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[Zhenyu Ye <yezhenyu2003 AT gmail.com>]

Hi Li, 

Regarding the first question, my proposal would be to 

use shared bias for inner/outer sensors as the default running scheme
but keep the option of using separate biases (the motivation is that if the 
leakage current for the inner sensor is too high due to larger radiation does)

This means that we 

1) make no modification to the existing IST back of crate boards, 
outer-signal cables and patch panel boards
2) have separate bias lines on inner signal cables and T-board 

Steve probably has already mentioned it but I forgot the answer: is it 
already the case that inner signal cable has separate bias lines for the 
inner/outer sensors?

Zhenyu

> On Feb 15, 2019, at 8:34 AM, LI YI <li.yi AT sdu.edu.cn> wrote:
> 
> Dear All,
> 
> Here is a follow-up to yesterday's meeting.
> 
> 1. Two biases for inner and outer hybrids:
> The current T-board has two separate biases for inner and outer
> hybrids. If we want to share bias between two hybrids, we can add a
> jumper.
> 
> 2. Two connectors (for inner and outer hybrids) on the same side of T-board:
> During yesterday's meeting, it is suggested that it will be easier to
> assemble T-board and hybrids if two connectors are on the same side.
> Could anyone elaborate more why it is easier to assemble with the same
> side connectors? It would be nice to evaluate the pros and cons
> carefully before the final decision is made (due to 1. time constrains
> see below, 2.the possibility of more layers, six layers instead of
> current four, which may increase the complexity for manufacturing)
> 
> 3. Production time:
> T-board ~ 10 days
> Hybrid ~ 2-3 weeks
> Usually it takes more than one round to get it right by the vendor.
> One round means that vendor produces it and we test and give feedback
> to vendor. That means, it is likely to take at least 2 times 2-3weeks
> = 4-6 weeks to give hybrid right and 2 times 10 days  = 20 days to get
> T-board right.
> 
> Best,
> Li
> 
> On Thu, Feb 14, 2019 at 7:06 AM Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
>> 
>> Dear all,
>> 
>> We will have a meeting to discuss Forward Silicon Tracker tomorrow at 9am 
>> BNL time. The meeting agenda and bluejeans info can be found at
>> 
>> https://drupal.star.bnl.gov/STAR/blog/yezhenyu/forward-silicon-tracker-weekly-meeting
>> 
>> Best,
>> Zhenyu
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> 
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