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["Capotosto, Michael" <capotosto AT bnl.gov>]

Zhenyu, 

Sorry for the late reply. I don't think the T-Board/cable should be much of 
an issue - We were able to squeeze the cable down where it soldered to the 
boards to quite a small height with the V2.1 test stand boards. The bulk of 
the cables where they solder to the board will be considerably less for the 
V3.0 T-Boards, as we omitted the heat shrink labels. The cable itself is also 
going to be a smaller diameter - It will be a single molded "Purple" cable - 
compared to the bundle of 3 cables used for the V2.1 test stand cables. 

I've attached a picture of the V2.1 test stand cable and board assembly that 
Steve distributed some time ago for reference. The height being measured will 
probably be about the same, however the bundle covered by the white sleeve 
will be significantly smaller - from 0.645" (~16.4mm) (pictured) to ~0.415" 
(~10.5mm).

We were able to put a tight bend in the wires by removing a little bit of 
extra jacket and shield from the cables as seen in the picture, we can do the 
same if need be for the production units. I don't think an extra 1" (25.4mm) 
of shield will have much affect on signal integrity, but if we do find it 
necessary I'd like to hear Gerard's thoughts. 

--Mike



-----Original Message-----
From: Ye, Zhenyu <yezhenyu AT uic.edu> 
Sent: Friday, December 20, 2019 12:39 PM
To: Han-Sheng Li <acidhf AT gmail.com>; Capotosto, Michael <capotosto AT bnl.gov>
Cc: star-fst-l AT lists.bnl.gov
Subject: Question on T-board/Inner Signal Cable

Hi Mike,

Xu and I are trying to come to a conceptual design for a structure holding a 
FST module in the cosmic and laser test stands (see 
https://drupal.star.bnl.gov/STAR/system/files/FSTTestStand_UIC.pdf )

We are thinking of using the holding box that Han-Sheng and Yi are designing 
(shown on slide 6 
https://drupal.star.bnl.gov/STAR/system/files/YiYang_FST_MS_20191219.pdf )

But we are not sure if the T-board/Inner Signal Cable would be in the way 
when we try to connect it to the module in the box. Can you please tell me 
what your assessment is? 

P.S. Han-Sheng, can you please post the design files for the holding box?

Thanks
Zhenyu

Attachment: T-Board 1.jpg
Description: T-Board 1.jpg