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  • From: Xu Sun <sunxuhit AT gmail.com>
  • To: videbaek <videbaek AT bnl.gov>
  • Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
  • Subject: Re: [Star-fst-l] status
  • Date: Wed, 18 Aug 2021 19:24:50 -0400

Hi Flemming,

 Are the two sets of cable for -11 and 1-7 close to each other?
The 1-7 is connected to PPB A-1 and 1-11 is connected to PPB B-5. The gray cables are in two bundles but they might to tangle together around MPOD side.

Best,

Xu

On Wed, Aug 18, 2021 at 2:49 PM videbaek <videbaek AT bnl.gov> wrote:
Hi Xu

thanks for the info. I would not think this could be an external noise
source
since then I would have expected it to show up in more that just two
spatially separated
modules. Are the two sets of cable for -11 and 1-7 close to each other?

Flemming



On 2021-08-18 14:43, Xu Sun wrote:
> Hi Gerard,
>
>> Nothing was touched on any FST cable or support connections between
> when it was noisy and when it was not? That would be comforting to
> hear.
> We didn't do anything. I was just trying to get some baseline before
> we pulled the detector then I saw the noise went away.
> CAD put a few tubes on top of one bundle of gray cable but I doubt it
> will do anything.
>
>> Will it be possible to take regularly some biased/dark runs over
> next few days to watch for changes? That would be optimal I think.
> That's what I am going to do.
>
> Best,
>
> Xu
>
> On Wed, Aug 18, 2021 at 2:37 PM Visser, Gerard <gvisser AT indiana.edu>
> wrote:
>
>> Hopefully it is something external.
>> Nothing was touched on any FST cable or support connections between
>> when it was noisy and when it was not? That would be comforting to
>> hear.
>>
>> I think it may be too soon to rule out an intermittently bad
>> connection in the FST.
>>
>> Will it be possible to take regularly some biased/dark runs over
>> next few days to watch for changes? That would be optimal I think.
>>
>> Gerard
>>
>> -------------------------
>>
>> From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of Xu
>> Sun <sunxuhit AT gmail.com>
>> Sent: Wednesday, August 18, 2021 2:31 PM
>> To: Aschenauer Elke-Caroline <elke AT bnl.gov>
>> Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
>> Subject: Re: [Star-fst-l] status
>>
>> Hi Elke,
>>
>> Thanks for asking. I am about to send the email.
>> As you said, the noise just went away before we did anything.
>> The good thing is the detector is working properly but we don't know
>> why it is gone.
>>
>> It turns out both the module and purple cable are good and there
>> seems to be an unknown source of noise around yesterday.
>> We postponed the detector pulling and are trying to identify the
>> possible noise source, but no luck so far.
>> If we could find the noise source, we will try to decouple it from
>> our FST.
>>
>> Best,
>>
>> Xu
>>
>> On Wed, Aug 18, 2021 at 2:24 PM Aschenauer Elke-Caroline
>> <elke AT bnl.gov> wrote:
>>
>>> Dear All,
>>>
>>> I just did hear your noise is gone, without doing anything.
>>> Can somebody please elaborate a bit on it.
>>>
>>> Thanks elke
>>>
>>> _Note: Please do not feel obligated to respond to this message
>>> outside of your work hours._
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>>> ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-
>>>
>>> )    `\                                                      +
>>> /    '. |        Elke-Caroline Aschenauer  (she/her/hers)      =
>>> |       `,                                                      -
>>>
>>> \,_  `-/        Brookhaven National Lab
>>> +
>>> ,&&&&&V         Physics Dept.,            25 Corona Road
>>> =
>>> ,&&&&&&&&:       Bldg. 510 /2-195          Rocky Point, NY,
>>> -
>>> ,&&&&&&&&&&;      20 Pennsylvania Avenue                 11778
>>> +
>>> |  |&&&&&&&;\     Upton, NY 11973
>>> =
>>> |  |       :_) _  Tel.:  001-631-344-4769   Tel.:
>>> +1-631-569-4290    -
>>> |  |       ;--' |                           Cell-USA:
>>> +1-757-2565224   +
>>> '--'   `-.--.   |                           Cell-Europe:
>>> +49152220025211 =
>>> \_    |  |—‘
>>> -
>>>
>>> `-._\__/     Mail: elke AT bnl.gov        elke.caroline AT me.com
>>> +
>>>
>>> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
>>>
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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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