Difference between revisions of "PITA scan HOWTO"
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*Turn Parity feedback off by doing ctrl-c (or ctrl-\) in the terminal running feedback. If feedback is stopped, runbird will show that Vpita has stopped changing every 10sec. (for details see [[Parity feedback HOW-TO]]) | *Turn Parity feedback off by doing ctrl-c (or ctrl-\) in the terminal running feedback. If feedback is stopped, runbird will show that Vpita has stopped changing every 10sec. (for details see [[Parity feedback HOW-TO]]) | ||
*Make sure beam modulation is not in the middle of a cycle (FFB should be unpaused and the terminal where BMW is running should say it's done with a cycle). Then turn off beam modulation by doing ctrl-c in the terminal. | *Make sure beam modulation is not in the middle of a cycle (FFB should be unpaused and the terminal where BMW is running should say it's done with a cycle). Then turn off beam modulation by doing ctrl-c in the terminal. | ||
| − | *once Parity feedback is stopped, call MCC and request the Rotating Half Wave Plate be set to | + | *once Parity feedback is stopped, call MCC and request the Rotating Half Wave Plate be set to 1046. The parity alarm will go off. This is ok. |
| − | *Start a new run and label it "Parity Scan" and in the comments say "PITA scan, RHWP= | + | *Start a new run and label it "Parity Scan" and in the comments say "PITA scan, RHWP=1046" |
*Do the following to run the auto-mated PITA scan ([[PITA scan]]) | *Do the following to run the auto-mated PITA scan ([[PITA scan]]) | ||
**ssh apar@adaq1 | **ssh apar@adaq1 | ||
| Line 10: | Line 10: | ||
*The auto-scan should take a just few minutes (so long as the beam is >67uA) and the PITA scan will set Vpita +-1000counts or so. You'll be able to see Vpita change in the terminal, in runbird, or in the Parity RTP Screen. | *The auto-scan should take a just few minutes (so long as the beam is >67uA) and the PITA scan will set Vpita +-1000counts or so. You'll be able to see Vpita change in the terminal, in runbird, or in the Parity RTP Screen. | ||
*When the script ends, the terminal will stop outputting text and Vpita should have returned to its orginal value. | *When the script ends, the terminal will stop outputting text and Vpita should have returned to its orginal value. | ||
| − | *Call MCC and request the Rotating Half Wave Plate be set back to | + | *Call MCC and request the Rotating Half Wave Plate be set back to 1468. |
*Go to the Parity alarm handler and make sure all the alarms have been turned back on and are reading green. | *Go to the Parity alarm handler and make sure all the alarms have been turned back on and are reading green. | ||
*Restart Parity feedback in the terminal by typing ./feedback_ana (see https://prex.jlab.org/wiki/index.php/Parity_feedback_and_Analysis_Minder for help). Make sure it's running by checking that Vpita changes every 10sec | *Restart Parity feedback in the terminal by typing ./feedback_ana (see https://prex.jlab.org/wiki/index.php/Parity_feedback_and_Analysis_Minder for help). Make sure it's running by checking that Vpita changes every 10sec | ||
*Turn beam modulation back on. Do the clear command in the BMW terminal, then do the BMW command as per instructions here [[How to run]] | *Turn beam modulation back on. Do the clear command in the BMW terminal, then do the BMW command as per instructions here [[How to run]] | ||
*End the run. Start an new production run (remember to set the run type to Production and remove the comment about "PITA scan") | *End the run. Start an new production run (remember to set the run type to Production and remove the comment about "PITA scan") | ||
Revision as of 18:22, 5 January 2020
- If a production run is going, end the run
- Turn Parity feedback off by doing ctrl-c (or ctrl-\) in the terminal running feedback. If feedback is stopped, runbird will show that Vpita has stopped changing every 10sec. (for details see Parity feedback HOW-TO)
- Make sure beam modulation is not in the middle of a cycle (FFB should be unpaused and the terminal where BMW is running should say it's done with a cycle). Then turn off beam modulation by doing ctrl-c in the terminal.
- once Parity feedback is stopped, call MCC and request the Rotating Half Wave Plate be set to 1046. The parity alarm will go off. This is ok.
- Start a new run and label it "Parity Scan" and in the comments say "PITA scan, RHWP=1046"
- Do the following to run the auto-mated PITA scan (PITA scan)
- ssh apar@adaq1
- cd ~/yufan/scan
- ./scan.py pita
- The auto-scan should take a just few minutes (so long as the beam is >67uA) and the PITA scan will set Vpita +-1000counts or so. You'll be able to see Vpita change in the terminal, in runbird, or in the Parity RTP Screen.
- When the script ends, the terminal will stop outputting text and Vpita should have returned to its orginal value.
- Call MCC and request the Rotating Half Wave Plate be set back to 1468.
- Go to the Parity alarm handler and make sure all the alarms have been turned back on and are reading green.
- Restart Parity feedback in the terminal by typing ./feedback_ana (see https://prex.jlab.org/wiki/index.php/Parity_feedback_and_Analysis_Minder for help). Make sure it's running by checking that Vpita changes every 10sec
- Turn beam modulation back on. Do the clear command in the BMW terminal, then do the BMW command as per instructions here How to run
- End the run. Start an new production run (remember to set the run type to Production and remove the comment about "PITA scan")
