The Buncher and the Magnetic Lens for the LINAC Based Low Energy Positron Beams at AIST

Abstract

A buncher and a magnetic lens were introduced to improve the beam flux density of a pulsed positron beam extracted from the low energy positron accumulator at National Institute of Advanced Industrial Science and Technology (AIST). The buncher made the pulse width ~ 1/4 and the magnetic lens reduced the beam cross section ~ 1/9, which resulted in about 36 times increase in the beam flux density. Possible applications for electron-positron plasma experiments are also discussed.