1 / 33

CMS at UCSB

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 ?

syshe
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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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

  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 GeV What comes next ? • Supersymmetry ? • Is this what explains the galactic dark matter ? • Extra dimensions ? • Something completely unexpected? • Big questions nowadays require big machines…

  3. CERN Large Hadron Collider

  4. 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

  5. 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

  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

  7. Light SM Higgs Lepton id, b tagging and ET are crucial Difficult (or impossible) Energy resolution must be exceptional, tracking is crucial

  8. CMS Experiment at CERN Most Ambitious Elements:Calorimetry & Tracking

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. Efficiency, Purity, Resolution

  17. 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

  18. 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 …

  19. 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…

  20. 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…

  21. 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

  22. Module Components Front-End Hybrid Pins Kapton cable Pitch Adapter Kapton-bias circuit Carbon Fiber Frame Silicon Sensors

  23. Rods & Wheels 1.2 m 0.9 m

  24. 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

  25. 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

  26. 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)

  27. 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

  28. 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

  29. 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)

  30. 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

  31. 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

  32. 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

More Related