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

Thanks for the inputs. I did not expect so many emails. Let me make it simple

Obviously we have a choice, we can start using the opened one now or in the summer. 

Both may turn out to be a fine choice but between the two, the latter is a better option in 

my opinion. This has nothing to do with whether or not I believe the limit or measurements, 

but because we don’t want to introduce any uncertainty with the run that the new detector 

is built for only a few weeks away and there is no harm to let the opened drum sit for 

another 6 months after it has already been like this for the past 6 years. Let’s use with the 

best NOVEC we have for the time being and move to the opened one later. 

Best,

Zhenyu

On Oct 20, 2021, at 4:55 PM, Visser, Gerard <gvisser AT indiana.edu> wrote:

Well, all I can say is that I think Zhenyu's point is: use what we have always recently used until we get a bit of operational experience, since there is no real drawback to doing so. (Unless I missed something?) Deferring the open drum a few months is not going to make it much worse, if it is stored in same condition as it has been stored in. The assay said the storage had no discernable effect at all, which is very good news, right?

Anyway, I don't think my opinion on this is very important, please decide by the best consensus. I am not really expecting there is any problem and I don't have any real objection to the plan.

    Gerard

---

From: Aschenauer Elke-Caroline
Sent: Wednesday, October 20, 2021 5:30 PM
To: Visser, Gerard
Cc: Aschenauer Elke-Caroline; Ye, Zhenyu; Sharma Rahul; Star-fst L
Subject: Re: [Star-fst-l] NOVEC from the opened drum is good to use

Gerard,

now I’m getting really confused TPC and the leaking fluid, we used the same fluid before and it was deemed safe.

Actually NOVEC if it leaks evaporates fast that’s why people use it.

I’m fine to wait to use the open liquid until we are sure the cooling system is working fine, but we have not for month not seen an issue.

Cheers elke

On Oct 20, 2021, at 16:28, Visser, Gerard <gvisser AT indiana.edu> wrote:

FWIW I think Zhenyu's plan is good. It has to be fine to use, but still, wait for a bit of operational experience before using it, why not? In case we develop leaks we will want to have the utmost confidence that the leaking fluid is safe for the TPC.

      Gerard

---

From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of Ye, Zhenyu <yezhenyu AT uic.edu>
Sent: Wednesday, October 20, 2021 4:20 PM
To: Sharma, Rahul <rsharma AT bnl.gov>
Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] NOVEC from the opened drum is good to use

 

The reason that I propose to use the new barrels in Run22 is to avoid having any potential problem in the middle of the run.

The opened drum has been in its current status in 6 years so it will not make a big difference to let it sit for another 6 months (let me know if you think otherwise). We will have plenty of time to test use it in the summer and continue using it in Run23 and beyond if no problem is found.

Zhenyu

On Oct 20, 2021, at 3:13 PM, Sharma, Rahul <rsharma AT bnl.gov> wrote:

I agree with Elke

 

• Rahul

 

From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> On Behalf Of Aschenauer Elke-Caroline
Sent: Wednesday, October 20, 2021 4:12 PM
To: Ye, Zhenyu <yezhenyu AT uic.edu>
Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] NOVEC from the opened drum is good to use

 

sorry, maybe I’m on the wrong track, but would it not be better to use the open NOVEC as fast as possible to avoid that it gets water in it.

 

Cheers elke

 

On Oct 20, 2021, at 15:59, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:

 

Thank you for the efforts, Prithwish.

 

I would propose to continue using the small barrels of new NOVEC for run 22, and use the NOVEC from the opened drum from PHENIX towards the end of the run or in the summer. 

 

Zhenyu 

On Oct 20, 2021, at 2:34 PM, Tribedy, Prithwish <ptribedy AT bnl.gov> wrote:

 

Hello Everyone,

 Good news!! The report from the chemistry lab has arrived. The water contamination in the remaining NOVEC liquid from the opened drum is well below 90 ppm (as required for safe operations according to the 3M experts). 

 

We provided the chemists with three samples: 1) from the top layer of the opened drum (Sample A TOP), 2) from the bottom of the opened drum (Sample B BOT) and, 3) from a newly opened small NOVEC container (Sample C SML). All the samples have been checked twice and found to have water contaminations at the level of 41-44 ppm. This level of contamination is permissible for safe operations as per our previous communication with the 3M experts. 

 

So, we can go ahead and use the NOVEC from the opened drum for the upcoming run. 

 

We're grateful to our colleagues from the Neutrino and Nuclear Chemistry group of the Chemistry Department at BNL. 

 

Regards,

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

 

Begin forwarded message:

 

From: "Gokhale, Sasmit" <sgokhale AT bnl.gov>

Subject: Water content analysis of C4F9OC2H5 coolant liquid

Date: October 20, 2021 at 2:28:28 PM EDT

To: Prithwish Tribedy <ptribedy AT icloud.com>, "Yeh, Minfang" <yeh AT bnl.gov>

Cc: "Hu, Yu" <yuhu AT bnl.gov>

 

Hello Prithwish,

 

I hope you are doing well. I have finished analyzing the three samples that you gave us. I ran two Karl Fischer titration measurements for each of the three bottles that you provided i.e. one sample was collected from the top and bottom of the each bottle. Below are the results:

 

Sample A BOT:

Measurement 1: water content = 43.98 ppm

Measurement 2: water content = 44.89 ppm

 

Sample B TOP:

Measurement 1: water content = 42.22 ppm

Measurement 2: water content = 43.23 ppm

 

Sample C SML:

Measurement 1: water content = 41.98 ppm

Measurement 2: water content = 41.79 ppm

 

To check the accuracy, I also ran a sample of one of our organic solvents which should have a water content between 60 to 80 ppm and the measured water quantity for that liquid was 63.18 ppm. So it seems the measured values can be trusted.

 

Please let me know if you have any further questions.

 

Best Regards,

Sasmit

 

 

Sasmit Gokhale

Research Associate

Brookhaven National Lab 

Building 555

Upton, NY 11973

Phone: 631-344-4992

Email: sgokhale AT bnl.gov

 

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