NLC - The Next Linear Collider Project Discussion Detector Multiplicities & Timing Requirements Warm vs.
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NLC - The Next Linear Collider Project Discussion Detector Multiplicities & Timing Requirements Warm vs. Cold Tom Markiewicz SLAC ALCPG SLAC 8 January 2004 NLC - The Next Linear Collider Project Backgrounds and IR Layouts TESLA-500 JLC/NLC-500 N 2.0 x 1010 0.75 x 1010 sx sy sz 550 nm 243 nm 5 nm 3 nm 300 mm 110 mm Incoherent production of e+e- pairs. – # pairs scales with luminosity and is ~equal for both designs. – Detector occupancies depend on machine bunch structure and relevant readout time – IR Designs are similar in the use of tungsten shielding, instrumented masks, and low Z material – GEANT and FLUKA based simulations indicated that in both cases occupancies are acceptable Tom Markiewicz NLC - The Next Linear Collider Project NLC/TESLA Beam-Beam Comparison NLC500 5re2 N e Bbunch TESLA500 6s Z (s X s Y ) Bc Dy 14 25 0.11 0.06 n 1.17 1.6 db 4.6% 3.2% HD 1.4 2.1 # pairs/bunch 49,000 130,000 larger luminosity enhancement <E>_pair e 4.1 GeV 2.8 GeV more sensitivity to jitter #pairs/ sec 1.1E9 1.8E9 #pairs/ Lum 5.5 fm2 5.3 fm2 2re N es Z DY sY (s X s Y ) Larger sz for TESLA More time for disruption Lower charge density lower energy photons Tom Markiewicz NLC - The Next Linear Collider Project Detector Occupancies from e+e- Pairs @ 500 GeV fcn(bunch structure, integration time) Detector VXD-L1 Per bunch 36E-3/mm2 T 3.1E-3/mm2 E VXD-L2 1336, 5trks S TPC L Barrel ECAL 1176, 0.63GeV A Endcap ECAL 1176, 1.29GeV VXD-L1 38E-3/mm2 3.1E-3/mm2 N VXD-L2 1377, ?trks L TPC C Barrel ECAL 547 , 0.73 GeV Endcap ECAL 597, 0.9 GeV R. O. Eff #B Occupancy Comment 50 ms 148 5.3/ mm2 1.5cm, 4T 250 ms 742 2.3/ mm2 2.6cm, 4T 55 ms 160 Few per mil 150 ns 1 0.63 GeV 101>3MeV 150 ns 1 1.29 GeV 91>3MeV 8 ms 192 7.2/ mm2 1.2cm, 3T 8 ms 192 0.6/ mm2 2.4cm, 3T 8 ms 192 “Few per mil” Needs Study 8 ms 192 139 GeV Needs Study 8 ms 192 171 GeV Needs Study TESLA=TDR; NLC=Snowmass 2001 Tom Markiewicz