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[Zhenyu Ye <yezhenyu2003 AT gmail.com>]

Thanks, Han-Sheng. Can you please tell me the difference(s) if any to 

https://drupal.star.bnl.gov/STAR/blog/hshengli/fst-cad1102

Zhenyu

> On Dec 18, 2019, at 5:00 AM, Han-Sheng Li <acidhf AT gmail.com> wrote:
> 
> Hi Zhenyu,
> 
> This is the updated disks of mechanical structure: 
> https://drupal.star.bnl.gov/STAR/blog/hshengli/fstcaddisks1218
> 
> Cheers,
> Han-Sheng 
> 
> Zhenyu Ye <yezhenyu2003 AT gmail.com> 於 2019年12月18日 週三 上午2:07寫道：
> Attendees: Han-Sheng, Xu, Yi, Zhenyu
> 
> Mechanical structure - Yi
> 1) increase the thickness from 1.5 to 2mm, may achieve 200 micron flatness 
> (will get the result on Friday). If so, glue layer between hybrid and 
> structure can be used to improve further to 100 micron. 
> 2) remove carbon fiber to increase the flow rate
> 3) add carbon fiber sheet?
> 4) change the shape/thickness of the ribs
> 
> Gluing jig status - Yi
> AIDC is working on the design 
> 
> Schedule - Yi
> Jan 3, assuming mounting hybrids
> Jan 4-10, AIDC glue mechanical structure and hybrids 
> Jan 15, send to UIC
> 
> Storage box
> NCKU will design and make a few boxes for prototype modules. Yi will 
> discuss with Han-Sheng about the current design
> 
> > On Dec 16, 2019, at 8:43 AM, Zhenyu Ye <yezhenyu2003 AT gmail.com> wrote:
> > 
> > 
> >> On Dec 12, 2019, at 6:00 PM, Zhenyu Ye <yezhenyu2003 AT gmail.com> wrote:
> >> 
> >> 3. Mechanical structure - Yi
> >> 3rd version of mechanical structures were delivered by EASTON. The 
> >> changes w.r.t. v2 includes 1) a new type of PEEK+30% CF material that 
> >> flow better during injection and thus less bending than the old type 
> >> material 2) remove the center part of the outer region. The data from 
> >> one set of the structures indicates bending around 500 and 700 microns 
> >> for inner and outer region structures, respectively. The former seems to 
> >> be worse than the previous version and Yi will try to find out the 
> >> explanation from EASTON. 
> >> Moving forward, Yi is going to ask EASTON to increase the thickness of 
> >> the structure from 1.5mm to 2mm, which EASTON expects to improve the 
> >> bending issue. This will take 1.5-2 weeks to see the results. Yi will 
> >> also discuss with AIDC next Monday is to add CF sheets to increase the 
> >> stiffness and thus improve the surface flatness. Yi agreed that we will 
> >> have a meeting to discuss his findings next Monday 3:30pm BNL time.
> > 
> > https://drupal.star.bnl.gov/STAR/event/2019/12/16/star-forward-silicon-tracker-meeting
> > 
> >> Han-Sheng is working on a new Thermal-Stress simulation with the latest 
> >> design, and may report next week. 
> > 
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