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[videbaek <videbaek AT bnl.gov>]

Hi Gerard,
thanks for your input. I just want to remind all that we have a plan for 
checking out  the full chain with the system in November or so 
connecting to DAQ. We should take this opportunity to have mods done for
a few boards so we can run and exercise a (test) module in the Hall.

best F.


On 2020-08-11 16:34, Gerard Visser wrote:
> hi Zhenyu & all,
>         I looked at all out schematics concerning the bias voltage
> connections and things should work out very well. We have to un-do the
> changes that we unfortunately made to all the PPB, which was not wise
> to have done before we had a final plan. But it should be feasible.
> And then we have to modify the ABC boards (18 of them) to cut two of
> the signal pairs from the ARM connector and instead wire to two new
> BNC conenctors (or to two cable pigtails to BNC connectors, would be
> OK). It would be possible to build 18 new ABC boards instead, but the
> D connectors if we use same high quality ones are rather expensive.
> Mike should please consider the pro/con for modification vs. new ABC
> boards.
>         Attached slides summarize the detector bias connections from the
> detectors to the BNC connectors. Mike please check that I didn't get
> something wrong, of course.
>         Let's call this decided, and get the PPB's back to their original
> state, and modify one or a few of the ABC boards for the test
> setup(s).
>         Sincerely,
>
>                 Gerard
>
> p.s. We should hi-pot the bias connections (up to T-board, unplugged
> from the hybrids) to some test voltage that makes sense (TBD) based on
> maximum operating voltage you expect. What is that max operating
> voltage?
>
>
> On 8/10/2020 1:25 PM, Ye, Zhenyu 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> 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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> > > Star-fst-l AT lists.bnl.gov
> > > https://lists.bnl.gov/mailman/listinfo/star-fst-l
> >
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--
Flemming Videbaek
senior scientist
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596