Advanced spectroscopy experiments and new physics experiments with positronium atoms in vacuum will benefit from positronium production in an environment Crinkle Knives / Cutters free of magnetic and electrostatic fields.Here, we present a novel scheme for generating a bunched positron beam.The positron bunches are prebunched before extraction from a buffer-gas trap, nonadiabatically extracted from a 700 G magnetic field, energy elevated up to 20 kV, and bunched on a target in a free field.
According to simulations of the system, 60% of cooled positrons in the buffer-gas trap are extracted and focused on the target in a time spread of Queen Storage Bed 2.5 ns full width tenth maximum (FWTM) and a spot of about 4 mm FWTM for positron implantation energy higher than 3 keV.These performance numbers are achieved in the same apparatus through a combination of several innovative beam manipulations.