sPHENIX MAPS tracker discussion

[Grazyna Odyniec <g_odyniec AT lbl.gov>]

Hi Ming and Ed,

When we build STAR vertex detector, HFT, (also built in LBNL and 
transported to BNL), we have had a small "clean room" tent set in the 
assembly hall area of STAR. It was meant for the same. And I think it 
worked well. There was enough room, that even when STAR detector was 
rolled back to the assembly hall, this clean tent was not disturbed.

Can we have a similar arrangement in sPHENIX assembly area ?

best, Grazyna


On 4/27/21 2:38 PM, Edward O'Brien wrote:
>     Hi Ming,
>      You are bringing up an important issue. We would have to identify
>     the space at BNL to do this kind of rework. My best knowledge is that
>     there aren't any unoccupied clean rooms at BNL. If we think that
>     we might need one for the MVTX we need to do a little planning
>     ahead of time. Thanks.
>
>      Ed
>
> On 4/23/21 4:53 PM, Liu, Ming Xiong wrote:
> > Hi Grazyna, Camelia, Yuan, Jo and all,
> >
> > One topic that I didn’t get time to bring up for discussion at 
> > today's meeting, and like to ask you all to think about:
> >   - what if we need to re-work on the assembled detector at BNL? Will 
> > we be ready?
> >
> >  From ALICE experience (see the following email), ITS has to rework 
> > on the detector assembly several times during the surface 
> > commissioning and also at installation.
> > Well they have labs at CERN so it was not a big challenge, it could 
> > be different for MVTX.
> >
> > My concern is that whether we can do the similar work  at BNL - open 
> > up the detector and replaced faulty components, could be cables or 
> > sensors etc.
> >
> > Our current plan is to ship the fully tested MVTX half-detectors to 
> > BNL early 2022, and we will have several months of time doing 
> > pre-installation commissioning, and hope nothing bad happens to the 
> > MVTX detectors. BUT, we need to be prepared for the worst, so my 
> > question is:
> >       - should we also ship all the assembly fixtures to BNL and 
> > setup a clean tent so that we can rework on the half-detectors if 
> > needed? Or we send the detector back to LBNL  to fix?
> >     - do the current assembly fixtures and procedure allow us to do 
> > such operation at BNL?
> >
> > Cheers,
> > Ming
> >   -----
> >
> >   Dr. Ming Xiong Liu
> > P-3, MS H846
> > Physics Division
> >   Office: 505.667.7125
> > Mobile: 505.412.7396
> > Los Alamos National Laboratory
> > lanl.gov
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