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[Aschenauer Elke-Caroline <elke AT bnl.gov>]

thanks, cheers elke

On Nov 16, 2021, at 18:07, Visser, Gerard <gvisser AT indiana.edu> wrote:

On the inner hybrid it is here, I think that is the best they could do. Of course it is not in real close thermal contact to the APV chips.

<image.png>

Sincerely,

    Gerard

---

From: videbaek <videbaek AT bnl.gov>
Sent: Tuesday, November 16, 2021 5:53 PM
To: Visser, Gerard <gvisser AT indiana.edu>
Cc: Xu Sun <sunxuhit AT gmail.com>; Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] Increase the cooling flow speed

 

We asked Yi on Monday if he thought the heatsinks could have been 
detached,; he thought not for the inner sector as the cooling tube there 
is sandwiched between the two (inner,outer) peek structures.
Question: where is the sensor situated and in contact with what?

best F

On 2021-11-16 17:46, Visser, Gerard wrote:
> 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 _______________________________________________
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>>>> Star-fst-l AT lists.bnl.gov
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> --
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> senior scientist
> videbaek @ bnl.gov
> Brookhaven National Lab
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> Upton, NY 11973
> 
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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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