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[Maowu Nie <nie AT rcf.rhic.bnl.gov>]

Hi Zhenyu,

About the hybrid, we need to focus on two things:

1. variation of thickness.

2. variation of pad distance

Based on the discussion, we just contacted with the two vendors.

The old vendor: The thickness variation of FPCB can be further reduced to +/-30μm by multiple adjusting the thickness of each layer. But it's hard for them to reduce the variation of pad distance.

The new vendor: The variation (+/-50μm) of the thickness is the limit they can do now. But for the variation of pad distance, by adjusting some parameters in their configuration files, it can be further reduced to 0.10% (currently 0.15%).

We will try to do the flatness test of the hybrid when we go back to SDU.

Thanks,

Jianing and Maowu

On Mar 6, 2020, at 6:57 AM, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:

Dear all,

We will have the Weekly FST meeting on Monday starting at 9am EST (BNL local time). Please note that the Daylight Saving Time in the US starts on Sunday March 8, i.e., when US local standard time is about to reach Sunday, March 8, 2020, 2:00:00 am clocks are turned forward 1 hour to Sunday, March 8, 2020, 3:00:00 am local daylight time instead. This implies that the meeting will start one hour early if you are in Qingdao/Tainan.

Bluejeans Meeting URL https://bluejeans.com/101020434
Meeting ID: 101 020 434

https://drupal.star.bnl.gov/STAR/blog/yezhenyu/forward-silicon-tracker-weekly-meeting

Tentative meeting agenda:

1. Mechanical structure                                   by Yi Yang/Han-Sheng Li
2. Prototype Module Assembly and Test         by Zhenyu Ye, Xu Sun/Andres Aguilar
3. FST Fast Simulator and Geometry Check   by Te-Chuan Huang
4. Tracking Studies                                          by Krishan Gopal

Best,
Zhenyu
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