Cms at ucsb
This presentation is the property of its rightful owner.
Sponsored Links
1 / 33

CMS at UCSB PowerPoint PPT Presentation


  • 52 Views
  • Uploaded on
  • Presentation posted in: General

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 ?

Download Presentation

CMS at UCSB

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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 collider

    CERN Large Hadron Collider


    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


    Efficiency purity resolution

    Efficiency, Purity, Resolution


    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


    Cms at ucsb

    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)


    Cms at ucsb

    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


  • Login