Upstream rates started creeping up after increasing Hall C current to 70 uA. Looks like the Arc2 orbit lock aiming for 5.5 mm on the 2E02 X BPM is not currently ideal at this current. Turned the orbit lock off, bumped steering 0.25 mm toward recirculation, and rates are looking better now.
The only impact this should have on operations is that during the data collection intervals the higher passes at 1A08 and 2A08 will be unavailable since the muxers will be locked on first pass. 1A08 and 2A08 will continue to act completely normally (except that they may update slightly faster since they won't have to wait for muxing). There is no reason to remove them from BEM or the energy locks. Using FastSEE Light has no impact on normal Ops usage of SEE bpms, by design.
Thank you for submitting this task. This one could break many different ways -- a BSList, a SWList, an ATLis. We'll keep it as an ATLis, but before approval and scheduling I'd like a few others to review in addition to me.
0) CASA, Ops: Please review and comment on any outstanding questions or concerns. If none and this should be approved, please comment as much as well.
One concern I have is regarding switching to FastSEE mode on 109 BPMs mid-running. This has the potential to drive off orbit and energy locks throughout the machine, if my understanding is correct.
ACG established the needed screen/controls to allow for channel access from Hall D to the Injector PVs. Hall D wants to do feedback on its charge asymmetry. Recall that we are temporary using Hall A IA controls for this.
The list of the PVs are:
C1068_QDAC03
C1068_QDAC04
C1068_QDAC05
C1068_QDAC06
Degrading klystron drive was discovered at the end of the maintenance day yesterday, and GASK is maxing out trying to run at 70 uA to Hall C. Derated it down to 8.5 MV/m and it's hanging in there aroun 8.3 V GASK, so leaving it there for now. Amp and drive output need to be checked on a maintenance day.
Figure 1: 24 MeV of headroom in the NL. Nice. Friday, if memory serves, we had ~7 MeV, dicey -- a C100 cavity away from not being able to make energy.
Figure 2: 45 MeV of headroom in the SL.
Figure 3: Using reCap, 5 cavities recovered yesterday still in use this morning.
| Shift | Swing |
|---|---|
| CEBAF Program | |
| MCC Crew Chief | Schoene |
| MCC Operators | Richardson, Anthony, Shriner |
| Program Deputy | Park |
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