Transcript Slide Title Goes Here

CMS at UCSB
Prof. J. Incandela
US CMS Tracker Project Leader
DOE Visit
January 20, 2004
Experimental Focus
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Some of the questions LHC Experiments could resolve:
What is the origin spontaneous symmetry breaking ?
What sets the known energy scales ?
QCD ~ 0.2 « VEVEWK ~ 246 « MGUT ~ 1016 « MPL ~ 1019 GeV
What comes next ?
• Supersymmetry ?
• Is this what explains the galactic dark matter ?
• Extra dimensions ?
• Something completely unexpected?
• Big questions nowadays require big machines…
UCSB CMS Group January 20, 2003, J. Incandela
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CERN Large Hadron Collider
CERN Large Hadron Collider
• 27 km around
• 1100 dipole magnets
• 14 m long
• 8.4 T field
• dual aperture
• Proton on proton: 14 TeV
• 25 ns between beam crossings
• Peak Luminosity 1034 cm-2 s-1
• 20 collisions per beam crossing
Challenge and Reward
•Higher Energy
•Broadband production
•BUT
• Total cross-section is very high!
• What’s interesting is rare
•The ability to find any of these
events is a consequence of evolved
detector design and technological
innovations:
• Multi-level trigger systems and
high speed pipe-lined electronics
• Precision, high rate, calorimetry
• Radiation-tolerant Silicon
microstrips and Pixel detectors
UCSB CMS Group January 20, 2003, J. Incandela
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SM Higgs at the LHC
Production and Decay
To a large extent, the quest for the
Higgs drives the design of the LHC
detectors.
Nevertheless, essentially all other
physics of interest require similar
capabilities
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Light SM Higgs
Lepton id, b tagging
and ET are crucial
Difficult (or impossible)
Energy resolution
must be exceptional,
tracking is crucial
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CMS Experiment at CERN
Most Ambitious Elements:
Calorimetry & Tracking
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CMS Inner Detector
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Inside of the 4 Tesla field of the largest SC Solenoid ever built
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Pixels: at least 2 Layers everywhere
Inner Si Strips: 4 Layers
Outer Si Strips: 6 Layers
Forward Silicon strips: 9 large, and 3 small disks per end
EM Calorimeter: PbWO4 crystals w/Si APD’s
Had Calorimeter: Cu+Scintillator Tiles
Outside: Muon detectors in the return yoke
UCSB CMS Group January 20, 2003, J. Incandela
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UCSB CMS Group January 20, 2003, J. Incandela
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Tracking
“Golden Channel”
Efficient & robust Tracking
Fine granularity to resolve nearby tracks
Fast response time to resolve bunch crossings
Radiation resistant devices
Reconstruct high PT tracks and jets
 ~1-2% PT resolution at ~ 100GeV (m’s)
Tag b jets
 Asymptotic impact parameter sd ~ 20mm
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CMS Tracker
Pixels
End Caps (TEC 1&2)
2,4 m
Inner Barrel & Disks
(TIB & TID)
Outer Barrel (TOB)
volume 24.4 m3
running temperature – 10 0C
UCSB CMS Group January 20, 2003, J. Incandela
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Pixels
CMS Pixels
• 45 million channels
• 100 mm x 150 mm pixel size
• Barrel: 4, 7 and 11 cm
• 2 (3) disks per end
Why Pixels ?
• IP resolution
• Granularity
• Peak occupancy ~ 0.01 %
• Starting point for tracking
• Radiation tolerance
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Silicon Strips
6 layers of 500 mm sensors
high resistivity, p-on-n
9+3 disks per end
Blue = double sided
Red = single sided
4 layers of 320 mm sensors
low resistivity, p-on-n
Strip lengths range from 10 cm in the inner layers to 20 cm in the outer layers.
Strip pitches range from 80mm in the inner layers to near 200mm in the outer layers
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Some Tracker Numbers
Silicon sensors
CF frame
FE hybrid
with FE
ASICS
Pitch adapter
UCSB CMS Group January 20, 2003, J. Incandela
• 6,136 Thin wafers
• 19,632 Thick wafers
300 μm
500 μm
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6,136 Thin detectors (1 sensor)
9,816 Thick detectors (2 sensors)
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3112 + 1512 Thin modules (ss +ds)
4776 + 2520 Thick modules (ss +ds)
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10,016,768 individual strips and readout
electronics channels
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78,256 APV chips
~26,000,000 Bonds
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470 m2 of silicon wafers
223 m2 of silicon sensors (175 m2 + 48 m2)
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APV25
• 0.25 mm radiation-hard CMOS
technology
• 128 Channel Low Noise
Amplifier
• ~8 MIP dynamic range
• 50 ns CR-RC shaper
• 192 cell analog pipeline
• Differential analog data output
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Efficiency, Purity, Resolution
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CMS Physics Reach
• HIGGS
• The Standard Model Higgs can be discovered over the entire
expected mass range up to about 1 TeV with 100 fb-1 of data.
• Most of the MSSM Higgs boson parameter space can be
explored with 100 fb-1 and all of it can be covered with 300 fb-1.
• SUSY
• squarks and gluinos up to 2 to 2.5 TeV or more
• SUSY should be observed regardless of the breaking
mechanism
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Squarks and Gluinos
The figure shows the ~q, ~g
mass reach for various
luminosities in the inclusive
ET + jets channel.
•SUSY could be discovered in
one good month of operation …
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Gluino reconstruction
~
pp  ~g  bb (26 %)
~
20 b
Event final state:
•  2 high pt isolated leptons OS
•  2 high pt b jets
• missing Et
(35 %)
~
10 l + l -
(0.2 %)
~+ ~0
l l  1 l + l - (60 %)
p
l
b
~
20
~g
~+
l
~
b
p
~
10
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+
b
UCSB could play a significant role here…
UCSB CMS Group January 20, 2003, J. Incandela
l
M. Chiorboli
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CMS Physics Reach
• Extra dimensions:
• LED: Sensitive to multi-TeV fundamental mass scale
• SED: Gravitons up to 1-2 TeV in some models
• And more.
• If Electroweak symmetry breaking proceeds via new strong
interactions something new has to show up
• New gauge bosons below a few TeV can be discovered
• If the true Planck scale is ~ 1 TeV, we may even create black holes
and observe them evaporate…
This is an outstanding program.
It requires unprecedented cost and effort.
It is not guaranteed…
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Our Responsibility
NEW:End Caps (TEC)
50% Modules for
Rings 5 and 6 and
hybrid processing for
Rings 2,5,6
2.4 m
Outer Barrel (TOB)
~105 m2
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Module Components
Pins
Front-End Hybrid
Kapton
cable
Pitch Adapter
Kapton-bias circuit
Carbon Fiber
Frame
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Silicon Sensors
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Rods & Wheels
1.2 m
UCSB CMS Group January 20, 2003, J. Incandela
0.9 m
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Sensors:
factories
Frames:
Brussels
Pitch adapter:
Brussels
Hybrids:
Strasbourg
Hybrid:
CF carrier
US and UCSB in
the CMS tracker
CERN
KSU
Sensor QAC
Module
assembly
Sub-assemblies
Wien
Bari
Padova Pisa Torino Bari
ROD INTEGRATION
FNAL
Perugia
Perugia
UCSB
FNAL
Bonding & FNAL UCSB
testing
Integration
into
mechanics
Pisa
UCSB
TIB-TID INTEGRATION
Pisa
Wien
Pisa
Louvain
PETALS INTEGRATION
Lyon
TECassembly
Aachen
TK ASSEMBLY
At CERN
Brussels UCSB
Zurich Strasbourg Karlsruhe Aachen
Brussels
TOB assembly TIB-ID assembly
At CERN
Lyon
Wien
Firenze
Louvain
Strasbourg
Karlsruhe
Strasbourg
Aachen
Karlsruhe
TECassembly
Karlsruhe. --> Lyon
UCSB carries
majority of US
production load
Active Group
• Fermilab (FNAL)
• L. Spiegel, S. Tkaczyk + technicians
• Kansas State University (KSU)
• T.Bolton, W.Kahl, R.Sidwell, N.Stanton
• University of California, Riverside (UCR)
• Gail Hanson, Gabriella Pasztor, Patrick Gartung
• University of California, Santa Barbara (UCSB)
• A. Affolder, A. Allen, D. Barge, S. Burke, D. Calahan, C.Campagnari, D. Hale,
(C. Hill), J.Incandela, S. Kyre, J. Lamb, C. McGuinness, D. Staszak, L. Simms,
J. Stoner, S. Stromberg, (D. Stuart), R. Taylor, D. White
• University of Illinois, Chicago (UIC)
• E. Chabalina, C. Gerber, T. T
• University of Kansas (KU)
• P. Baringer, A. Bean, L. Christofek, X. Zhao
• University of Rochester (UR)
• R.Demina, R. Eusebi, E. Halkiadakis, A. Hocker, S.Korjenevski, P.
Tipton
• Mexico:3 institutes led by Cinvestav Cuidad de Mexico
• 2 more groups are in the process of joining us
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Outer Barrel Production
• Outer Barrel
• Modules
• 4128 Axial (Installed)
• 1080 Stereo (Installed)
• Rods
• 508 Single-sided
• 180 Double-sided
• US Tasks  UCSB leadership
~20 cm
Modules Built & Tested at UCSB
(more in talk by Dean White)
• All hybrid bonding & test
• All Module assembly & test
• All Rod assembly & test
• Joint Responsibilities with CERN
• Installation & Commissioning
• Maintenance and Operation
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End Cap Construction
Module Built & Tested at UCSB
(more in talk by Dean White)
• Some Central European groups failed to produce TEC modules.
• TEC schedule was threatened.
• Central European Consortium requested US help
• We agreed to produce up to 2000 R5 and R6 modules
• After 10 weeks UCSB successfully built the R6 module seen above.
• We’re nearly ready to go on R5
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UCSB Production Leadership
• Gantry (robotic) module assembly
• Redesigned
• More robust, flexible, easily
maintained
• Surveying and QA
• Automated use of independent
system (OGP)
• More efficient, accurate, fail-safe
•Module Wirebonding
• Developed fully automated
wirebonding
• Faster and more reliable bonding
• Negligible damage or rework
•Taken together:
• Major increase in US capabilities
• Higher quality
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Testing & QA
4-Hybrid test stand and thermal cycler
(subject of talk by Lance Simms)
• UCSB the leader (cf. talk by A.Affolder)
• Testing macros and Test stand
configurations now used everywhere
• Critical contributions
• Discovered and played lead role in
solution of potentially fatal problems!
• Defective hybrid cables
• Vibration damage to module
wirebonds (cf. Talk Andrea Allen)
• Discovered a serious Common
Mode Noise problem and traced it
to ST sensors
• Other Important contributions;
• First to note faulty pipeline cells in
APVs
• Led to improved screening
•Taken together
• Averted disaster (financial, and
schedule)
• Higher quality
Improved testing
(see talk by Tony Affolder)
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Rods
• UCSB Efforts
• Building single rod test stands
for both UCSB and FNAL
• Designed and built module
installation tools (for CERN,
FNAL and UCSB)
• Will lead in the definition of
tests and test methods
• Production
• Will build and test half of the
688 rods (+10% spares) in the
TOB
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Summary
• CMS is designed to maximize LHC physics
• The tracker is one of the main strengths of CMS
• UCSB is making critical contributions
• Have proven to be essential to the success of the project
• Subsequent talks
• Details of the important aspects of the project and the important
achievements of the UCSB CMS group in the past year as presented
by the people responsible for them.
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Schedule of CMS Presentations
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Overview (25’) - Joe Incandela
Module Fabrication (20’) - Dean White
Electronic Testing (20’)– Tony Affolder
Rod Assembly and Testing (10’)– Jim Lamb
Wirebonding (10’)– Susanne Kyre
Database (10’)– Derek Barge
Hybrid Thermal and Electronic Testing (10’) – Lance Simms
OGP Surveying and Module Reinforcing (10’)– Andrea Allen
Schedule and Plans (10’) – Joe Incandela
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