Creation of a monoenergetic pulsed positron beam

Abstract

We have developed a versatile, pulsed source of cold (ΔE=0.018 eV), low-energy positrons (E≈0–9 eV). Multiple pulses of 105 positrons, each 10 μs in duration, are extracted from a thermalized, room temperature positron plasma stored in a Penning trap. The frequency, duration, and amplitude of the pulses can be varied over a wide range.