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

Dear Xu,

thank you for all the additional info. I agree with you the test at UIC strongly indicates the temperature and the increased pedestal are not correlated.

Cheers elke

On Nov 16, 2021, at 19:57, Xu Sun <sunxuhit AT gmail.com> wrote:

Hi Elke,

Just checked the cosmic test we did at UIC.

The FST module was running without cooling and each run took about 15 hrs.

The temperature was stable at about 37 degrees while the room temperature was about 25 degrees (my guess).

The pedestal was quite stable, at least I didn't recall the pedestal shifts from 1000 to 2000.

This pedestal shifts may not relate to the temperature. 

But I just want to say, if cooling and temperature sensor are working correctly, we should at least have the temperature stable at 27 degrees despite the pedestal level.

Best,

Xu

On Tue, Nov 16, 2021 at 5:56 PM Aschenauer Elke-Caroline <elke AT bnl.gov> wrote:

yes, good question where does the T-sensor sit. 

Also as I suggested can we try to turn of cooling and see what happens to the noise of the good modules, like 1 min after turn on and 20 min, also what is the temp we would see.

I think this test will also tell us if the temp and increased pedestal are correlated at all.

Cheers elke

On Nov 16, 2021, at 17:53, videbaek <videbaek AT bnl.gov> wrote:

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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--
Flemming Videbaek
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videbaek @ bnl.gov
Brookhaven National Lab
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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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