sPHENIX MAPS tracker discussion

[mxliu <ming AT bnl.gov>]

Hi Sho,
Thanks for the link, yes, I am aware of the work. 
My main concern is about the low trigger rate of sPHENIX (~15kHz), compared 
to ALICE's ~50kHz. 
And several recent silicon detector wirebonds have resonances ~10kHz (PHENIX, 
CMS etc., for typical L~0.5cm wires), and I was wondering about what ALICE 
ITS has.

Cheers,
Ming

-- 
Ming Xiong Liu
P-25, MS H846                     TEL:505-667-7125 
Physics Division                             631-344-7821(BNL)
LANL                                               630-840-5708(FNAL)
Los Alamos, NM 87545      FAX:        505-665-7020
 

-----Original Message-----
From: Sho Uemura <meeg AT slac.stanford.edu>
Date: Wednesday, July 11, 2018 at 12:56 PM
To: "Ming Liu (BNL)" <ming AT bnl.gov>
Cc: Miguel Arratia <marratia AT berkeley.edu>, sPHENIX-MVTX 
<sphenix-maps-l AT lists.bnl.gov>, Walter Sondheim <sondheim AT lanl.gov>
Subject: Re: [Sphenix-maps-l] Wire bonds in a magnetic field

    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
    >
    > Physics Division                             631-344-7821(BNL)
    >
    > LANL                                               630-840-5708(FNAL)
    >
    > Los Alamos, NM 87545      FAX:        505-665-7020
    >
    >
    >
    >
    >
    > 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)
    >>
    >> _______________________________________________
    >> sPHENIX-MAPS-l mailing list
    >> sPHENIX-MAPS-l AT lists.bnl.gov
    >> https://lists.bnl.gov/mailman/listinfo/sphenix-maps-l
    >
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