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US CMS Silicon Tracker Project Regina Demina KSU Florida State University May 11, 2002. CDF SVX installation. A bit of history. December 1999 – CMS made a decision to go with all silicon tracker = 68m 2 (inner barrel and disks) + 164m 2 (outer barrel and disks) = 232m 2 - PowerPoint PPT Presentation
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US CMS Silicon Tracker ProjectUS CMS Silicon Tracker ProjectRegina DeminaRegina Demina
KSUKSU
Florida State UniversityFlorida State UniversityMay 11, 2002May 11, 2002
A bit of history
End of 1999 – CDF and DØ silicon detectors (~10 m2 of silicon, ~2M channels) out of SiDet to be installed in collision halls
December 1999 – CMS made a decision to go with all silicon tracker =
68m2(inner barrel and disks) + 164m2(outer barrel and disks) = 232m2
5.1 M + 5.6 M = 10.7 M channels
CDF SVX installation
A natural decision for US institutions to join the silicon effort.
Fermilab B. Flaugher, R. Lipton, P. Rapidis, L. Spiegel, S. Tkaczyk
Kansas State University T.Bolton,R.Demina,W.Kahl,S.Korjenevski, W.Reay, R.Sidwell, N.Stanton
Northwestern University D. Buchholz
Texas Tech University A. Sill
University of California, Riverside Gail Hanson
University of California, Santa Barbara C.Campagnari, D. Hale, J.Incandela
University of Illinois, Chicago L. Chabalina, C. Gerber
University of Kansas P. Baringer, A. Bean, L. Christofek, X. Zhao
University of Rochester R. Eusebi, E. Halkiadakis, A. Hocker, P. Tipton
Si Tracker Group
Two new groups
Will provide important support for the UCSB production line
Silicon tracker in Spring 2000
Single sided, low resistivity silicon sensors as a baseline technology extensively tested by RD20 – rad hard to >10 Mrad Several vendor qualified (6” production lines)
Working front end chip – APV25, some issues to be resolved with multiplexer chip – MUX PLL
Hybrids – two technologies considered Mechanics in excellent state – a lot inherited from MSGC’s Plan to start production in fall 2001
Outer Barrel Space Frame
Spring 2000
Outer Barrel Rods
Silicon modules
Spring 2000
Automated assembly
3 TOB modules/ 30 min
Gantry at CERNSpring 2000
SiTrkr Organization
Schedule Issues
Schedule slipped by ~ a year
Hybrid schedule is a concernDecision on technology was made in September 2000 prototyping was semi-successful might
change the technology
FEDs Initial models for testing of large quantities of FE hybrids and modules expected to be ready in late 2002Optical models for rod testing will be available 6/03
Optical hybrids for assembly of modules into Rods will be available in late 2002
Other critical items are performing better
GantriesPC based test standsProbe stationsSensors
FE Hybrid statusFE Hybrid status
• Industrial hybrid (V0 – unpackaged chips on ceramics) Industrial hybrid (V0 – unpackaged chips on ceramics) production started with 1production started with 1stst Producer. 160 Hybrids delivered Producer. 160 Hybrids delivered (yield 65%) They also say that “the feature size” of hybrid is (yield 65%) They also say that “the feature size” of hybrid is too small for mass production.too small for mass production.
• The 2The 2ndnd producer has still problems with shorts. producer has still problems with shorts.
• Design of the V1 version of the hybrid (packaged chips on Design of the V1 version of the hybrid (packaged chips on ceramic- easier to produce) done. Send order to 1ceramic- easier to produce) done. Send order to 1stst producer. producer.
• 40 substrates hybrids V2 (packaged chips on FR4) received, 40 substrates hybrids V2 (packaged chips on FR4) received, some 10 populated. Hybrids and substrates distributed for some 10 populated. Hybrids and substrates distributed for mechanical and electrical tests. They look ok. mechanical and electrical tests. They look ok. Likely change Likely change in technology choice. in technology choice.
HIP and pinhole effects on APV25
Highly Ionizing Particles produced in nuclear interactions, a rare
phenomenon) can saturate entire APV for ~200 ns Results in inefficiency of ~1.3%
Pinholes Leakage current directly into APV25 Typically disconnected from readout Signal inefficiency of >=2 connected
pinholes/APV Rate of new pinhole development <10/(few
100 wafers=1000 APV’s) Fixes
Change resistor value on hybrid (100 50)
APV inverter off – reduces dynamic range
PSI test beam planned at the end of May to
further study the effect US to provide modules
TOB Module
~20 cm
Build 6,000 TOB modulesCurrent plan 2/3:1/3 at FNAL:UCSB
2 sensors bonded together PA hybrid (4 APV25 chips)
CMS module production
Sensors probed at K-State Automated module assembly system – Gantry - is fully
commissioned at Fermilab Placement accuracy <5um 4 (+3) fully functional modules were delivered to CERN for test
beam studies at PSI.
m3
Module Testing at FNAL
ARCS CMS DAQ
Two test systems are now in operation at SiDet
From R&D to Production
R&D
CMS T
rack
er
production