Requirement for the LEPS detector system

• DAQ

  • 1 kHz trigger rate and various front end

• LEP intensity

  • 107 photon/sec, yield of f 1.72x10-2/sec with 0.1 radiation length target

• Mass resolution (f from CH2)

  • Gamma energy resolution with tagging method to 15 MeV
  • Spatial resolution of the drift chamber 200 mm

• X-ray shielding

  • Tagging counter
  • Drift chamber

• Particle ID

  • Timing resolution of TOF 100 psec for 4s separation of K/p/e at 2 GeV/c

106 photon /sec and from only proton

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