------------------------------------------------------------ Date: Wed Aug 23 16:53:33 2000, Shift: 08:00-16:00 Supervisor: R. Debbe, with: Claus Ekman Log book#4 pages 146 - 150 Shift Summary: ------------------------------------------------------------ Machine status: One store started at 8:15 with ZDC coincidence rates around 120 Hz we collected data in run 2410 and then decided to scale down trigger 4 ( by a factor of 2) to reduce dead time. 2 Achievements: Runs 2410 and 2411 with some 250K trigger 1 events. MRS at 90 2Kgauss pol B FFS at 5 with T1 off At 11:00 a "quench link event " dumped the beam and RHIC went into maintenance mode and we were able to enter the IR to work on T1 T1 readout board was removed and inspected for broken wires; another broken anode wire was found. The new broken wires was located over the same guard strip and is the nearest neighbor to the wire removed on 8/21. The chances that this second wire broke because of electrostatic instabilities is high, we thus decided that the new readout board should be repaired in the lab. Meanwhile we will use the old board. During test in the lab the old board performed well but not as well as the new one. We decided that it would be good to have the ability to put some positive voltage on the field shaping wires, in order to have that choice we had to disconnect the gating grid pulser because it was using the cable intended for the field shapers. We will start by taking data at 8 degrees where we know that the gating grid was not necessary. ------------------------------------------------------------
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