Difference between revisions of "PITA scan HOWTO"
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*one Parity feedback is stopped, call MCC and request the Rotating Half Wave Plate be set to 500. The parity alarm will go off. This is ok. | *one Parity feedback is stopped, call MCC and request the Rotating Half Wave Plate be set to 500. 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=500" | *Start a new run and label it "Parity Scan" and in the comments say "PITA scan, RHWP=500" | ||
| − | *Do the following to run the auto-mated PITA scan | + | *Do the following to run the auto-mated PITA scan (For further details on the PITA scan script see [[PITA scan]]) |
**ssh apar@adaq1 | **ssh apar@adaq1 | ||
**cd ~/yufan/scan | **cd ~/yufan/scan | ||
| Line 12: | Line 12: | ||
*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) | *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) | ||
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Revision as of 16:27, 3 August 2019
- 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.
- one Parity feedback is stopped, call MCC and request the Rotating Half Wave Plate be set to 500. 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=500"
- Do the following to run the auto-mated PITA scan (For further details on the PITA scan script see 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 1.
- 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)
