[d2n-analysis-talk] bbps1 question

[Brad Sawatzky]

On Tue, 19 Oct 2010, posik at jlab.org wrote:

> I have been doing a finer skim of the BigBite production list and
> found about 30 runs (1858-1882) where bbps1:2002 S10, L10.0 was turned
> on, but should have been turned off. I was wondering what the bbps1
> refers to and if it being switched on would cause those 30 or so runs
> to be no good?

bbps1:2002 was a BigBite PortServer that controlled one of our high
voltage crates.  Something ON when it should have been OFF is usually
not a problem.  (Sometimes we turned off some HV channels to help
protect the system during beam tuning, etc.  If we forgot, the system
would typically just trip -- no big deal.)

If it was OFF and should have been ON, then yes, that could be a
problem -- it all depends was being powered by Slot 10, channel 0
in that crate.

All the HVs get written to the Halog Start of Run entries.  I looked
through a random sample in the range you list and don't see anything we
would care about that is turned off.

It's also weird that the comment only mentions is a single channel.
Fatiha turned this on, presumably in response to this auto-logged
warning:
  http://www.jlab.org/~adaq/halog/html/0902_archive/090227065935.html
  http://www.jlab.org/~adaq/halog/html/0902_archive/090227071752.html
Then Diana turned it back off
  http://www.jlab.org/~adaq/halog/html/0902_archive/090227213718.html

I think the wire chamber warning was a spurious comm problem (HVs look
good) and had nothing to do with the HV channel that Fatiha turned on.
It may be that nothing was plugged into that channel at all...

Is there any indication the runs are no good (missing channels, etc)?

-- Brad

-- 
Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager: brads-page at jlab.org
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  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov