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Log entry time 09:18:04 on January 22, 2008
Entry number 149225
keyword=Target: Target problems
Over the past hour, we have noticed that the PID loop doesn't seems to
keep the target temp. at 19K. So I reduced the JT valve, and then it
seemed to keep the temp. near 19K, as long as the beam didn't trip off.
Then we noticedd that turneing Beam Compensation off, and then the
PID loop works fine! This is reproducible. Tried swithcing to the other
BCM: problem persisted. Tried rebooting (twice), but haven't got
stable beam yet to try if Beam Compensation is working right or not.
However, we now (after both re-boots) are gettings the crazy value of
490 K on the Hesupply termperature. HeHesuply-1R (15 K supply). SO we
always have a red alarm on this. But it must be a false reading, or
the target wouldn't be cold, I suppose. For now, will leave as is.