title: Development of a compact filament-discharge multi-cusp H- ion source.
abstract: A 14 MeV medical cyclotron with the external ion source has been designed and is being constructed at China Institute of Atomic Energy. The H(-) ion will be accelerated by this machine and the proton beam will be extracted by carbon strippers in dual opposite direction. The compact multi-cusp H(-) ion source has been developed for the cyclotron. The 79.5 mm long ion source is 48 mm in diameter, which is consisting of a special shape filament, ten columns of permanent magnets providing a multi-cusp field, and a three-electrode extraction system. So far, the 3 mA∕25 keV H(-) beam with an emittance of 0.3 π mm mrad has been obtained from the ion source. The paper gives the design details and the beam test results. Further experimental study is under way and an extracted beam of 5 mA is expected.
authors.affiliation: China Institute of Atomic Energy, Beijing, China. jiaxl@ciae.ac.cn
authors.forename: XianLu
authors.initials: X
authors.lastname: Jia
authors.forename: TianJue
authors.initials: T
authors.lastname: Zhang
authors.forename: Xia
authors.initials: X
authors.lastname: Zheng
authors.forename: JiuChang
authors.initials: J
authors.lastname: Qin
mesh_terms: D017357:Cyclotrons; D006859:Hydrogen / Q000737:chemistry*; D016011:Normal Distribution; D049268:Positron-Emission Tomography; D011874:Radiometry / Q000295:instrumentation*
chemical_list: D006859:Hydrogen