Fig 1: The final hour of data in IBC2C24, prior to the shutdown for the SAD. Noise is evident.
Fig 2: Signal injection on the test port, representing various beam currents. No noise evident, especially not in comparison to Fig 1.
Fig 3: Confidence test results: 1195 nA / 0.24 (cal factor) = 4.98 uA.
This test rules out the cavity cable/connectors, and electronics, as a source of the noise in question.
While working in building 68 I noticed the back room that houses the Vertical ssAs was very warm - the AC wasn't cooling. Also noticed Cavity 3's SSA had tripped.
Archived forward power showed the trip happened around 7:05. The SSA tripped and showed a mismatch and DC power fault - see the attached figure. Notified the
Crew Chief about the AC and SSA trip and started an SSA restart.
1L05-8 produces too much heat for usual circumstances. Others in the zone aren't much better, which is why it is getting pulled in October and C75-1 installed. Figure 2 shows that we have a fair amount of heater margin in the NL. lem predicts that NL fault rate will drop 3/shift is 1L05-8 is brought back up at 3 MV/m. If CAPHTRMGN doesn't drop by more than 3 W (*18) at this setting, go ahead.
Optimization of injector:
1. Adjusted orbit in 0I and 01 regions
2. Restored HWien setting
3. Increased prebuncher amplitude from 8 to 9
4. Backed out RF 0L04 gang phase offset by 1 deg
5. Verified no leak from A or C to B at chopper
6. Hall A verified PQB
The OPS DRVHs for the following cavities have been updated:
RF Status: Good
Tuner Status: Good
Comment: DRVH=9.600 eight faults range 9.7 to 9.9 (energy lock cavity)
Previous OPS DRVH: 0
A and C slits closed, B slit open to 17.65:
Fig. 1: All beam off, Fcup# = 0.0106
Fig. 2: A at high current setting (135uA), Fcup# = 0.0106
Fig. 3: C at high current setting (40uA), Fcup# = 0.0106
It does not appear to be any leakage from A or C to B.