[Sbs_gems] [EXTERNAL] Problems with J0 Mid

[Ezekiel Wertz]

Hi Evaristo,

Thanks for that information. I expect that it would be extremely difficult
to determine where shorted sectors are on these modules while the detector
is in BigBite.We would most likely need to remove J0 from BigBite. We will
have to discuss this all further

Ezekiel

On Fri, Dec 3, 2021 at 5:05 AM Evaristo Cisbani <
evaristo.cisbani at roma1.infn.it> wrote:

> Dear Anu,
>
> also for the bottom J0 one should try to ramp the HV at 500 V and 1000 V
> to see
> if the HV current exceed the maximum allowed current (13.5 and 26 uA).
>
> Thanks
> Evaristo
>
> On Fri, 3 Dec 2021 03:32:29 -0500 Anuruddha Rathnayake
> <adr4zs at virginia.edu> wrote:
>
> > Hi All,
> >
> > This is the 50 K replay of the run 12496. This run has been started when
> > the issue is present but when it was still unknown. So the HV has been on
> > for the J0 middle module. https://logbooks.jlab.org/entry/3955367
> >
> > I would also like to bring everybody's attention about the INFN J0 bottom
> > module's current instability issue that started to develop around 2 AM
> > today. https://logbooks.jlab.org/entry/3955398
> > I have instructed the shift crew to turn the module off until an INFN GEM
> > expert contacts them.
> >
> > Best,
> > Anu
> >
> >
> > On Thu, Dec 2, 2021 at 10:12 PM Ezekiel Wertz <ewertz at email.wm.edu>
> wrote:
> >
> > > Hi Kondo,
> > >
> > > Thanks for the quick feedback. We will have to discuss the path
> forward,
> > > but it is good to know that the problem is identifiable.
> > >
> > > Zeke
> > >
> > > On Thu, Dec 2, 2021 at 10:10 PM Gnanvo, Kondo (kg6cq) <
> kg6cq at virginia.edu>
> > > wrote:
> > >
> > >> Hi Zeke,
> > >> This crosses all the boxes of a shorted sector
> > >>
> > >> A gas window collapsed would not change the current.
> > >>
> > >> Best regards
> > >> Kondo
> > >> ------------------------------
> > >> *From:* Sbs_gems <sbs_gems-bounces at jlab.org> on behalf of Ezekiel
> Wertz <
> > >> ewertz at email.wm.edu>
> > >> *Sent:* Thursday, December 2, 2021 9:52 PM
> > >> *To:* Sbs_gems at jlab.org <sbs_gems at jlab.org>
> > >> *Subject:* [Sbs_gems] [EXTERNAL] Problems with J0 Mid
> > >>
> > >> Hi Folks,
> > >>
> > >> I was alerted by the shift crew to a problem with J0 Middle. At the
> > >> moment we are not entirely sure what has occurred, but the HV
> demonstrated
> > >> some problems and the efficiency of the module has become greatly
> reduced.
> > >> See the following log entries.
> > >>
> > >> https://logbooks.jlab.org/entry/3955216
> > >> https://logbooks.jlab.org/entry/3955221
> > >> https://logbooks.jlab.org/entry/3955220
> > >>
> > >> Also see the 50k replay plot for J0 mid on page 24
> > >>
> > >>
> https://logbooks.jlab.org/files/2021/12/3955238/summaryPlots_12496_bb_gem_for_shiftcrew.pdf
> > >>
> > >> Currently we suspect either a foil collapse or new shorted sectors in
> > >> this module. But we are uncertain of the actual cause which is why I
> am
> > >> contacting all of you. I have instructed shift crew to turn off J0
> middle
> > >> HV until further notice
> > >>
> > >>
> > >> Ezekiel
> > >>
> > > _______________________________________________
> > > Sbs_gems mailing list
> > > Sbs_gems at jlab.org
> > > https://mailman.jlab.org/mailman/listinfo/sbs_gems
> > >
>
>
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