[Primexd] FCAL bad channel status

[Colin Gleason]

I will make the replacements in an hour or so. If you take LED data and see
any suspicious channels, let me know and I can replace them anytime during
the access this week.

Do you know of any other suspicious channels? I got my list by checking the
scalers a week or two ago. I will need to check signals on the scope to
make sure they're bad.

On Wed, Nov 28, 2018 at 11:48 AM Alexander Somov <somov at jlab.org> wrote:

>
> Thanks a lot Colin for the update (and quick response). It would
> be great if can replace these bases during this week (the hall
> will be closed later today and will be re-opened tomorrow).
>
> We can take LED data today and check the status.
>
> Cheers,
>         Sasha
>
>
> On Wed, 28 Nov 2018, Colin Gleason wrote:
>
> > Hi Sasha,
> >
> > I suspect there are around 5-10 bad/suspicious FCAL channels. I know of 2
> > that are dead and 3 that are just showing noise. I will replace these
> after
> > lunch. Someone either forgot to turn on the FCAL communications yesterday
> > or has turned it off today, so I do not know all channels. The ones I
> know
> > of are in (X,Y):
> > bad signal:
> > 16 8
> > 26 0
> > 27 -6HV:
> > -8 28
> > 14 21
> >
> > There are likely a few bases whose HV is below their set point. We
> usually
> > keep these in the FCAL until they die, or, if we have enough spares
> > available, will swap them out.
> >
> > Currently we have 16 spares ready to go in, with more ready to be
> repaired
> > by Chris and Nick. The base failure rate had dropped to less than 2 per
> > week by the end of the run, so we should be able to manage replacements
> > through the rest of the Fall run. I think Chris and Nick have been busy
> > with installation, but once that is complete we can get them to repair
> more
> > bases for the spring.
> >
> > -Colin
> >
> > On Wed, Nov 28, 2018 at 11:25 AM Alexander Somov <somov at jlab.org> wrote:
> >
> >>
> >>
> >> Hi Colin,
> >>
> >> Could you update us on the status of bad (suspicious)
> >> channels in the FCAL.
> >>
> >> Could you send a list of bad/suspicious channels
> >>
> >> Did you have a chance to replace bases during
> >> this shut down ? How many spare bases do you have ?
> >>
> >> We'll need to take LED data when you turn HVs on.
> >>
> >> Thanks,
> >>         Sasha
> >>
> >>
> >
> > --
> > Colin Gleason
> > Postdoctoral Fellow
> > Indiana University
> > Department of Physics
> >
>


-- 
Colin Gleason
Postdoctoral Fellow
Indiana University
Department of Physics
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