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CMS at UCSB Prof. J. Incandela US CMS Tracker Project Leader DOE Visit January 20, 2004

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CMS at UCSB. Prof. J. Incandela US CMS Tracker Project Leader DOE Visit January 20, 2004. Experimental Focus. Some of the questions LHC Experiments could resolve: What is the origin spontaneous symmetry breaking ? What sets the known energy scales ? - PowerPoint PPT Presentation

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Page 1: CMS at UCSB

CMS at UCSB

Prof. J. Incandela

US CMS Tracker Project Leader

DOE Visit

January 20, 2004

Page 2: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 2

Experimental Focus

• 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 GeVWhat comes next ?

• Supersymmetry ?

• Is this what explains the galactic dark matter ?

• Extra dimensions ?

• Something completely unexpected?

• Big questions nowadays require big machines…

Page 3: CMS at UCSB

CERN Large Hadron ColliderCERN Large Hadron Collider

Page 4: CMS at UCSB

CERN Large Hadron ColliderCERN 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

Page 5: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 5

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

Page 6: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 6

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

Page 7: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 7

Light SM Higgs

Lepton id, b tagging and ET are crucial

Energy resolution must be exceptional, tracking is crucial

Difficult (or impossible)

Page 8: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 8

CMS Experiment at CERN

Most Ambitious Elements:Calorimetry & Tracking

Page 9: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 9

CMS Inner Detector

• Inside of the 4 Tesla field of the largest SC Solenoid ever built• 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

Page 10: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 10

Page 11: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 11

Tracking

““Golden Golden Channel”Channel”

Efficient & robust Tracking

Fine granularity to resolve nearby tracksFast response time to resolve bunch crossingsRadiation resistant devices

Reconstruct high PT tracks and jets

~1-2% PT resolution at ~ 100GeV (’s)

Tag b jets

Asymptotic impact parameter d ~ 20m

Page 12: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 12

CMS Tracker

5.4 m

End Caps (TEC 1&2)

2,4

m

Inner Barrel & Disks

(TIB & TID)

PixelsOuter Barrel (TOB)

volume 24.4 m3

running temperature – 10 0C

Page 13: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 13

Pixels

Why Pixels ?• IP resolution

• Granularity

• Peak occupancy ~ 0.01 %

• Starting point for tracking

• Radiation tolerance

CMS Pixels• 45 million channels

• 100 m x 150 m pixel size

• Barrel: 4, 7 and 11 cm

• 2 (3) disks per end

Page 14: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 14

Silicon Strips

6 layers of 500 m sensorshigh resistivity, p-on-n

4 layers of 320 m sensorslow resistivity, p-on-n

Blue = double sided

Red = single sided

9+3 disks per end

Strip lengths range from Strip lengths range from 10 cm10 cm in the inner layers to in the inner layers to 20 cm20 cm in the outer layers. in the outer layers.

Strip pitches range from Strip pitches range from 8080mm in the inner layers to near in the inner layers to near 200200mm in the outer layers in the outer layers

Page 15: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 15

Some Tracker Numbers

• 6,136 Thin wafers 300 μm

• 19,632 Thick wafers 500 μm

• 6,136 Thin detectors (1 sensor)

• 9,816 Thick detectors (2 sensors)

• 3112 + 1512 Thin modules (ss +ds)

• 4776 + 2520 Thick modules (ss +ds)

• 10,016,768 individual strips and readout electronics channels

• 78,256 APV chips

• ~26,000,000 Bonds

• 470 m2 of silicon wafers

• 223 m2 of silicon sensors (175 m2 + 48 m2)

FE hybrid FE hybrid with FE with FE ASICSASICS

Pitch adapterPitch adapter

Silicon sensorsSilicon sensors

CF frameCF frame

Page 16: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 16

APV25

• 0.25 m 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

Page 17: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 17

Efficiency, Purity, Resolution

Page 18: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 18

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

Page 19: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 19

Squarks and Gluinos

•SUSY could be discovered in one good month of operation …

The figure shows the q, g mass reach for various luminosities in the inclusive ET + jets channel.

~ ~

Page 20: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 20

Gluino reconstruction

M. Chiorboli

~

p

p

g~

b~

b

b

l

l

01

~

02

~ l~

Event final state:• 2 high pt isolated leptons OS• 2 high pt b jets• missing Et

~ bb g pp

b~02

01

~

(26 %)

(35 %)

(0.2 %)

llll 01

~ ~

(60 %)

ll

UCSB could play a significant role here…

Page 21: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 21

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…

Page 22: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 22

Our Responsibility

5.4 m

2.4

m

Outer Barrel (TOB)

~105 m2

NEW:End Caps (TEC)

50% Modules for Rings 5 and 6 and

hybrid processing for Rings 2,5,6

Page 23: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 23

Module Components

Kapton-bias circuit

Carbon Fiber Frame Silicon Sensors

Front-End Hybrid

Pitch Adapter

Kapton cable

Pins

Page 24: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 24

Rods & Wheels

0.9 m1.2 m

Page 25: CMS at UCSB

ROD INTEGRATION

AachenKarlsruheStrasbourgZurichWien

PETALS INTEGRATION Aachen

Brussels Karlsruhe

Louvain

Lyon Strasbourg

BrusselsWien Lyon

TEC assemblyTEC assembly

CERN

Frames:

BrusselsSensors:factories

Hybrids:Strasbourg

Pitch adapter:Brussels

Hybrid:CF carrier

TK ASSEMBLYAt CERN

LouvainStrasbourg

Pisa Perugia Wien

BariPerugia

Bari FirenzeTorinoPisaPadova

TIB-TID INTEGRATION

FNAL

UCSB

TOB assembly TIB-ID assemblyAt CERN Pisa Aachen Karlsruhe. --> Lyon

Karlsruhe

Pisa

Sensor QAC

Moduleassembly

Bonding &testing

Sub-assemblies

FNAL

US and UCSB in the CMS tracker

Integrationinto mechanics

KSU

UCSB carries majority of US production load

FNAL UCSB

UCSB

UCSB

Page 26: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 26

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

Page 27: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 27

Outer Barrel Production

• Outer Barrel • Modules

• 4128 Axial (Installed)

• 1080 Stereo (Installed)

• Rods

• 508 Single-sided

• 180 Double-sided

• US Tasks UCSB leadership• All hybrid bonding & test

• All Module assembly & test

• All Rod assembly & test

• Joint Responsibilities with CERN• Installation & Commissioning

• Maintenance and Operation

~20 cm

Modules Built & Tested at UCSB(more in talk by Dean White)

Page 28: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 28

End Cap Construction

• 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

Module Built & Tested at UCSB (more in talk by Dean White)

Page 29: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 29

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

Page 30: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 30

Testing & QA

• 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

4-Hybrid test stand and thermal cycler (subject of talk by Lance Simms)

Improved testing (see talk by Tony Affolder)

Page 31: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 31

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

Page 32: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 32

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.

Page 33: CMS at UCSB

UCSB CMS Group January 20, 2003, J. Incandela 33

Schedule of CMS Presentations

• 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