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["Ye, Zhenyu" <yezhenyu AT uic.edu>]

Hi Flemming,

Thanks for the reply. It is good to know we have all the 72 grey cables from 
IST.

Besides QA/QC, there are two other points I would like to discuss. One is 
whether we should make more T-board/purple cable assemblies. The second is 
the inventory, which I have been advocating for a few times.

Zhenyu 



> On Feb 20, 2021, at 11:05 AM, videbaek <videbaek AT bnl.gov> wrote:
> 
> 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