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PEBS - P ositron E lectron B alloon S pectrometer Detector Concept CERN, January 2009

PEBS - P ositron E lectron B alloon S pectrometer Detector Concept CERN, January 2009. Stefan Schael I. Physikalisches Institut B RWTH Aachen. PEBS Experiment. 1,6 m. improve the momentum resolution by a factor of 10 !. SRD. SRD. RICH. RICH.

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PEBS - P ositron E lectron B alloon S pectrometer Detector Concept CERN, January 2009

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  1. PEBS - Positron Electron Balloon Spectrometer Detector Concept CERN, January 2009 Stefan Schael I. Physikalisches Institut B RWTH Aachen

  2. PEBS Experiment 1,6 m improve the momentum resolution by a factor of 10 !

  3. SRD SRD RICH RICH

  4. Physic-Programm: • Positron – Spectrum 1 GeV - 700 GeV • Electron – Spectrum 1 GeV – 1000 GeV • B-Field: 0.7 Tesla • Superconducting magnet, 850 kg • Acceptance: 3000 cm2 sr • 6 Si-Inner-Tracker Planes (red), • single Point resolution 0.010 mm • 4 ScFi-Outer Tracker Planes (pink) • single Point resolution 0.050 mm • momentum resolution: • 20% @ 1000 GeV • 2 TRD‘s, each with 12 layers, • Proton Rejection 104 @ 100 GeV • Electron Efficiency 80% • 11 X0 ECAL, Weight 650 kg • Weight: 1700 kg 1.2 m 2.0 m PEBS-ECAL 0.86 m TRD 1 1.0 m TRD 2

  5. 80 cm long ladders !

  6. Inner Si Tracker Upper SciFi Tracker Upper SciFi Tracker Circle-Fit Inner Si Tracker: B=0.7 Tesla, L=1m, nLayer=6, σx=0.010 mm

  7. Inner Si Tracker Upper SciFi Tracker Upper SciFi Tracker Angle-Point - Measurement Inner Si Tracker: B=0.7 Tesla, Lin =1.0 m, nLayer=4, σin=0.010 mm Upper SciFi-Tracker: Lup=1.2 m, nLayer=4, σup=0.050 mm

  8. Inner Si Tracker Upper SciFi Tracker Upper SciFi Tracker Angle-Angle - Measurement Inner Si Tracker: B=0.7 Tesla, Lin =1.0 m, nLayer=4, σin =0.010 mm Upper SciFi-Tracker: Lup =1.2 m, nLayer=4, σout=0.050 mm Lower SciFi-Tracker: Ldown=1.2 m, nLayer=4, σout=0.050 mm

  9. Track-Fit Performance at P=100 GeV

  10. No correlation visible for Circle-Fit and Angle-Point measurement => take the weighted mean

  11. Magnet Top View, center of the coils

  12. Magnet Side View, center of the coils Coil Coil

  13. Z=2.2m L=1m z3 z2 z1 z [m]

  14. Electron-Efficiency 70%

  15. Proton Rejection: Ecal 103, E/P=10 + TRD

  16. Gas RICH • Physic-Programm: • Positron/Electron – Spectrum up to 200 GeV • He3/He4 for 1 GeV/n <= E/n <= 100 GeV/n • Be10/Be9 for 1 GeV/n <= E/n <= 100 GeV/n • Weight Budget for RICH 600 kg PEBS - RICH TRD 1 TRD 2 Aerogel RICH

  17. SRD • Physic-Programm: • Positron – Spectrum 1 GeV - 1500 GeV • Electron – Spectrum 1 GeV – 3000 GeV • U-TRD: 12 Layer upper TRD • Proton Rejection 36 Layer TRD • 5 104 @ 500 GeV • Electron Efficiency 70% • Weight 50 kg • Weight Budget for SRD (green) 400 kg • SRD Acceptance 100,000 cm2 sr U-TRD PEBS - SRD TRD 1 TRD 2

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