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[Xu Sun <sunxuhit AT gmail.com>]

Hi Flemming,

Bob and Rahul told us the novec will eat up the materials and the leaking rate will increase with time.

Best,

Xu

On Thu, May 27, 2021 at 4:48 PM videbaek <videbaek AT bnl.gov> wrote:

Hi

Did Rob indicate the rationale for exchange every year. Possible Rad
damage ?
It would be good to know.

best F.


On 2021-05-27 16:37, Zhenyu Ye wrote:
> This is good news, indeed.
>
> If it works, it would solve our problem for the upcoming Run.
> But it also brings a new potential issue, that we need to replace the
> cooling tubes every year.
> If we can avoid it, it will be the best.
>
> Zhenyu
>
>> On May 27, 2021, at 2:33 PM, Tribedy, Prithwish <ptribedy AT bnl.gov>
>> wrote:
>>
>> Hello everyone,
>> We have good news to share with you. With a new kind of tube that was
>> previously used by Phenix, we might have a solution to our leak
>> problem. We need to do more tests, but I think this is a good
>> progress.
>>
>> Remember we had the following issues:
>>      • The hard tubes were very stiff, bending radius was large but had
>> less leak.
>>      • The soft tubes had major leaks between layers.
>> A solution came after Bob/Rahul contacted Robert Pisani from Phenix.
>> From them we got this third type: Tygon 2001 plasticizer free" tubes.
>>
>> With our pressurized air setup, we see NO LEAKS. No more bubbles with
>> soap.
>>
>> Also, it's much cheaper. It costs like $2.5 c per ft (compared to
>> $20-80 for the previous soft tube we were using).
>> According to PHENIX experts, they should be replaced once every year
>> -- I think that is feasible.
>>
>> So, we'll get 25 ft of these tubes tomorrow and this way we have the
>> full weekend to do the testing.
>> If things look good in next couple of days and no leaks are found‚ WE
>> MIGHT HAVE A SOLUTION.
>>
>> We will keep you updated.
>> Best,
>> Yu, Xu and Prithwish
>>
>>
>> Prithwish Tribedy
>> Physics Department, Brookhaven National Laboratory
>> Upton, NY 11973, USA
>> Phone: 631-344-8904, 631-344-3853
>> E-mail: ptribedy AT bnl.gov
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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
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