sPHENIX MAPS tracker discussion

[Ming Liu <ming AT bnl.gov>]

Hi Ed and Grazyna,
Yes, it is a good idea to have a clean tent with sufficient space for the 
half-detector, the overall length is <~ 2.5m, not super large.  
We could bring it up at next sPHENIX planning meeting? 
 
Cheers,
Ming 
-----

 
Dr. Ming Xiong Liu
P-3, MS H846
Physics Division
 
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On 4/27/21, 4:35 PM, "sPHENIX-MAPS-l on behalf of Grazyna Odyniec" 
<sphenix-maps-l-bounces AT lists.bnl.gov on behalf of g_odyniec AT lbl.gov> wrote:

    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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    >> >
    >
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