Operation Environment

• Pair Background Hit Rate:
  

  R(mm)	Hit Rate (/mm2/train)
  25	3.6
  50	0.1
  75	0.01

  Silicon Strip Detector cannot be used

• Radiation:
  • Pair Background: 3.6*150(Hz)*10⁷(sec/year)=5.4*10¹¹/cm²/year
  • Neutron from the Beam Dump:
    Beam Power: 250GeV*0.7*10¹⁰*85bunch/train*150Hz=3.5MW
    Neutron Yield: O(10¹²)/kW
    Acceptance: 1/(4*pi*1km²)
    P*Y*A=3*10¹¹/cm²/year (disregarding target self shielding)