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Status of the Silicon Strip Detector at CMS

Status of the Silicon Strip Detector at CMS. INSTR08 Novosibirsk, Feb08. Hans Jürgen Simonis Universität Karlsruhe On behalf of the CMS-Tracker Collaboration. CMS -- C ompact M uon S olenoid. The CMS Si-Strip Tracker. What is in this box?. Size: 6m x 2.5m.

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Status of the Silicon Strip Detector at CMS

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  1. Status of the Silicon Strip Detector at CMS INSTR08 Novosibirsk, Feb08 Hans Jürgen Simonis Universität Karlsruhe On behalf of the CMS-Tracker Collaboration H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  2. CMS -- Compact Muon Solenoid H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  3. The CMS Si-Strip Tracker What is in this box? Size: 6m x 2.5m 200 m2 of active Silicon 15.100 Si Modules 75.000 APV FE chips 9.6 M readout channels 26 M wirebonds 37.000 Optical links (status september 07) required temperature: –10 °C on the Silicon surface H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  4. The Tracker Constituentshow is it organized? hermetically closed system tracking combines to outer Muon system resolution of pt ~1.5% at 100GeV TOB (Tracker Outer Barrel) 6 layers 5200 modules r (mm) SS Modules red DS Modules blue(100 mrad stereo angle) h Beam IP z (mm) TIB (Tracker Inner Barrel) 4 layers 2700 modules TID (Tracker Inner Disks) 2x3 disks 800 modules TEC (Tracker EndCap) 2x9 disks 6400 modules H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  5. Tracker Production: Modules TOB TEC 2700 TIB Modules 768 strips/sensor TIB TID 6400 TEC Modules 800 TID Modules 10 different geometries 5200 TOB Modules example: „stereo“-type 512 strips/sensor R2 R3 R1 R4 R6 R5 R7 H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  6. Tracker Production: TID TID we have 2 TIDs (z+ / z-) with 3 disks each each disk consists of 3 rings of modules each ring is mounted on a carbon fiber annulus The free space between modules is covered with overlapping modules on the backside. Modules are directly mounted on the cooling pipes. one TID ready for mounting to TIB H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  7. Tracker Production: TIB TIB The Inner Barrel consists of 4 layers of modules (“shells”) at radii: (20 cm < r < 55 cm) The 2 inner shells are equipped with double modules (stereo) Each shell is produced in 4 large pieces: “half-shells” (2 for z+ and 2 for z-) Modules are mounted with overlap in . (surface tilted wrt tangent) Modules on inner and outer surface overlap in z. Starting from shell-4, shells 3 - 2 - 1 are sequentially slid into the volume. shell: 4 3 2 Half of the TIB seen as a Matrjoschka (матрёшка) handling of components „on-shell“ is a delicate procedure H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  8. Tracker Production: TOB TOB The Outer Barrel spans the region (55 cm < r < 116 cm) with 6 layers Again, the 2 inner layers consist of double modules (stereo) A large CF support structure is loaded with 688 “rods” as sophisticated substructures The concept of rods (8 different types) allowed a distributed production scheme Rod-genesis: frame + interconnectboard + 6(12) modules The 2 outer layers were the first to be equipped with rods H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  9. Tracker Production: TEC TEC The 2 Endcaps consist of 9 Disks each Wedge-shaped modules form 7 concentric rings with all strips pointing to the beam axis Rings 1,2 and 5 have double modules („stereo“-rings) „Petals“ represent the substructures which allow for distributed production A fully equipped Endcap The 16 Petals of Disk-1 can nicely be seen we have 288 Petals of 8 different types, equipped with 19-27 modules H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  10. Tracker Production: Just plug everything together The support tube carries all the tracker elements and serves as thermal shield (with active cooling) towards the ECAL: -15º inside; +18º outside The assembly took place in a large clean room (TIF) where all aspects of system tests could be performed Tracker ready for transportation to CMS site, 20 km from CERN H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  11. FE-APV: Factory IC,RAL Control ASICS: Factory Company (QA) CF plates: FactoryBrussels Frames: Brussels,Pisa, Pakistan Sensors: CF cutting Factory CF cutting Factory Factories CERN Perugia Pisa UCSB FNAL HH Kapton: FactoryAachen, Bari Hybrids: Pitch adapter: Factories Brussels Factory-Strasbourg Louvain Strasbourg Firenze Vienna Sensor QAC Karlsruhe Module assembly Perugia Bari Lyon UCSB Brussels Vienna FNAL Bonding & testing Vienna Zurich Strasbourg Karlsruhe Aachen Padova Pisa Torino Bari Firenze Integration into mechanics ROD INTEGRATION TIB - TID INTEGRATION PETALS INTEGRATION Louvain Aachen Florence Pisa Torino FNAL UCSB Hamburg Strasbourg Brussels Karlsruhe TOB assembly TIB/TID assembly TEC assembly TEC assembly Sub-assemblies CERN Pisa Aachen Lyon@CERN TK ASSEMBLY Move to Pit and Insert CERN TIF H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  12. Cosmics in the TIF – (Tracker slice test) (summer 2007, on surface, without magnetic field) already large (~15%) Tracker System • only Silicon Strip Tracker involved • 2161 modules – 24,75 m² active area • measurements at different temperatures down to -15°C • trigger rate 6.5 Hz ; 4.5 M events H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  13. Signal to Noise TOB TIB noise [e-] 800 1000 1200 TEC TID 10 14 18 Strip length [cm] noise charge versus strip length; all TOB and TEC geometries Average value: S/N~30 for all subsystems H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  14. Tracking in TIF cosmics are rather different than pp-collisions • special tracking algorithm has been developed • module orientation not ideal (especially TEC and TID) preliminary 1.04 1.00 0.96 0.92 ▼Data ▲Simulation TOB efficiency given a TIB track Efficiency 1.2 1.3 1.4 1.5  1.04 1.00 0.96 0.92 comparison of measured conditional track reconstruction efficiencies (TIB/TOB) with simulations TIB efficiency given a TOB track 1.2 1.3 1.4 1.5  polar angle H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  15. Status: Tracker insertion 16.12.2007 H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  16. Installation Status Z- ; 25 Feb.2008 • Lots of • Connections: • 980 pipes • 3347 fibers • 2330 cables -4 -7 -6 p -8 Z- -3 w -9 -2 w • Sequence: • Barrel fibres • Pipe connection • Pipe insulation • Barrel cables • TEC fibres • TEC cables -18 -11 p p w -17 W -12 -13 -16 = partially done p report from M. Eppard -15 -14 = in work w H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  17. Status Feb.25 • Tracker is in final position inside CMS with an accuracy of 1mm • Fibers for Barrel, and almost all cooling pipes are connected • Services for Endcap are the last to be finished • Beampipe installation foreseen mid-April • BUT! CMS-closure test interferes with Tracker progress (in May) • Cosmic Runs (CRAFT) are foreseen until first beam (June/July 2008) H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  18. About Detector upgrade (SLHC) (our silicon tracker will be dead after 10 years of LHC operation) The upgrade of the LHC machine cannot be in energy, but in luminosity: 1034 1035 [p / s • cm2] The way how to reach that is not yet clear (12.5ns, 25ns, 50ns bunches, …) Higher occupancy ~10000 tracks per bunch crossing!  we need shorter strips  more electronic channels  more power required but: tracker material budget is already at its limits studies on new supply schemes have started (cooling; DC-DC-converters etc) 1035 1034 LHC: ~20 soft interactions superimposed on interesting event ( --> 1000 tracks/bc) SLHC: ~90 soft interactions superimposed on interesting event (could be ~200 or even 400; depending on bunchstructure) H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  19. TOB TOB TIB TIB PD PD About Detector upgrade (II) Higher irradiation Dose  In inner region (r <~ 40 cm) we need new rad-hard sensor-material  see RD50 activities (->Talk from G. Casse after lunch) In the outer region existing material (p-in-n float zone) can possibly be used. n-in-p and / or Magnetic Czochralski are in discussion But most challenging is the requirement that the SCMS-tracker has to contribute to the L1-trigger (detect high pt-tracks)  we need a new Tracker design several layouts are discussed: Extra pixel layer, bigger pixels, long pixels/short strips, & 1-2 triggering layers - J. Nash 3 Super-layers of stacked doublets - M. Mannelli H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  20. 16. December 2007: Tracker in CMS H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  21. Backup Material H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  22. Silicon Sensors p-in-n type silicon <100> – orientation 1.5 – 3.2 kΩcm resistivity; 320 µm thickness 4.0 – 8.0 kΩcm resistivity; 500 µm thickness Bias Voltage H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  23. The Readout scheme amplify, shape and store Data branch Control branch (clock, trigger, …) A Readout-hybrid with 4 APV chips H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  24. The Material budget the contribution of different constituents is color-coded: support cooling cables H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  25. Scint. Conf. B, Room Temp Scints Conf. C, Room Temp 10° 0° -10° -15° Signal / Noise for the different Tracker elements at various temperatures corrected for incident angle TIB → StoN ~ 27; TOB → StoN ~ 31; TEC → StoN ~ 31 H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  26. MTCC – MagnetTest and Cosmic Challenge(summer 2006, still in surface hall) small Tracker system within CMS-Magnet • all CMS-subsystems involved (incl. ECAL, HCAL, Myon-System) for Tracker: • 1% of electronic channels (~105) connected • 133 modules in total ( 0.75 m2 Si area) • 25 M events at different magnetic field values up to 3.8T • check of noise behavior • check software (readout, data handling, tracking algorithms) 4 TOB rods 2 TIB segments 2 TEC petals H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

  27. Petal assembly H.J.Simonis, CMS Collaboration, Novosibirsk Feb.08

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