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

Hi Flemming,

Yes I believe we can visually inspect the soft cooling tubes, at least the 
parts after the outermost disk, w/o moving the detector at all.
I think there is little risk to move the detector out w/o passing the TPC 
surface.
The risk will increase but probably still tolerable (?) if we pull the 
detector completely out of the TPC cone.
Unless it is deemed necessary, I would not consider bringing it down to the 
clean room.

Zhenyu

> On Feb 23, 2022, at 4:31 PM, videbaek <videbaek AT bnl.gov> wrote:
> 
> 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://urldefense.com/v3/__https://nam04.safelinks.protection.outlook.com/?url=https*3A*2F*2Fdrupal.star.bnl.gov*2FSTAR*2Fsystem*2Ffiles*2FFstHardware_STARColl_Feb2022.pdf&amp;data=04*7C01*7Cyezhenyu*40uic.edu*7C85b0de4618234468dca808d9f71c3020*7Ce202cd477a564baa99e3e3b71a7c77dd*7C0*7C0*7C637812523265774849*7CUnknown*7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0*3D*7C3000&amp;sdata=5uj71xIEyBRTMLn2qDDIZzahA27xKBglivCDbMEmI2M*3D&amp;reserved=0__;JSUlJSUlJSUlJSUlJSUlJSUlJSU!!P4SdNyxKAPE!TEvVeAOEQo6Uv6ZM1O4saVRJHPV-Mpld8MdC3lxojQ3jkfYRIopFIwoILKrPSESL6rAIBNw$
>>  
>> 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