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

Hiroyuki HIGAKI, Koji MICHISHIO¹⁾, Akira ISHIDA²⁾ and Nagayasu OSHIMA¹⁾

Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan

1)

National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan

2)

Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan

(Received 15 December 2022 / Accepted 28 February 2023 / Published 27 April 2023)

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.

Copyright (c) 2023 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

low energy positron beam, beam bunching, beam focusing, low energy positron plasma, electron-positron plasma

DOI: 10.1585/pfr.18.1406023

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