sPHENIX MAPS tracker discussion

[Sho Uemura <meeg AT slac.stanford.edu>]

Hi Ming,

I think you might have already seen this (and it does not directly answer 
your question) but probably not everyone has. ALICE presented a test of 
the IB wirebonds in a magnetic field in their stave PRR (slides 25-26):

https://indico.cern.ch/event/631636/contributions/2553690/attachments/1447763/2236573/MKeil_IBCharacterisation-2.pdf

For those without access to the slides, this is the summary:

Setup and Procedure:
* Chip placed in 0.5 T magnetic field with bond wires parallel to B-field
* Digital injections into 1024 pixels (3-4 times max. occupancy expected 
in L0)
* Scan of trigger frequency between 40 kHz and 400 kHz

Observations:
* Chip kept working throughout (and after) test
* Monitoring of bond wires with USB microscope did not reveal any movement 
of the bond wires

On Tue, 10 Jul 2018, mxliu wrote:

> Dear Miguel and Leo,
>
>
>
> Do you know the resonance frequencies of MAPS wire bond? Although it was 
> argued that it is not an issue for ALICE ITS, I think sPHENIX should 
> reconsider this carefully since we are going to operate at lower trigger rate 
> ~15kHz, compared to ALICE?s 50kHz/Continuous readout(~100kHz).
>
>
>
> For the previous PHENIX pixel detector, the resonance frequencies range from 
> 5~12 kHz, see the slides sent out by Eric.
>
>
>
> Cheers,
>
> Ming  
>
>
>
> --
>
> Ming Xiong Liu
>
> P-25, MS H846                     TEL:505-667-7125
>
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>
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>
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>
>
>
>
>
> From: Miguel Arratia <marratia AT berkeley.edu>
> Date: Tuesday, July 10, 2018 at 8:54 AM
> To: "Ming Liu (BNL)" <ming AT bnl.gov>
> Cc: eric mannel <mannel AT bnl.gov>, leo greiner <lcgreiner AT lbl.gov>, sPHENIX-MVTX 
> <sphenix-maps-l AT lists.bnl.gov>
> Subject: Re: [Sphenix-maps-l] Wire bonds in a magnetic field
>
>
>
> Dear Ming,
>
>
>
> Please find attached a presentation and report about the encapsulation study 
> that I did with Leo,
>
> best regards,
>
> Miguel
>
>
>
> On Tue, Jul 10, 2018 at 6:08 AM Ming Liu <ming AT bnl.gov> wrote:
>
> Hi Eric,
> Thanks for the link.
> Leo - you mentioned there is an ALICE document on this, could you send it if 
> available?
> Cheers
> Ming
>
> Sent from my iPhone
>
> > On Jul 10, 2018, at 12:12 AM, eric mannel <mannel AT bnl.gov> wrote:
> >
> > There was discussion today on the vibration of wire bonds in a magnetic field as a 
> > result of pulsed signals.  Here  is a link to the PHENIX VTX study that concluded the 
> > need to encapsulate the VTX pixle/strip-pixel/FVTX wire bonds. I think I posted it on a 
> > "public" page that everyone can access, if you have problems let me know,
> >
> > The summary presentation: 
> > https://www.phenix.bnl.gov/phenix/WWW/publish/mannel/sPHENIX/ResultOfVibrationTest.ppt
> >
> > I am still searching for additional information/presentations and will post 
> > if found.
> >
> > Eric
> >
> > --
> > Eric J. Mannel, Ph.D.
> > PHENIX Group
> > Physics Dept.
> > Brookhaven National Laboratory
> > 631/344-7626 (Office)
> > 914/659-3235 (Cell)
> >
> > _______________________________________________
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> > sPHENIX-MAPS-l AT lists.bnl.gov
> > https://lists.bnl.gov/mailman/listinfo/sphenix-maps-l
>
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