Star-fst-l mailing list

["Ye, Zhenyu" <yezhenyu AT uic.edu>]

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