Day shift summary

keyword=Day shift summary

Summary for October 10, Day Shift

People in counting house:

Main Events/Issues:

08:00 Beam down due to ARC dipole trip
08:10 L_MAG alarm - clears itself before I can see what it is
08:30 MCC estimates ~15 minutes until sending tune beam
08:45 L_MAG alarms 2 times in quick succession - second time, lock lost but "fixed itself" after about 30 seconds
10:00 MCC starting to try to send tune beam in the injector
10:26 moved the target out for Moller measurements
11:14 turned off spectrometer HV for cosmic testing with the calorimeter
11:30 cryo temp dropped b/c of issue with Hall C target
12:00 Bit of a bottleneck with ARM/operators - Hall C is using the ARM.
12:10 Hall C finished with the survey - sent the ARM to Hall A - Jixie and Carlos go in.
12:46 Jixie and Carlos out of hall
14:02 Called for a controlled access for Moller: Sasha in and out.
14:30 Turned on spectrometer HV in preparation for resuming the run plan.
15:00 Get beam back; perform beam recovery procedure - raster increased to 4x4mm^2
15:25 Move to 15 cm LH2 target, do spot++
15:45 Begin the first elastic calibration run of this shift
16:00 End shift with elastic calibration in progress

Summary:

There were multiple alarms for the NMR and it lost the lock, though it seems to recover by itself. There was no beam all morning. Sasha and crew came in and there was still no beam, but MCC was sending tune beam to the injector. Miscommunication caused us to think there was a bottleneck with the ARM - MCC didn't mention that Hall C wanted a survey (and not a long escorted access) which caused some consternation on the part of the Moller folks who needed to fill the Moller magnet.
There was some difficulty in turning on the solenoid, so the Moller running was postponed and we prepared for resuming the run plan.
Resumed the run plan at the lowest momentum setting (-4%) for the seive-out elastic calibration. Need 3 additional 1-hour long runs for this setting.

Run Summary:

7111-7120 - Tests; Alex did some cosmics, DAQ tests and
7121 - Empty target, 5uA, spot++ run (rates too low)
7122 - Empty target, 5uA, spot++ run - looks good
7123 - 15cm LH2 target, 3uA, spot++ run
7124 - 15cm LH2 target, 10uA, 3.194 GeV/c (p0=-4%), sieve out - first calibration run this shift

A copy of this log entry has been emailed to: riordan@jlab.org, munoz@jlab.org, jroche@jlab.org, camsonne@jlab.org, sabatie@jlab.org