Star-fst-l mailing list

[Gerard Visser <gvisser AT indiana.edu>]

Hi Flemming,
	I think that that is certainly the right plan. But if later there is a problem 
developed and found just before (or after) insertion, I suppose we might want to 
try to fix it in situ rather than dismounting and taking back to the clean roon?
	If the decision is that for any repair we remove the half to the clean room, 
then we don't have to worry about the risk to TPC/BEMC electronics in case any 
small part is dropped.  I think we can work on it carefully in place if need be 
though, we did so for FGT. But we should try to avoid very small loose parts -- 
and anyway as Yi said they also pose a risk for the FST itself.

        Gerard


On 8/12/2020 1:15 PM, videbaek wrote:
> I would hope that all the cable mounting and dressing would be done on the 
> half-structures in the clean room so the setup could be checked out there as the 
> modules arrive. But in any case you want to make it as simple and safe as possible.
>
> best F.
>
>
> On 2020-08-12 08:59, Yi Yang wrote:
> > Hi Gerard,
> >
> > Ahh... sorry, I forgot to reply this point.
> >
> > Actually I don't think we will use those loose nuts for the final
> > assembly.
> > I totally agree with you that it is extremely dangerous to use them. I
> > dropped them on the chip and sensor areas many times while mounting
> > the T-board on.
> >
> > We didn't decide how to mount them yet, so any suggestions are very
> > welcome.
> >
> > 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: 
> > https://urldefense.com/v3/__http://phys.ncku.edu.tw/*yiyang__;fg!!P4SdNyxKAPE!VAiPy1lSYNWxsoS_nLbQ9qCAiTsWdUyIUD-IXVA3-XPawTyUMi3wK2JvQp5lX7K4Nvt-UKQ$
> >   [1]
> > +++++++++++++++++++++++++++++++++++++++++++++++++++
> >
> > On Wed, Aug 12, 2020 at 8:55 PM Gerard Visser <gvisser AT indiana.edu>
> > wrote:
> >
> > > hi Yi,
> > > Please think about if there is any reasonable alternative to
> > > using those small
> > > loose nuts. Dropping them inside the magnet would be a risk for
> > > STAR.
> > > Thanks,
> > >
> > > Gerard
> > >
> > > On 8/12/2020 8:50 AM, Yi Yang wrote:
> > > > Hi Gerard,
> > > >
> > > > Not a program at all, it is good that we are on the same page. :-)
> > > >
> > > > 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!VAiPy1lSYNWxsoS_nLbQ9qCAiTsWdUyIUD-IXVA3-XPawTyUMi3wK2JvQp5lX7K4Nvt-UKQ$
> > > >   [1]
> > > > +++++++++++++++++++++++++++++++++++++++++++++++++++
> > > >
> > > >
> > > > On Wed, Aug 12, 2020 at 2:07 AM Gerard Visser <gvisser AT indiana.edu
> > >
> > > > <mailto:gvisser AT indiana.edu>> wrote:
> > > >
> > > > hi Yi,
> > > > I apologize I was confused on that first point, I
> > > didn't remember
> > > > that there
> > > > were capacitors on both sides of the T-board, which is clear
> > > from a look at the
> > > > gerber files again. The plan for new version is then that all
> > > will be on the
> > > > side facing away from mechanical structure, OK. Sorry.
> > > >
> > > > Gerard
> > > >
> > > >
> > > > On 8/11/2020 8:16 AM, Gerard Visser wrote:
> > > > > hi Yi,
> > > > >      I am consfused by the pictures since don't the big
> > > tantalum
> > > > capacitors on
> > > > > existing T-board face towards the mechanical structure?
> > > That was said to
> > > > be the
> > > > > problem, which is now being fixed. But it doesn't look like
> > > a problem in
> > > > your
> > > > > pictures???
> > > > >      Were you able to actually plug in the outer hybrid? It
> > > looks like
> > > > you did.
> > > > >      Also as a small comment, will it really be good to use
> > > loose nuts
> > > > for this
> > > > > fastening? We should as much as possible avoid the risk of
> > > dropping small
> > > > parts,
> > > > > *especially* for an operation that might have to be
> > > performed with the
> > > > FST in
> > > > > STAR out on the insertion rails, above and around the TPC
> > > and BEMC
> > > > electronics
> > > > > boards which are all exposed there. I had though there
> > > would be
> > > > press-nuts on
> > > > > one side or the other. Maybe this is impossible, at least
> > > now, but we should
> > > > > think about it.
> > > > >      Sincerely,
> > > > >
> > > > >          Gerard
> > > > >
> > > > >
> > > > > On 8/10/2020 11:33 PM, Yi Yang wrote:
> > > > > > Hi all,
> > > > > >
> > > > > > We tried to mount the T-Board onto MS and it seems to be
> > > okay.
> > > > > > But I think we should prepare some toolings for the
> > > installation.
> > > > > > Please check some photos in the following link:
> > > > > > T-Board_mounting.pdf
> > > <https://drupal.star.bnl.gov/STAR/system/files/T-Board_mounting.pdf>
> > > > > > 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>
> > > > <mailto: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!SAQPx9Ri_U0LMsI-kJryuTi7kmQ5x9z2cuwXyVQr_mwgVrxl6XH6qVUc5nh1_agdRO6tNDw$ 
> >
> > > > > >
> > <https://urldefense.com/v3/__http://phys.ncku.edu.tw/*yiyang__;fg!!P4SdNyxKAPE!RrBFMBGZeyx7A9EvAOYEtwDPoTzu6UesNtbcWnWCrk3Ntska06asz6ZScNS3e41dLZMtdaQ$> 
> >
> > > > > > +++++++++++++++++++++++++++++++++++++++++++++++++++
> > > > > >
> > > > > >
> > > > > > On Tue, Aug 11, 2020 at 1:25 AM Ye, Zhenyu
> > > <yezhenyu AT uic.edu
> > > > <mailto:yezhenyu AT uic.edu>
> > > > > > <mailto:yezhenyu AT uic.edu <mailto:yezhenyu AT uic.edu>>>
> > > wrote:
> > > > > >     Minutes:
> > > > > >
> > > > > >     1. Flemming showed a draft of committee
> > > recommendations. He will have a
> > > > > >     meeting with the committee this afternoon. Expect to
> > > have a final
> > > > version
> > > > > > soon.
> > > > > >
> > > > > >     2. Silicon sensors
> > > > > >     -> Zhenyu: requested for a new quote from Hamamatsu.
> > > Partial delivery of
> > > > > >     Silicon sensors is not possible.
> > > > > >
> > > > > >     3. Use thermal camera with cooling applied to the
> > > other side of the
> > > > > >     mechanical structure to check if there is air trapped
> > > between hybrid
> > > > and MS
> > > > > >     -> Yi: trying it this week. Consider doing this in
> > > production
> > > > > >     4. Update the T-board design
> > > > > >     -> Jianing will update the design this week
> > > > > >     1) Move the capacitor to the other side
> > > > > >     2) Add two ground holes
> > > > > >     3) Tolerance for mounting T-board on the MS, taking
> > > into account the
> > > > > >     constraint from connecting the outer hybrid
> > > > > >     4) Check mounting T-board on the MS -> Yi will do it
> > > at NCKU
> > > > > >     5. Split HV for inner and outer
> > > > > >     -> Decided to split HV. Mike/Gerard will look into the
> > > changes to
> > > > PPB and
> > > > > >     back-of-crate boards
> > > > > >
> > > > > >     6. Integration
> > > > > >     -> Rahul: will do a tolerance analysis, taking into
> > > account the
> > > > > >     clearance/project requirements but also what can be
> > > achieved by the
> > > > machine
> > > > > >     shop. Need to have a plan for survey and discuss with
> > > Survey group
> > > > > >     7. Simulation
> > > > > >     -> Gavin/Shenghui: slow simulator based on cosmic data
> > > is ready.
> > > > Trying to
> > > > > >     run the tracking code on RCF.
> > > > > >
> > > > > >     8. Mechanical structure
> > > > > >     ->  Yi: Han-Sheng leaving the project next week for
> > > PhD in US. Test
> > > > the new
> > > > > >     procedure with old hybrids. Will verify with the
> > > vendor about
> > > > changes to the
> > > > > >     precision pin: lead and pin lengths
> > > > > >
> > > > > >     ***** Action items *****
> > > > > >     1) Design and fabricate light-tight box for the DAQ
> > > integration test
> > > > at BNL
> > > > > >     - Rahul/Flemming
> > > > > >     2) Design the cooling lines, and cable trays between
> > > disks and cooling
> > > > > >     manifold - Felix/Rahul
> > > > > >     3) Finalize how to mount modules onto the half-rings,
> > > and half-rings
> > > > onto
> > > > > >     support structure, and document the proposed changes
> > > to the mechanical
> > > > > >     structure - Rahul/Yi/Zhenyu
> > > > > >     4) Survey procedure/requirements - Rahul
> > > > > >
> > > > > >     5) Prepare documents for prelim Safety review with
> > > C-AD - all
> > > > > >     6) Get updated quote from Hamamatsu - Zhenyu
> > > > > >     7) Design and fabricate module storage boxes for
> > > production at UIC -
> > > > > > Xu/Andres
> > > > > >     8) Duplicate the module assembly tooling at UIC -
> > > Xu/Zhenyu
> > > > > >     9) Discuss with Fermilab about module assembly
> > > schedule - Zhenyu
> > > > > >     10) Update the T-board design to avoid the conflict
> > > with Mechanical
> > > > > >     structure - Jianing/Maowu
> > > > > >     11) Check how T-board mount onto MS - Yi
> > > > > >
> > > > > >     12) Look into splitting the inner and outer sensor HV
> > > bias - Mike/Gerard
> > > > > >     13) Send the problematic prototype cable-T-board
> > > assembly to Mike for
> > > > > >     investigation - Zhenyu/Mike
> > > > > >     14) Develop the QC procedure for Inner cable and
> > > T-board assembly -
> > > > > > Mike/Maowu
> > > > > >
> > > > > >     15) Look into the overall large CMN noise, and the
> > > abnormal noise of few
> > > > > >     channels first appear in the readout - Gerard/Xu
> > > > > >     16) Check the FST noise performance at high readout
> > > rate - Xu/Zhenyu
> > > > > >     17) Sett up the laser test stand to characterize
> > > prototype module
> > > > > >     performance - Andres/Zhenyu
> > > > > >     18) FST slow simulator with efficiency/resolution
> > > measured with
> > > > prototypes
> > > > > >     and study tracking performance - Gavin/Shenghui
> > > > > >
> > > > > >      > On Aug 8, 2020, at 10:48 AM, Ye, Zhenyu
> > > <yezhenyu AT uic.edu
> > > > <mailto:yezhenyu AT uic.edu>
> > > > > >     <mailto:yezhenyu AT uic.edu <mailto:yezhenyu AT uic.edu>>>
> > > 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/2020/08/10/star-forward-silicon-tracker-meeting 
> >
> > > > > >      >
> > > > > >      > 0. follow-ups on review and action items
> > > > > >      > 1. Integration                by Rahul Sharma,
> > > Felix Archampong
> > > > > >      > 2. Hybrid and T-board
> > >
> > > > by
> > > > > >     Maowu Nie, Jianing Dong
> > > > > >      > 3. Simulation Studies     by Gavin Wilks, Shenghui
> > > Zhang, Daniel
> > > > > > Brandenburg
> > > > > >      > 4. Prototype Module Assembly and Test
> > > by
> > > > Zhenyu Ye
> > > > > >      > 5. Mechanical structure       by Yi Yang
> > > > > >      > _______________________________________________
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> > > <mailto:Star-fst-l AT lists.bnl.gov>>
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