Abstract
The yield of positrons as a function of drive beam energy for a K=1, planar undulator-based positron source is evaluated using the EGS4 simulation code. Raw yield, yield into a fixed phase space acceptance, and rms emittance of emitted positrons is calculated. For a fixed geometry, the yield varies as the square of the drive beam energy. A faster fall off at the low energy end is seen and is due to reduced emission of positrons produced with initially low energies (in the range of a few MeV). The yield of positrons as a function of drive beam energy for a K=1, planar undulator-based positron source is evaluated using the EGS4 simulation code. Raw yield, yield into a fixed phase space acceptance, and rms emittance of emitted positrons is calculated. For a fixed geometry, the yield varies as the square of the drive beam energy. A faster fall off at the low energy end is seen and is due to reduced emission of positrons produced with initially low energies (in the range of a few MeV).
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