Log entry time 16:50:44 on March 26, 2004

Entry number 80480

Run Coordinator's Report for 25 March Swing to 26 March Day

Summary

We enjoyed a nice, quiet night of data taking and got a lot of data on tape. There is about 5.25 C of LH₂ and 0.5 C of Al running with transverse polarization on tape. This morning the beam polarization was made longitudinal again and there was 40 ľA in the hall by 13:00.

Significant News

• Kaz tried a new technique for determining the IA/PZT slopes (80385). It appears to have worked; feedback ran smoothly through the night (80434).
• There was a period of time over owl shift where the FSD rate became quite high (80401). This was eventually found to be due to a failure of the fault rate counter in the MCC (elog 1202963). This counter points out offending cavities so they can be adjusted appropriately (elog 1202984).
• There was at least one spiky run overnight (80414).
• On day shift we performed a micro spin dance to verify our transverse polarization and set up for longitudinal running. We learned a number of interesting things:
  • The transverse polarization had drifted about 2.5° from where we set it up on Monday (80432 and 80435).
  • The anticipated longitudinal Wien setting had shifted slightly, by about a degree (80448). The Wien filter has been set to 2.5° to provide longitudinal polarization for the remainder of the run. The previous setting was 11°.
• A Mott measurement was performed during the micro spin dance (elog 1203004) but results are not available yet.
• Paul swapped the slot order of DMCHs 1-4 at the request of the French electronics experts (80450). The idea was to make the distribution of detectors in the octants symmetric about the interface box in the VXI crate, i.e. all detector 16s would be the same number of slots from the interface box. Possible signal attenuation across the backplane from the interface box is one of the potential causes for the various French electronics difficulties having to do with asymmetry widths. Unfortunately, this change turned out to require a software as well as a hardware change and was backed out.

Plans

1. Steady running with 40 ľA, longitudinally polarized beam on LH2.
2. Four hours of GMS data every day on swing shift.
3. A BPM/BCM calibration on Saturday day shift.
4. Our next polarization measurement and halfwave plate change will occur on Monday after the beam studies.

Concerns

• Non-statistical widths in detectors 13 and 14 of octants 4 and 8
• Elevated Silviu ratio in detectors 1 and 2 of octants 2 and 6
• Spikes in French electronics
• Apparent increasing frequency of NA LTD errors
• Crosstalk with target IOC and target FSD box when the Musson box is rebooted remotely
• Changed behavior of BPM 3H00C Y position with respect to other hall BPMs

Shift Summaries and BTA Reports

• Thursday Swing: Summary and BTA
• Friday Owl: Summary and BTA
• Friday Day: Summary and BTA