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

So, it looks like really heating up, I think. Do you agree?

BTW I do not think we will damage any hardware at the T sensor temperature of 37 degrees. Probably the APV temperature is not that much higher, I guess less than 50 deg C. It probably does not work real well but it may still be OK to consider just using it?

If you have enough resolution on the bias current readout, you should see the bias current rising as the sensors warm up too presumably.

     Gerard

---

From: Xu Sun <sunxuhit AT gmail.com>
Sent: Tuesday, November 16, 2021 6:42 PM
To: Visser, Gerard <gvisser AT indiana.edu>
Cc: videbaek <videbaek AT bnl.gov>; Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] Increase the cooling flow speed

 

Hi All,

I forgot to mention an important piece of information.

We had done the readout test with module 3-11 and readout the temperature sensor this morning.

The module 3-11 was not in the readout since last night and it should be at room temperature.

Firstly, we took a pedestal run with FST only with 1000 events (typically takes about 1 mins to run). The temperature readout was ~28 degrees.

Right after the pedestal, we did a cosmic run and the temperature readout was ~ 35 degrees (typical cosmic run is about 30 mins).

In the next cosmic run, the temperature was 37 degrees and stayed 37 degrees before I turned off the module 3-11.

The temperature readout for the outer section remains about 25 degrees through the whole test.

A plot of the temperature changes could be found in the attachment.

Best,

Xu

On Tue, Nov 16, 2021 at 5:46 PM Visser, Gerard <gvisser AT indiana.edu> 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 _______________________________________________
>>> 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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