Star-fst-l mailing list

[videbaek <videbaek AT bnl.gov>]

Hi Xu

thanks for the info. I would not think this could be an external noise 
source
since then I would have expected it to show up in more that just two 
spatially separated
modules. Are the two sets of cable for -11 and 1-7 close to each other?

Flemming



On 2021-08-18 14:43, Xu Sun wrote:
> Hi Gerard,
>
> > Nothing was touched on any FST cable or support connections between
> when it was noisy and when it was not? That would be comforting to
> hear.
> We didn't do anything. I was just trying to get some baseline before
> we pulled the detector then I saw the noise went away.
> CAD put a few tubes on top of one bundle of gray cable but I doubt it
> will do anything.
>
> > Will it be possible to take regularly some biased/dark runs over
> next few days to watch for changes? That would be optimal I think.
> That's what I am going to do.
>
> Best,
>
> Xu
>
> On Wed, Aug 18, 2021 at 2:37 PM Visser, Gerard <gvisser AT indiana.edu>
> wrote:
>
> > Hopefully it is something external.
> > Nothing was touched on any FST cable or support connections between
> > when it was noisy and when it was not? That would be comforting to
> > hear.
> >
> > I think it may be too soon to rule out an intermittently bad
> > connection in the FST.
> >
> > Will it be possible to take regularly some biased/dark runs over
> > next few days to watch for changes? That would be optimal I think.
> >
> > Gerard
> >
> > -------------------------
> >
> > From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of Xu
> > Sun <sunxuhit AT gmail.com>
> > Sent: Wednesday, August 18, 2021 2:31 PM
> > To: Aschenauer Elke-Caroline <elke AT bnl.gov>
> > Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
> > Subject: Re: [Star-fst-l] status
> >
> > Hi Elke,
> >
> > Thanks for asking. I am about to send the email.
> > As you said, the noise just went away before we did anything.
> > The good thing is the detector is working properly but we don't know
> > why it is gone.
> >
> > It turns out both the module and purple cable are good and there
> > seems to be an unknown source of noise around yesterday.
> > We postponed the detector pulling and are trying to identify the
> > possible noise source, but no luck so far.
> > If we could find the noise source, we will try to decouple it from
> > our FST.
> >
> > Best,
> >
> > Xu
> >
> > On Wed, Aug 18, 2021 at 2:24 PM Aschenauer Elke-Caroline
> > <elke AT bnl.gov> wrote:
> >
> > > Dear All,
> > >
> > > I just did hear your noise is gone, without doing anything.
> > > Can somebody please elaborate a bit on it.
> > >
> > > Thanks elke
> > >
> > > _Note: Please do not feel obligated to respond to this message
> > > outside of your work hours._
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--
Flemming Videbaek
senior scientist
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596