Speaker
Description
Pulsed slow-positron beams enable atomic-scale characterisation of surface and near-surface microdefects, furnishing precise data on defect size, concentration and spatial distribution. This study establishes a high brightness, high time resolution pulsed slow positron platform based on a solid-neon moderator that incorporates two distinct pulsing technologies within a common magnetic transport line. The first approach employs an integrated three-stage pulsing unit—comprising a chopper, prebuncher, and buncher—to generate a pulsed slow-positron beam with a count rate of 13 000 cps and a time resolution of 187 ps. The second approach combines a Penning-trap accumulation scheme with a buncher to generate positron burst with 600 ps time resolution, and a dedicated 2048-channel array detector has been developed to accommodate the resulting high-intensity gamma bursts. Together, the two pulsed slow-positron beamlines established in this study provide a versatile, high-resolution probe for nanoscale surface and near-surface physics, while high-brightness positron bursts also hold definite significance for advancing antimatter research.
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