title: The injection efficiency measurement and analysis for central region model cyclotron.
abstract: At the China Institute of Atomic Energy, a central region model cyclotron has been constructed, which is dedicated for various experimental verifications to study beam properties. The design features of the ion source and injection line have already been described in other papers. We shall report here the results of the initial beam tests. A wire scanner is employed in the injection line to measure beam transverse sizes and these data can be used to fit the phase plane parameters after the ion source. Based on the beam tests results, the ion source built in 2003 has been improved recently. The improvement is mainly due to the repair of the multicusp field. From the ion source to the exit of the inflector, a transmission efficiency of 93% has been obtained for a continuous and low current input beam. It is also described here the experimental arrangement and the results.
authors.affiliation: China Institute of Atomic Energy, Beijing 102413, People's Republic of China. yaohongjuan@gmail.com
authors.forename: Hongjuan
authors.initials: H
authors.lastname: Yao
authors.forename: Zhenguo
authors.initials: Z
authors.lastname: Li
authors.forename: Tao
authors.initials: T
authors.lastname: Ge
authors.forename: Longcheng
authors.initials: L
authors.lastname: Wu
authors.forename: Fengping
authors.initials: F
authors.lastname: Guan
authors.forename: Yinlong
authors.initials: Y
authors.lastname: Lv
authors.forename: Zhenhui
authors.initials: Z
authors.lastname: Wang
authors.forename: Gengshou
authors.initials: G
authors.lastname: Liu
authors.forename: Tianjue
authors.initials: T
authors.lastname: Zhang
authors.forename: Hongru
authors.initials: H
authors.lastname: Cai