Difference between revisions of "Engineering Run"

From clas12-run
Jump to navigation Jump to search
Line 89: Line 89:
 
== <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
+
* All studies for the next few shifts will use 100% torus field (negatives bending in); the strength of the solenoid field and the status of the hydrogen target are listed below
  
 +
* Before beam is restored:
 +
** complete the work to put the solenoid in the FSD (and test that it works before delivering beam to the Faraday cup)
 +
** ensure that the solenoid is ready/safe to go to full field (but leave at 50% field for initial beam delivery)
 +
** ensure that the hydrogen target is ready to fill (but leave the target empty)
 +
** ramp the tagger magnet to the field for beam tuning to the tagger yoke dump
 +
 +
* After the beam is restored in the early afternoon, tune the beam to the tagger yoke dump. Ensure that the BPM positions at 2C21 and 2C24 are correct and that the harp scans are acceptable
 +
* After the beam in the upstream line is acceptable, call for MCC to turn off and degauss the tagger magnet (this will take 30 min)
 +
* Ensure that the solenoid is unmasked in the FSD system
 
* 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")
 
* 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 with 1.5 nA beam and perform whatever beam steering at 2C21 and 2H01 is necessary to match the rates seen with last night's tune.
−
* 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 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)
 
* Turn on the Forward Carriage detectors: ECAL, FTOF; check rates and record them in the logbook;
 
* Turn on the Forward Carriage detectors: ECAL, FTOF; check rates and record them in the logbook;
 
* If rates are consistent with previous good beam tune, proceed to turning on LTCC, DC, HTCC;
 
* If rates are consistent with previous good beam tune, proceed to turning on LTCC, DC, HTCC;
−
* Turn on CTOF and CND;
+
* Turn on CTOF,CND, FT-Hodo;
−
* 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 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; Take a 1 hour long data run at 5 nA.
+
* Once all detectors are on, record rates in all detectors, and currents in the DC, SVT, and MM, at solenoid field settings of 50%, 60%, 70%, 80%, 90%, and 100%. Make
−
* 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. (For 1.5 nA use trigger_mip.trg; for higher currents used trigger_elec.trg).
+
sure that the logbook information is complete and readable!
−
* At the highest current setting, perform two 30 min runs with different trigger files: trigger_htcc.trg and trigger_htcc_pcal.trg
+
* At 100% solenoid field, record rates in all detectors, and currents in the DC, SVT, and MM, at beam currents of 5 nA, 15 nA, 25 nA, ... The beam intensity and duration will be established by the beamline expert and the SVT and MM experts. Make sure that the logbook information is complete and readable!
−
* Note: For each beam energy, record the detector rates in the logbook.
+
* At 100% solenoid field take 30 of data at the highest current authorized by the SVT/MM folks (ensuring that the DC and other detector currents/rates are acceptable). Select the trigger file based on high threshold ECAL clusters (to select electrons). Contact the DAQ expert to set this up.
 +
* Fill the target. Contact Engineering on-call to complete this work.
 +
* Restore beam to the Faraday cup at 0.5 nA. Record rates in all detectors, and currents in the DC, SVT, and MM, at beam currents of 0.5 nA, 5 nA, 10 nA, 15 nA, ... The
 +
beam intensity and duration will be established by the beamline expert, the SVT and MM experts, the DC experts, and the Forward Carriage experts.
 +
* Allocate several hours to work on detector optimization. This includes:
 +
** Reduce the DC time windows closer to their nominal production values
 +
** Reduce the FTOF and CTOF TDC time windows to match the FADC time window (400 ns). Ensure that the real timing peak is properly centered in the time window.
 +
** Set the detector threshold to nominal values for initial data taking
 +
** In all cases, contact the associated detector subsystem experts to complete this work in conjunction with the DAQ expert
 +
* Record data for 2 hours with the high threshold ECAL cluster trigger and the random trigger. Contact the DAQ expert to set this up.
 
* 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 14:56, 14 December 2017

[edit]


Clas12design.png

Retrieved from "https://wiki.jlab.org/clas12-run/index.php?title=Engineering_Run&oldid=451"