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Beam pipe, FCAL, and BCAL

Beam pipe, FCAL, and BCAL. July 27 th , 2005 Y.Sugimoto. Design criteria. Z BCAL = 4.3m Z FCAL(Mask) = Z TPC = 2.3m EM shower debris should not hit TPC Tracks passing through FCAL should not go back to TPC

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Beam pipe, FCAL, and BCAL

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  1. Beam pipe, FCAL, and BCAL July 27th, 2005 Y.Sugimoto

  2. Design criteria • ZBCAL= 4.3m • ZFCAL(Mask) = ZTPC = 2.3m • EM shower debris should not hit TPC • Tracks passing through FCAL should not go back to TPC • In some options, back-scattered photon can go into TPC. If it turns out not acceptable by simulation studies, make ZFCAL(Mask) smaller. • Radii of beam pipe should be large enough not to be hit by pair background core

  3. Pair background Track density (cm/cm3/BX) Ebeam=250 GeV, B=3T

  4. BCAL hit Energy weighted hit distribution (GeV/mm2) • Nominal 2mrad • Ebeam=250 GeV • 1 BX • 3T

  5. BCAL hit Energy weighted hit distribution (GeV/mm2) • Low Q 2mrad • Ebeam=250 GeV • 1 BX • 3T

  6. BCAL hit Energy weighted hit distribution (GeV/mm2) • High L 20 mrad • Ebeam=250 GeV • 1 BX • 3T

  7. Back scattering to TPC

  8. Baseline design

  9. Baseline design • Z co-ordinate (fixed except for A) • A: 5cm • B: 25cm • C: 35cm • D: 110cm • E: 230cm • F: 260cm • G: 285cm • H: 320cm • I : 400cm • K: 405cm • L: 430cm • M: 450cm • R co-ordinate • Option dependent (See EXCEL file)

  10. Pre-Baseline design

  11. Pre-Baseline design • Z co-ordinate (fixed except for A) • A: 5cm • B: 25cm • C: 35cm • D: 110cm • E: 230cm • F: 260cm • G: 285cm • H: 320cm • I : 400cm • K: 405cm • L: 430cm • M: 450cm • R co-ordinate • Option dependent (See EXCEL file)

  12. Parameters (Baseline Design)

  13. Impact on detector design Baseline Design

  14. Impact on detector design Pre-Baseline Design

  15. Next step • Study 1 TeV case • Pair background to VTX, IT, FST • Need more statistics (x1000) • Back scattering to VTX, TPC • Full simulation • More statistics (x100) • BCAL performance study • Full simulation • More statistics (x100?)

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