Log entry time 19:17:46 on December 14, 2003

Entry number 71224

Run Coordinator's Report - 14 December 2003

General Comments/Problems/New Information

Not the most productive of days between electronics problems (see below) and Hall A energy measurement.

New Information

• Shift crew needs to be paying attention to the LTD error lights while taking data. If the LTD error lights start flashing, then call in the NA electronics expert. The error lights are visible in the upper left quadrant of the TV screen showing four different views in the electronics cage. The lights must be off in the cage for the error lights to be visible.
• There were some reports that beam time accounting software was miscalculating ABUs over the swing/owl shift. This is because we were running at 1 uA and the software threshold was set higher than that. It was a nonobvious error because the threshold is essentially invisible due to a lack of available colors on the machine the BTA software is running on.

Corrections

There was at least one error in my previous RC report. I said we needed to take 30 hours of data on the radiator alone to help nail down our background asymmetry. I meant to say 30 hours on flyswatter alone (Thanks Serge).

Past 24 Hours

Swing

Started the shift closing out the Moller systematics program and then taking some short runs to set PID cuts for use in the CFD threshold study program to be run overnight. Then the problem associated with the Musson box and the change to chopper slit A discussed in yesterday's RC report was discovered and corrected (g0log 71103). Unfortunately, a fake KGB signal source was used in making the adjustment and not replaced with the real source until day shift (71172). The NA time encoding data taken overnight as part of the CFD threshold study was compromised and will probably need to be retaken. Kaz took another RIP (RHWP/IA/PZT) scan and got the beam feedback ready to go. The beam went down for a couple of hours due to a loss of communication with one of the zones in the linac.

Owl

This shift began with the CFD threshold study needed to perform the Q2 and centering (as mentioned above this data will probably need to be retaken. Another RIP scan was taken and one feedback run started before end of shift.

Day

The beam went away at 09:00 for the Hall A energy spread minimization program. In the morning we took several runs with no beam in order to look at pedestal differences. Paul and Dominique did some DAQ work in the afternoon. We were unable to get a hold of John Musson so we did not get a Musson box firmware upgrade today. Dave Gaskell did use his time as shift leader of a shift with no beam to do some more analysis of the Moller data he took the previous day (71169, 71170, 71174). Essentially, Dave saw no change in polarization as he went up to 10 uA in beam current or changed the laser phase.

Future Plans

Sunday Swing/Monday Owl

1. RIP Scan
2. Halo Calibration
3. Deadtime Studies with Fastbus
4. Beam Feedback Runs on LH2
5. RIP Scan

Monday Day

Beam will be off to repair Hall C chopper slit and install Wien quad in injector. Opportunistic access to install Musson box firmware upgrade and remove TLDs.

Monday Swing

1. CFD Threshold Study
2. RIP Scan

Tuesday Owl

1. Beam Feedback Runs on LH2
2. RIP Scan

Tuesday Day

1. Energy Measurement
2. BPM/BCM Beam-Based Pedestal Calibration
3. Fast Raster Calibration
4. BPM Calibration (by moving beam)

Tuesday Swing

Q2 Measurement (magnetic field study)

Wednesday Owl

Beam Centering Measurement