Hall C IHWP Change Procedure

This is the procedure for Fall 2023-Spring 2024

When the IWHP is taken out or inserted, the flipper script must be run promptly in order to control the injector voltages. If the script is not run, the charge asymmetry will be very large until this is corrected. Running the script is usually handled by Hall A.

When the IHWP is going to be changed, Hall C staff should follow this procedure:

1. Inform Hall A and Hall B before changing the status of the IHWP. Generally, they prefer to be in between runs when the IHWP is changed, and all 3 halls should agree to the change.
2. Once the IHWP is changed, ask Hall A to run the flipper script.
3. If no one is available in Hall A, contact either Mark Mathison (email: mathison@jlab.org, phone on Hall C whiteboard) or Paul King (email: pking@jlab.org) to run the flipper script.
4. If you can't reach either of them, run the flipper script yourself. Instructions can be found on the SBS wiki (Sub-heading "What to do when the IHWP state is changed").
5. Once the flipper script is run, a log entry should be posted (see example: [1]). Find the new log entry to confirm that the script was run successfully.