User name Ulmer
Log entry time 16:02:08 on June20,2002
Entry number 86506
Start shift on kinematics Q2D_g40 with 90+ uA beam.
08:55 ROC 14 crash. Resetting crates.
09:05 Back up and running.
09:15 We tested (again) the Left bogie control and again the GUI would
not pop up. So rebooted the crate and now the GUI pops up and we are
able to enable the PS, etc. We are not ready to actually move the Left
spectrometer for some time, but just wanted to make sure it would work
10:10 ROC 14/1/2/3 problems. Resetting didn't work. Communication
failures rampant. "Domain not bound" errors, ssh not working ...
Bob Michaels is on his way to troubleshoot.
10:20 MCC informs us that there are current trips and we will be getting pulsed
10:30 MCC tells us we will be now getting some CW beam.
10:55 Beam is back at 100 uA. We (Bob) are still dealing with DAQ problems
11:10 Ask for controlled access to reset network switch. No effect.
11:30 Out of controlled access.
12:15 DAQ problem solved with help of Bob and Computer Center. Both adaqep
and adaqcp, which are yp slave-servers, required rebooting. Problems with
these machines gave problems with the Sun workstations which then
made rebooting the ROC's impossible.
12:20 Restart acquisition at 100 uA.
15:45 MCC says they lost gun voltage and North linac dropped from beam
permit to power permit with no indicated fault. Beam should be back
15:50 Beam back.
Run Summary for all good Q2D_g40 runs so far (goal = 400 counts)
Run Events Counts (running total)
1684 pointing run (previous shift)
1685 0.57M events (previous shift) - 33 counts
1686 0.48M events (previous shift) - 55 counts
1687 1M events (in progress at shift start) - 110 counts
1690 1M events - 150 counts
1693 1M events - 195 counts
1694 1M events - 234 counts
1695 1M events - 279 counts
1696 In progress at end of this shift.
We get about 40 trues into all cuts per 1M events and 1M events takes about
1 hour of steady 100 uA running. Given we want 400 counts total, this amounts
to about 9-10 hours, instead of the 5.5 hours predicted. We started production
running at about 06:30 (previous shift). The prediction of 5.5 hours would mean
that with 60% efficiency we expected to finish this point at 15:30 or so.
We could, instead, take 75% of the 400 counts = 300 counts and finish at about 16:30. Let's finish at 17:00 with this point (including efficiency measurement).
At this time, Bodo can begin the ep and we will change setting to Q2D_g50.
The arc energy measurement is deferred until tomorrow when we change settings
again (either after Q2D_g50 or after Q2D_i20).