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["Visser, Gerard" <gvisser AT indiana.edu>]

There is certainly a possibility for a T sensor to break.

I think if the T sensor reads high and the pedestals shift as things warm up -- can we compare 1 min after power on to 30 min after power on, comparing for both this module and a typical good one - then it is probably real temperature change.

I didn't remember the flow is in series between modules. So the coolant is surely not the issue.

But those little aluminum blocks could have become decoupled from the cooling tube, perhaps?

    Gerard

---

From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of videbaek <videbaek AT bnl.gov>
Sent: Tuesday, November 16, 2021 5:41 PM
To: Xu Sun <sunxuhit AT gmail.com>
Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] Increase the cooling flow speed

 

Hi

As I said Monday I have yet to see an explanation that stops the flow in
the first part of a cooling loop and that the last part has sufficient
cooling - this would require back flow.
I wonder more if something electronics went wrong with the temp readout,
and could it have affected the output levels though unlikely.

-F




On 2021-11-16 17:04, Xu Sun wrote:
> Hi Elke,
>
> The module 3-11 is the first module in that cooling line.
> And the cooling supply will go to the outer section first then the
> inner section of the module 3-11.
>
> I agree that the temperature issue might not be caused by the cooling
> flow, but we would still like to try one more time.
>
> Best,
>
> Xu
>
> On Tue, Nov 16, 2021 at 4:53 PM Aschenauer Elke-Caroline
> <elke AT bnl.gov> wrote:
>
>> Dear Xu,
>>
>> let me ask a question today at the meeting I asked you is it the
>> module the first or the last one in the cooling chain and you
>> answered the first one.
>> So if really the cooling is causing the temperature issue. Maybe I
>> misunderstood your answer today, sorry.
>> I’m not against increasing the flow, but I’m just wondering.
>>
>> Cheers elke
>>
>>> On Nov 16, 2021, at 16:49, Xu Sun <sunxuhit AT gmail.com> wrote:
>>>
>>> Hi All,
>>>
>>> We are planning to increase the cooling flow speed by changing the
>>> pump setting from 1100 RPM to 1500 RPM tomorrow.
>>> This change will increase the flow rate by 20-30% and the pressure
>>> is still well below the limit of the soft tube.
>>> Christian will help us to do this.
>>>
>>> The flow speed will be changed back to 1100 RPM after we finish
>>> the test, since the current value is sufficient enough to cool
>>> down the whole FST.
>>> Hopefully this can fix the temperature issue.
>>>
>>> We will keep you posted.
>>>
>>> Best,
>>>
>>> Xu _______________________________________________
>>> Star-fst-l mailing list
>>> Star-fst-l AT lists.bnl.gov
>>> https://lists.bnl.gov/mailman/listinfo/star-fst-l
>>
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Flemming Videbaek
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