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

Hi Flemming, Zhenyu,

That should hopefully be the only issue w/ grey cables, damage to connectors if they were not pulled out carefully enough. BTW for installation for IST, we bagged / bubble wrapped the ends. We should do likewise again. Perhaps this wasn't done for the removal, I wasn't involved.

The one worry on the grey cable is if we have a problem with the new bias plan - it is different than the usage of the cables in IST. Hopefully that one cable with bias-related trouble was an isolated incident and not a symptom of something that we've overlooked in this new bias plan. It will be good to run more of these cables soon, if feasible.

   Gerard

---

From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of videbaek <videbaek AT bnl.gov>
Sent: Saturday, February 20, 2021 12:05 PM
To: Ye, Zhenyu <yezhenyu AT uic.edu>
Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] Issues with cables

 

Hi Zhenyu,

I agree completely with what you are suggesting in terms of QA/QC `. As
you probably recall I have brought it up several times.

On grey cables recall we used 72 for IST, and none were thrown out. All
in the basement here at BNL. I think the main concern is the connector
in terms of mechanical damage when they were pulled out and moved.

Flemming


On 2021-02-20 11:44, Ye, Zhenyu wrote:
> Hi all,
>
> We have encountered a few issues with cables (both inner purple and
> outer grey cables) lately during the module production tests. Xu will
> give a detailed report on Monday.
>
> As a reminder, for the production purple cables/T-board assemblies,
> SDU has mounted components on 10 T-boards, 2 of them are at NCKU for
> hybrid fit testing, while the other 8 have been assembled with purple
> cables by the company Mike works with (I will refer them as
> pre-productioin purple cables below). SDU still has 40 more bare
> T-boards waiting for testing results before mounting components and
> sent to BNL for purple cable assembly. So in total I expect that we
> will have 50 production purple cable/T-board assemblies, which I
> thought were sufficient for use in the experiment (36) and as spares.
>
> What worries me is the fraction of working purple cables seems to be
> rather low in prototyping and in pre-production. For example, out of
> the 8 pre-production purple cables, we have tried four at
> UIC/Fermilab, and two of them have a problem (similar rate for
> prototyping). I think we really need to do QC/QA for the purple cable
> assembly, which I understand Mike has a QA plan but has not been
> executed. With this fraction of good quality cables, I am also worried
> that the number of good purple cable/T-board assemblies we end up
> having is insufficient, and I am wondering if we should have more of
> them produced.
>
> The problem with the grey cable that Xu mentioned is so far an
> isolated case, but we need to check the other grey cables we have to
> make sure the ones we use in the experiment do not have a problem.
> Mike, can you please remind me how many grey cables we have? (I think
> we really should make an inventory of all the electronic components,
> including the existing ARC, ARM, PPB, ABC, grey cables,
> purple/T-board, how many we have, where they are and their status)
>
> Best,
> Zhenyu
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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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