more on this morning's bursts
Kate Scholberg (kate@cithe308.cithep.caltech.edu)
Fri, 1 Sep 1995 23:18:29 -0700 (PDT)
Having heard from Gran Sasso folks about various odd things which
happened during the day, I think the most likely explanation for this
morning's bursts is that they were associated somehow with the power
flicker that caused the SM 3 and 4 power to trip off. The bursts
happened at the very end of run 10825: this run was mostly normal, but
rates in SM's 2 and 4 increased dramatically right at the very end of
run 10825 (and microvax 2 was absent in the subsequent runs, so I
assume this is the time when the power tripped). The increase in
happened only in the bottom part of SM 2 and the top part of SM 4
(confined to particular HV cards perhaps?), with some tanks in this
subset hotter than others. The pattern is consistent with, say, a
power-flicker-related HV increase in a few particular HV cards,
weirdness affecting a particular subset of ERP modules, or some such thing.
The spark-catcher didn't reject this burst-- although most hits were
in a handful of boxes, there were still too many different boxes
present for it to be filtered out. I'm working on a more general
position-uniformity criterion to help reject junk like this
automatically.
BTW, a ERP monitor upgrade is coming within the next few days: I've
fixed a few minor bugs (e.g. a UT/legal time problem), added some extra
output info, and modified a few cuts. Details posted here soon for those
interested.
Kate.