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[Yi Yang <yiyang AT ncku.edu.tw>]

Dear all,

This is the updated version (v2) of the document for Mechanical Structure. 

https://www.dropbox.com/s/cndffu9ybv8zkyu/Mechanical_Structure_for_FST_at_STAR_v2.pdf?dl=0

We've put all the details in this version and the only thing left is the "thermal analysis". This will be updated soon.

Cheers,

Yi

+++++++++++++++++++++++++++++++++++++++++++++++++++
Yi Yang, Associate Professor
Department of Physics
National Cheng Kung University
Tainan, 701 Taiwan
E-Mail: yiyang AT ncku.edu.tw
Tel: +886-6-2757575 ext.65237
Fax: +886-6-2747995
Group Web: http://phys.ncku.edu.tw/~yiyang
+++++++++++++++++++++++++++++++++++++++++++++++++++

On Tue, Jul 14, 2020 at 12:35 AM Zhenyu Ye <yezhenyu2003 AT gmail.com> wrote:

Minutes:

0. follow-ups on the action items from last week (see *** below)
1) Design light-tight box for the DAQ integration test at BNL - Rahul/Flemming
-> Flemming had a look at the FST storage box drawings. Has settled on the possible light-tight box dimensions and structure.
-> Rahul will check whether abandoned boxes which were used for other projects can be used. Will look for them and get their dimensions.

2) Finalize how to mount modules onto the half-rings, and half-rings onto support structure - Rahul/Yi
-> Got confirmation from EASTON that they can make the changes to the mechanical structure.
-> Zhenyu will discuss with Fermilab engineers whether or not they can accommodate these changes (waiting for 3)

3) Document the proposed changes in the Mechanical structure - Yi
-> will send by Wednesday

4) Document the procedure and requirements of the module production steps that NCKU is responsible for - Yi
-> will send a new version tomorrow

5) Look into radiation tolerance test of soft cooling tubes - Yi
-> Got the second batch of tubes back from irradiation. Tests with NOVEC started.

6) Tune the timing setting for ADC sampling - Xu/Gerard
-> No update

7) Studying the tracking performance by varying the Z-locations of FST disks, and number of r/phi segments - Daniel/Krishan
-> see below for update on tracking code
-> decide to drop this task.

8) Looking into FST simulation and track reconstruction to compare 300 vs 500 micron thick sensors - Shenghui/Zhenyu
-> See below. Based on the results, this task is considered complete.

9) FST slow simulator with efficiency/resolution measured with prototypes and study tracking performance - Gavin/Shenghui/Xu

1. Integration                                                                by Rahul Sharma
-> Rahul contacted an external machine shop with wire EDM capability. Initial quote $50k. Will reach out to machine shops at Universities to see if one can get a better deal
-> Felix working on detailing the design, putting in the cables and cooling tubes.
-> Bob Struble made good progress in cooling system. order charcoal filters, the last missing piece. Rahul discussed with Bob how to set up the test in Nov with FST module. Also plan to include the soft cooling tube in the test.

2. Tracking Software and Studies                                 by Daniel Brandenburg, Krishan Gopal
-> Updated the tracking code to have the flexibility to use the old built-in function or FstFastSimulator to get the smeared FST hits for track reconstruction
-> Will update the readme and corresponding config file

3. Simulation Studies                                                    by Shenghui Zhang
-> Updated the plots for secondary versus primary particles, by changing the definition of primary particles.
-> Made material budget plot for FST with some tricks to get around some technical problem of the tool. The results seem to be reasonable.
-> ~5% extra material to that of [Beam Pipe+FST] by changing from 300 to 500 micron Silicon. Number of secondary particles produced from FST increase by 5%.
Conclusion: Changes are negligible.

4. Prototype Module Assembly and Test                       by Xu Sun, Gavin Wilks, Zhenyu Ye
-> Discussed Issues with module assembly at Fermilab: 1) displacement of chips: find out where the problem come from and correct 2) chip/sensor wire-bonding: ask Fermilab technician to take a close look at FST04 during assembly and provide detailed feedbacks and assessment
-> First fully assembled and working FST module. Inner sensor behaves as expected
Action items:
For FST04 assembly
1) measure positions at Fermilab before mounting chips/sensors
2) document issues and provide an assessment whether the quality of FST04 is acceptable for production

5. Mechanical structure                                                 by Yi Yang
-> Got the second batch of tubes back from irradiation. Tests with NOVEC started.
-> Sent FST04 to Zhenyu last week
-> Easton is ok with the proposed changes to the design. Use customized precision bushing and pins.
Action item: measure directly the pads on hybrids w.r.t. reference points on module at NTU for future hybrid-MS assembly work

6. F2F Meeting and Production Readiness Review
-> Yi available after 10:30am for both F2F and review
-> invited reviewers, Jim Stewart (chair), Gerrit (Silicon), Jim Mills (Mechanics), Maybe one more
-> Flemming working on the charge for the review.
-> Prepare documents for review

*** Action items from previous weeks ***
1) Design light-tight box for the DAQ integration test at BNL - Rahul/Flemming
2) Finalize how to mount modules onto the half-rings, and half-rings onto support structure - Rahul/Yi/Zhenyu
-> Zhenyu will discuss with Fermilab engineers whether or not they can accommodate the changes to MS (waiting for 3)
3) Document the proposed changes in the Mechanical structure - Yi
4) Document the procedure and requirements of the module production steps that NCKU is responsible for - Yi
5) Look into radiation tolerance test of soft cooling tubes - Yi
6) Tune the timing setting for ADC sampling - Xu/Gerard
7) FST slow simulator with efficiency/resolution measured with prototypes and study tracking performance - Gavin/Shenghui/Xu


> On Jul 9, 2020, at 11:09 PM, Zhenyu Ye <yezhenyu2003 AT gmail.com> wrote:
>
> Dear all,
>
> We will have the Weekly FST meeting on Monday starting at 9am EST (BNL local time).
>
> Bluejeans Meeting URL https://bluejeans.com/101020434
> Meeting ID: 101 020 434
>
> https://drupal.star.bnl.gov/STAR/event/2020/07/13/star-forward-silicon-tracker-meeting
>
> 0. follow-ups on the action items from last week (see *** below)
> 1. Integration                                                                      by Rahul Sharma, Felix Archampong
> 2. Tracking Software and Studies                                 by Daniel Brandenburg, Krishan Gopal
> 3. Simulation Studies                                                    by Shenghui Zhang
> 4. Prototype Module Assembly and Test                       by Xu Sun, Gavin Wilks, Zhenyu Ye
> 5. Mechanical structure                                                 by Yi Yang
> 6. F2F Meeting and Production Readiness Review
>
> *** Action items from previous weeks ***
> 1) Design light-tight box for the DAQ integration test at BNL - Rahul/Flemming
> 2) Finalize how to mount modules onto the half-rings, and half-rings onto support structure - Rahul/Yi
> 3) Document the proposed changes in the Mechanical structure - Yi
> 4) Document the procedure and requirements of the module production steps that NCKU is responsible for - Yi
> 5) Look into radiation tolerance test of soft cooling tubes - Yi
> 6) Tune the timing setting for ADC sampling - Xu/Gerard
> 7) Studying the tracking performance by varying the Z-locations of FST disks, and number of r/phi segments - Daniel/Krishan
> 8) Looking into FST simulation and track reconstruction to compare 300 vs 500 micron thick sensors - Shenghui/Zhenyu
> 9) FST slow simulator with efficiency/resolution measured with prototypes and study tracking performance - Gavin/Shenghui/Xu
> _______________________________________________
> Star-fst-l mailing list
> Star-fst-l AT lists.bnl.gov
> https://lists.bnl.gov/mailman/listinfo/star-fst-l

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