Radial Compression of an Antiproton Cloud for Production of Intense Antiproton Beams

Abstract

We report here the radial compression of a large number of antiprotons ($\sim 5\times {10}^5$) in a strong magnetic field under ultrahigh vacuum conditions by applying a rotating electric field. Compression without any resonant structures was demonstrated for a range of frequencies from the sideband frequency of 200 kHz to more than 1000 kHz. The radial compression achieved is a key technique for synthesizing and manipulating antihydrogen atoms and antiprotonic atoms.