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[videbaek <videbaek AT bnl.gov>]

Hi Zhenyu

Sounds like a good approach.
For the cooling tubes, are there any way we can visually inspect them 
w/o pulling out
( camera + light). The possible concern is the flowing novec may remove 
some material, but as all
parts apart from the tubes is grounded it should be good.
Just for your info; I will be out of town Saturday-Friday (~6 days).

best F





On 2022-02-23 16:14, Ye, Zhenyu wrote:
> Hi Flemming,
>
> We should discuss this next Monday.
>
> If I look at slide 3
> https://drupal.star.bnl.gov/STAR/system/files/FstHardware_STARColl_Feb2022.pdf
> It is possible that HV current fluctuation on 1-12 can be fixed by
> replacing the Grey cable. We will replace the PPB for 3-11. Thus, the
> maximum gain is 1-6 inner (need to understand its efficiency) and 2-2
> outer (basically useless). I would call this a small improvement, and
> certainly I would not advocate to take the detector out only for this
> due to the huge risk.
>
> However, we may want to check the soft cooling tubes. I asked Yu to
> place some cooling tubes in NOVEC before the run started. I would take
> a look at those first. I would also check the cooling rack, check for
> leaks and reassess the leak rate after servicing it before deciding
> whether to not to take it out.
>
> Best,
> Zhenyu
>
> > On Feb 23, 2022, at 2:23 PM, videbaek <videbaek AT bnl.gov> wrote:
> >
> > I assume you have seen Rahul's call for shutdown work.
> >
> > I would assume that we would try inversigate and fix the trouble 
> > modules, understand the leakage (checking the tubes). So this would 
> > imply taking it down. As the shutdown is very long I would assume this 
> > is not right after the end of run, but at some time convenient for 
> > particular you.
> > What is your thought on this?
> >
> > best Flemming
> >
> >
> > --
> > 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
>
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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