV and LV (contact the expert for instructions) and check the beam centering using the scaler GUI. Record the rates in the logbook. Due to the lack of cooling in FT-Cal, do not leave the power on for more than 1 hr | ||
* 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 2C24 and 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) | ||
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* 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 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). | ||
* 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 (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; | ||
| − | * Take data at different currents: duration and beam intensity will be established by beamline expert and SVT expert; for each setting record detector rates from scaler GUI and trigger rates. | + | * Take data at different currents: duration and beam intensity will be established by beamline expert and SVT expert; for each setting record detector rates from scaler GUI and trigger rates. For the higher beam currents, the DAQ rates will be too high (> 10 kHz). Contact the DAQ expert for instructions to change the trigger configuration file to set a higher ECAL energy threshold. |
* At the highest current setting, perform two 30 min runs with different trigger files: trigger_htcc.trg and trigger_htcc_pcal.trg | * At the highest current setting, perform two 30 min runs with different trigger files: trigger_htcc.trg and trigger_htcc_pcal.trg | ||
| + | * Note: For each beam energy, record the detector rates in the logbook. | ||
* 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 17:49, 13 December 2017
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Shift ScheduleShift ChecklistHot CheckoutBeam Time Accounting |
Manuals |
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JLab Logbooks
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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.
- To call JLab phones from outside the lab, all 4-digit numbers must be preceded by 757-269
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Click Here to edit Phone Numbers. Note, you then also have to edit this page to force a refresh.
CLAS12 Engineering Run, Fall 2017
Beam energy 10.6 GeV (5 pass)
Torus : 3770 A (100% field); Solenoid : 1208 A (50% field)
Important: Document all your work in the logbook!
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
Run Plan:
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General Instructions:
Beam Tuning:
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Every Shift:
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Every Run:
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Webcams |
Manuals |
Epics on the web
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