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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 ?

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cms at ucsb
CMS at UCSB

Prof. J. Incandela

US CMS Tracker Project Leader

DOE Visit

January 20, 2004

experimental focus
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 GeV

What comes next ?

      • Supersymmetry ?
        • Is this what explains the galactic dark matter ?
      • Extra dimensions ?
      • Something completely unexpected?
  • Big questions nowadays require big machines…
cern large hadron collider1
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

CERN Large Hadron Collider
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

Challenge and Reward
sm higgs at the lhc
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

light sm higgs
Light SM Higgs

Lepton id, b tagging and ET are crucial

Difficult (or impossible)

Energy resolution must be exceptional, tracking is crucial

cms experiment at cern
CMS Experiment at CERN

Most Ambitious Elements:Calorimetry & Tracking

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

CMS Inner Detector
tracking
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
cms tracker
CMS Tracker

Outer Barrel (TOB)

Pixels

End Caps (TEC 1&2)

Inner Barrel & Disks

(TIB & TID)

2,4 m

5.4 m

volume 24.4 m3

running temperature – 10 0C

pixels
Why Pixels ?

IP resolution

Granularity

Peak occupancy ~ 0.01 %

Starting point for tracking

Radiation tolerance

Pixels
  • CMS Pixels
    • 45 million channels
      • 100 mm x 150 mm pixel size
    • Barrel: 4, 7 and 11 cm
    • 2 (3) disks per end
silicon strips
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

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)

Some Tracker Numbers

Silicon sensors

CF frame

Pitch adapter

FE hybrid with FE ASICS

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

APV25
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

CMS Physics Reach
squarks and gluinos
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 …
gluino reconstruction
Gluino reconstruction

~

(26 %)

p

p

g

b

b

(35 %)

~

(0.2 %)

c

0

1

~

~

(60 %)

0

-

+

+

-

c

l

l

l

l

1

+

-

l

l

p

-

l

b

~

+

l

+

l

b

p

~

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

M. Chiorboli

UCSB could play a significant role here…

cms physics reach1
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…

CMS Physics Reach

This is an outstanding program.

It requires unprecedented cost and effort.

It is not guaranteed…

our responsibility
Our Responsibility

NEW:End Caps (TEC)

50% Modules for Rings 5 and 6 and hybrid processing for Rings 2,5,6

Outer Barrel (TOB)

~105 m2

2.4 m

5.4 m

module components
Module Components

Front-End Hybrid

Pins

Kapton cable

Pitch Adapter

Kapton-bias circuit

Carbon Fiber Frame

Silicon Sensors

rods wheels
Rods & Wheels

1.2 m

0.9 m

slide25
Pisa

UCSB

Brussels

FNAL

UCSB

Sensors:

Pitch adapter:

Frames:

Hybrid:

Hybrids:

factories

Brussels

Brussels

CF carrier

Strasbourg

US and UCSB in the CMS tracker

CERN

Perugia

Wien

Louvain

KSU

Sensor QAC

Karlsruhe

Strasbourg

Module

assembly

Perugia

Bari

Lyon

UCSB

Wien

FNAL

Bonding &

testing

Wien

Zurich

Strasbourg

Karlsruhe

Aachen

Padova

Pisa

Torino

Bari

Firenze

Integration

into

mechanics

ROD INTEGRATION

TIB

-

TID INTEGRATION

PETALS INTEGRATION

Aachen

Louvain

Lyon

Strasbourg

Karlsruhe

Pisa

FNAL

Brussels

UCSB

TOB

assembly

TIB

-

ID

assembly

TEC

assembly

TEC

assembly

Sub-assemblies

At CERN

Pisa

Aachen

Karlsruhe

.

--

> Lyon

UCSB carries majority of US production load

TK ASSEMBLY

At CERN

active group
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
outer barrel production
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)

end cap construction
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
ucsb production leadership
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
testing qa
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)

slide31
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
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.

Summary
schedule of cms presentations
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
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