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GLC Detector Geometry

GLC Detector Geometry. Y. Sugimoto. Introduction. Figure of merit : Main Tracker. Figure of merit : Calorimeter s jet 2 = s ch 2 + s g 2 + s nh 2 + s confusion 2 + s threashold 2 Separation of charged particles and g /nh is important (See J.C. Brient’s talk at LCWS2004)

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GLC Detector Geometry

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  1. GLC Detector Geometry Y. Sugimoto

  2. Introduction • Figure of merit : Main Tracker

  3. Figure of merit : Calorimeter • sjet2 = sch2 + sg2 + snh2 + sconfusion2 + sthreashold2 • Separation of charged particles and g/nh is important (See J.C. Brient’s talk at LCWS2004) • Charged particles should be spread out by B field • Lateral size of EM shower of g should be as small as possible ( ~ Rmeffective: effective Moliere length) Barrel:B Rin2/Rmeffective Endcap: B Z2/Rmeffective Rin : Inner radius of Barrel ECAL Z : Z position of EC ECAL front face (Actually, it is not so simple. Even with B=0, photon energy inside a certain distance from a charged track scales as ~Rin2)

  4. Simulation by J.C. Brient e+e-  ZH  jets at Ecm=500GeV SD (6T) TESLA (4T)

  5. Effective Moliere Length xg xa Effective Molire Length = Rm(1+xg/xa) Gap : Sensor + R.O. elec + etc. Absorber W : Rm ~ 9mm Pb : Rm ~ 16mm

  6. B=0

  7. Comparison of Detector Models

  8. Comparison of Detector Models

  9. Possible modification of GLC Detector • Larger Rmax of the tracker and Rin of ECAL • Keep solenoid radius same:  Somewhat thinner CAL (but still 6l), but does it matter? • Use W/Sci(/Si) instead of Pb/Sci for ECAL • Effective Rm: 25.5mm  16.2mm (2.5mm W / 2.0mm Gap) • Much smaller segmentation by Si pad layers • Put ECCAL at larger Z  Longer Solenoid • Preferable for B-field uniformity if TPC is used • If l*=4.3 (3.5) m is adopted, • 10 cm thick W shield around the support tube is not necessary  Rmin of the tracker can be reduced • It is preferable Zpole-tip < l* both for neutron b.g. and QC support

  10. GLC B-field non-uniformity TESLA TDR Limit: mm R=0.1m TESLA TDR Limit Z (m) R=2.0m by H.Yamaoka

  11. Comparison of Detector Models

  12. Comparison of Detector Models

  13. EM Calorimeters • Area of EM CAL (Barrel + Endcap) • SD: ~40 m2 / layer • TESLA: ~80 m2 / layer • GLD: ~ 100 m2 / layer • (JLC: ~130 m2 / layer)

  14. Global Geometry

  15. Global Geometry

  16. Interaction Region

  17. Summary • The LC detector optimized for “Energy Flow Algorithm” is realized with a “Truly large detector” • “Truly large detector” can be achieved with a minimal modification of GLC detector, and it can get better performance than any other detector models. • Compared with the present GLC detector, • Rmin and Zmin of EM CAL should be increased • Effective Moliere length of ECAL should be decreased • Magnetic field and radius of the solenoid unchanged, but somewhat longer • For TESLA detector, it is hard to make Rmin of ECAL larger because of the cost of the Si/W EMCAL • The key is Calorimeter

  18. Summary (Cont.) • Things to do: • Design new (longer) solenoid magnet with better uniformity • TPC: Determine the requirement for the B-field uniformity • CAL: Simulations • Show the advantage of Large detector • 4 cm2 granularity is good enough for EFA? • If not, how many Si layers are necessary? • Consider tungsten (W) instead of lead (Pb) • Or still stick to hardware compensation rather than EFA? • How many l’s needed? • Collaboration with US LD: GLC+LD = GLD

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