Log entry time 22:25:32 on March 23, 2004

Entry number 80144

Run Coordinator's Report - 22 March Swing to 23 March Day

Summary

• Finished tuning up injector and accelerator to deliver transversely polarized beam.
• Had some difficulty in getting the feedback devices calibrated and operational with transverse beam (80014). They all appear operational now (80078).
• Have taken 9+ hours of production data on LH2 and 2+ hours on Al frame with transversely polarized beam. We would be further along but lost significant time overnight to various faults in the accelerator on owl shift (5+ hours).

Concerns and Resolutions

• Unfortunately, changing the VXI crate for the French electronics does not appear to have improved any of the three problems associated with the French electronics: spikes, non-statistical widths in detectors 13 and 14 of octants 4 and 8, and high Silviu ratio in detectors 1 and 2 of octants 2 and 6 (79882). There are still things to try, including replacing or changing the location of the interface board in the VXI crate. These tests are waiting a good time in the run plan to perform.
• So that it is clear that I am not picking on the French, we are having recurring problems with LTD errors in the NA electronics. Paul has asked that the canonical "wiggling" of the cables by untrained shift crew cease in order to avoid damaging the connectors (80119). The preferred procedure is to reseat the cable connectors in the sockets, however this requires some additional training/experience. When in doubt, contact Paul or a NA electronics expert if one is available.
• Not a concern but a comment, we have started taking four hours of GMS data a day again. We had gotten away from that for some reason over the weekend. Have also dropped the frequency of 120 Hz runs to something more on the order of once very 12 to 24 hours.

Plans

We will take data with transversely polarized beam for the remainder of the week. Originally we were scheduled to go to the other transverse Wien setting (approximately +93 degrees) tomorrow afternoon but after some discussion it was decided that we were better served by getting all the statistics that we can at this Wien setting. This evening we changed the state of the insertable half wave plate after taking 9 hours of data on LH2 and 2 hours on Al frame. We will take 18 and 4 in this IHWP state before changing again and taking 9 and 2. On Friday we will do a mini-mini-spin dance to get back purely longitudinal polarization and resume normal running through the weekend.

Summaries and ABUs

• Monday Swing: Summary and ABU
• Tuesday Owl: Summary and ABU
• Tuesday Day: Summary and ABU