Abstract

We have constructed a bunched beam generator of polarized slow positrons, namely TOPPS-II ( Tokyo Metropolitan University Polarized Positron Beam System) using the magnetic transportation. The positrons emitted from 100 mCi 22 Na are implanted on the tungsten moderator of 6 μm thickness. Reemitted positrons, accelerated to 200 eV and guided with 100 G magnetic field of solenoid coils, are chopped to be 40 ns every 200 ns and bunched into 2 ns time width. In this paper, we present the results of the overall performance of TOPPS-II.

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