Status of Left and Right Q1s

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User name Jack (Techs)

Log entry time 08:00:06 on April 03, 2009

Entry number 266638

keyword=Status of Left and Right Q1s

New drives for the DCCTs were installed and new control boards. At this time, neither of the quads have remote control. That should be resolved soon. In local control the RQ1 was taken to 3.29GeV, the LQ1 was taken to 3.98GeV. The supplies seemed to be well behaved. During the work on the RQ1 the Saclay rack had a fault that seemed to be persistent. No fault lights were lit on the modules, yet the "Spare" fault was evident on the power supply. I verified the supply was seeing a fault signal. While continuing to work my way along the signal chain, the fault spontaneously cleared. It has some of the characteristics of a latch-up in CMOS circuitry. It is something that bears more investigation.