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User name hcf
Log entry time 16:27:11 on April 9,2003
Entry number 59002
This entry is a followup to: 15195
keyword=sos dc1 draws dark current
We just noticed that SOS DC1 was drawing current with no beam (since
this morning!). Beam now came on, and we do see an increase in chamber
current, which is normal. However, these chambers should NOT draw a
HV current when there is no beam. See log entries linked to no. 15195
(August, 1999) for more history.
For now, I suggest we keep the DC1 HV low enough that no current is
drawn when beam is off. Gradually, if possible, turn it back up to 1975V.