Bunched beam generation of polarized positrons in TOPPS-II

We have constructed a bunched beam generator of polarized slow positrons, namely TOPPS-II Tokyo Metropolitan . 22 University Polarized Positron Beam System using the magnetic transportation. The positrons emitted from 100 mCi Na are implanted on the tungsten moderator of 6 mm 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. q1999 Published by Elsevier Science B.V. All rights reserved