title: Key elements of space charge compensation on a low energy high intensity beam injector.
abstract: Space charge effect (SCE) along the beam line will decrease beam quality. Space charge compensation (SCC) with extra gas injection is a high-efficiency method to reduce SCE. In this paper, we will report the experimental results on the beam profile, potential distribution, beam emittance, and beam transmission efficiency of a 35 keV∕90 mA H(+) beam and a 40 keV∕10 mA He(+) beam compensated by Ar∕Kr. The influence of gas type, gas flow, and injection location will be discussed. Emphasis is laid on the consideration of SCC when designing and commissioning a high intensity ion beam injector. Based on measured data, a new definition of space charge compensation degree is proposed.
authors.affiliation: Institution of Nuclear Science and Technology, State Key Laboratory of Nuclear Physics and Technology, Institute of Heavy Ion Physics, Peking University, Beijing 100871, China. sxpeng@pku.edu.cn
authors.forename: Shixiang
authors.initials: S
authors.lastname: Peng
authors.forename: Pengnan
authors.initials: P
authors.lastname: Lu
authors.forename: Haitao
authors.initials: H
authors.lastname: Ren
authors.forename: Jie
authors.initials: J
authors.lastname: Zhao
authors.forename: Jia
authors.initials: J
authors.lastname: Chen
authors.forename: Yuan
authors.initials: Y
authors.lastname: Xu
authors.forename: Zhiyu
authors.initials: Z
authors.lastname: Guo
authors.forename: Jia'er
authors.initials: J
authors.lastname: Chen
authors.forename: Hongwei
authors.initials: H
authors.lastname: Zhao
authors.forename: Liangting
authors.initials: L
authors.lastname: Sun