------------------------------------------------------------ Date: Tue Oct 30 08:04:12 2001, Shift: 00:00-08:00 Supervisor: DO, with: Log book#10 pages 71 - 73 Shift Summary: ------------------------------------------------------------ 1.Machine status: MCR provided very good beams most of the night. The store started around 2:00, the ZDC coincidence rate was around 1000. After 4 hours, it went down to 220. At 8:00, ZDC around 150. Voted for a dump with Phenix. 2.Achievements: Runs Trig 6 Setting 5574 42k MRS 40, 6B FS 8, 1/5 B 5577 44k idem 5578 56k MRS 45, 4B FS 8, 1/5 B 5580 72k MRS 45, 4B FS 8, 1/5 A (no DC data) 5581 13k same setting, got back T3 and T4 (not T5) 3.Detector problems: A problem at run start time, had to restart the DAQ IO and Run servers, otherwise things work really good until 4:30, no problems at all. The D3 anode currents seemed too high (58, 52, 47). After the change in the FS polarity, started run 5579. 3mn after, a big bad trip!!! T2, T3, T4, T5. I took me around 40mn to get T2, T3 and T4 back. Some channels refused to cooperate whatever action taken (turn off/on, decreased HV, turn off/on all, etc). It was really frustrating because of the nice store we had. Finally, T5 cathode 2 kept on tripping all the time and T4 was unstable (cf. logbook for more details). I had to take the decision to run without the DCs. So, run 5580 is without DC data. Finally, could get back T3 and T4 to work but not T5, cathode 2 always trips. Run 5581 is without T5. ------------------------------------------------------------
This archive was generated by hypermail 2b30 : Tue Oct 30 2001 - 08:04:59 EST