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[Xu Sun <sunxuhit AT gmail.com>]

Hi Gerard,

We did the short test on all the APV chips after we got the module back from 
the technician. And we only move forward after we know there is no short 
between all the possible short region.

Best,

Xu

> On Feb 10, 2021, at 9:45 AM, Visser, Gerard <gvisser AT indiana.edu> wrote:
> 
> hi Xu,
>    I should also mention, if the epoxy overlows on the other side, it will 
> be prevented from shorting only by the 'coverlayer' of the flex circuit 
> hybrid. But AFAIK one isn't supposed to rely on the coverlayer as 
> insulation. So that would be a non-ideal situation too, that you should 
> please watch out for. Maybe it works fine in practice if it overflows that 
> part, but I am not so sure. I'd defer to judgement of experts there of 
> course.
> 
>    Gerard
> 
> 
> From: Visser, Gerard <gvisser AT indiana.edu>
> Sent: Wednesday, February 10, 2021 10:34 AM
> To: Star-fst L <star-fst-l AT lists.bnl.gov>
> Subject: Re: [Star-fst-l] FST slides from Monday
>  
> hi Xu, Flemming,
>   Interesting.
>    I feel I must point out, I asked (several times) that we should ask 
> Fermilab Sidet people to review the hybrid layout files, specifically 
> because these other copper areas in the layout looked to me too close to 
> the die attach pad. I believe I was told that the layout was examined and 
> it was fine. Clearly, that's not the case. Oh well.
>    Reworking every hybrid in this manner is not zero risk.
> 
>    Gerard
> 
> p.s. On slide 6 - extra noise in cooling test - the cooling tube was I hope 
> grounded to T-board according to plan. Right? (If not, there is risk of 
> permanent damage, not only of higher noise.)
> 
> 
> From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of videbaek 
> <videbaek AT bnl.gov>
> Sent: Wednesday, February 10, 2021 9:15 AM
> To: Star-fst L <star-fst-l AT lists.bnl.gov>
> Subject: [Star-fst-l] FST slides from Monday
>  
> Hi Xu,
> 
> Are your slides from Monday's meeting available? I do not see them on 
> the meeting page.
> 
> best Flemming
> 
> 
> -- 
> 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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