Star-fst-l mailing list

[Gerard Visser <gvisser AT indiana.edu>]

hi Yi,
	The epoxy to bond hybrid to structure I see now for the first time in appendix 
S. It is kind of viscous stuff, if I do not misunderstand, I'm a little 
surprised. Did IST construction use this same epoxy for hybrid bonding?
        Sincerely,

                Gerard


On 7/15/2020 6:28 AM, Yi Yang wrote:
> Dear all,
>
> This is the updated version (v2) of the document for Mechanical Structure.
> https://urldefense.com/v3/__https://www.dropbox.com/s/cndffu9ybv8zkyu/Mechanical_Structure_for_FST_at_STAR_v2.pdf?dl=0__;!!P4SdNyxKAPE!TDk4aFFjamYOHpUD81U0sMz9IbNtShOD9ShYahBsjV09OP9t-0LrMuJNg_8lWJVSOHizgSY$  
> <https://urldefense.com/v3/__https://www.dropbox.com/s/cndffu9ybv8zkyu/Mechanical_Structure_for_FST_at_STAR_v2.pdf?dl=0__;!!P4SdNyxKAPE!QH-FvCCosYLPIbwk0jMkcwXSSINHD-ApO2Qa3ZCzDS9bvba0UKYr3IPryMuXOAtDkv1Q7Y4$>
>
> We've put all the details in this version and the only thing left is the 
> "thermal analysis". This will be updated soon.
>
> Cheers,
> Yi
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> Yi Yang, Associate Professor
> Department of Physics
> National Cheng Kung University
> Tainan, 701 Taiwan
> E-Mail: yiyang AT ncku.edu.tw <mailto:yiyang AT ncku.edu.tw>
> Tel: +886-6-2757575 ext.65237
> Fax: +886-6-2747995
> Group Web: https://urldefense.com/v3/__http://phys.ncku.edu.tw/*yiyang__;fg!!P4SdNyxKAPE!TDk4aFFjamYOHpUD81U0sMz9IbNtShOD9ShYahBsjV09OP9t-0LrMuJNg_8lWJVS92CI5-8$  
> <https://urldefense.com/v3/__http://phys.ncku.edu.tw/*yiyang__;fg!!P4SdNyxKAPE!QH-FvCCosYLPIbwk0jMkcwXSSINHD-ApO2Qa3ZCzDS9bvba0UKYr3IPryMuXOAtDeKWuHtw$> 
>
> +++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
> On Tue, Jul 14, 2020 at 12:35 AM Zhenyu Ye <yezhenyu2003 AT gmail.com 
> <mailto: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