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[videbaek <videbaek AT bnl.gov>]

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