User name gilman
Log entry time 23:39:10 on September 26,1999
Entry number 27236
keyword=shift summary - 9/26/1999 swing shift
Finish up 53 degree cm point. Lose ~1 hour dur to accelerator problems
+ shift checks.
Because e-arm change is 5 minutes to setup for 12C data, but it also
is 5 minutes to change targets, decide to do 12C data to start the 70 deg cm point.
Run 1854: start 17:40, 20 minutes long, 16 k e+12C events for alignment.
Switch to radiator out, raster on, proton target.
Run 1855: start 18:10, end 19:10, 101 k events
Beam current oscillations have reappeared, as of ~ 18:00. Notice this around
18:30, warn MCC around 18:50.
18:25: Notice filtering ended at run 1836, taken about 3 pm - 5 pm yesterday.
Restart it up. It looks like no disk has > 15% free space, so it is just marking time
18:35 shift checklist done.
18:53 MCC says accelerator energy stepped off by 10^-3 for 1 minute
starting at this time, then they brought it back.
19:10 switch to e + deuteron target
Run 1856 started 18:15
19:22 Coda 100% dead. All components seem to be up. Called Bob.
19:30 Beam is down for 5 minutes for injector correction.
19:36 Beam is back.
19:47 Bob finished remote diagnostic (see log entry 27231). Ended run1856.
Started run 1857. Stopped 21:20 with 259 k events.
20:04 MCC called. They have someone looking into observed since 17:30 current
oscillations (amplitude of oscillations ~5uA, period ~20min). They suspect something with RF.
20:45 Oscillations come from injector MCC says. Experts coming in.
21:21 Started run 1858. Beam taken away 21:45 for injector work. Run stopped 22:10 with 95 k events.
22:45 MCC calls, phase problem in injector still being tracked down, then
injector person needed for retune. Experts estimate 1 hour + ==> beam
maybe midnight. Decide to put in radiator for benefit of overnight shift
not having to do much.
Since this shift saw the start os current oscillations and many hours
without beam, + 1 DAQ crash, it has not been as positive an experience
as one would have hoped. I submit this early, assuming beam will not return
in next 15 minutes.