title: 36-segmented high magnetic field hexapole magnets for electron cyclotron resonance ion source.
abstract: Two high magnetic field hexapoles for electron cyclotron resonance ion source (ECRIS) have successfully fabricated to provide sufficient radial magnetic confinement to the ECR plasma. The highest magnetic field at the inner pole tip of one of the magnets exceeds 1.5 T, with the inner diameter (i.d.)=74 mm. The other hexapole magnet provides more than 1.35 T magnetic field at the inner pole tip, and the i.d. is 84 mm. In this article, we discuss the necessity to have a good radial magnetic field confinement and the importance of a Halbach hexapole to a high performance ECRIS. The way to design a high magnetic field Halbach structure hexapole and one possible solution to the self-demagnetization problem are both discussed. Based on the above discussions, two high magnetic field hexapoles have been fabricated to be utilized on two high performance ECRISs in Lanzhou. The preliminary results obtained from the two ECR ion sources are given.
authors.affiliation: Institute of Modern Physics, The Chinese Academy of Sciences, 730000 Lanzhou, China. sunlt@impcas.ac.cn
authors.forename: L T
authors.initials: LT
authors.lastname: Sun
authors.forename: H W
authors.initials: HW
authors.lastname: Zhao
authors.forename: Z M
authors.initials: ZM
authors.lastname: Zhang
authors.forename: H
authors.initials: H
authors.lastname: Wang
authors.forename: B H
authors.initials: BH
authors.lastname: Ma
authors.forename: X Z
authors.initials: XZ
authors.lastname: Zhang
authors.forename: X X
authors.initials: XX
authors.lastname: Li
authors.forename: Y C
authors.initials: YC
authors.lastname: Feng
authors.forename: J Y
authors.initials: JY
authors.lastname: Li
authors.forename: X H
authors.initials: XH
authors.lastname: Guo
authors.forename: Y
authors.initials: Y
authors.lastname: Shang
authors.forename: H Y
authors.initials: HY
authors.lastname: Zhao
mesh_terms: D017357:Cyclotrons / Q000295:instrumentation*; D004574:Electromagnetic Fields; D004583:Electrons; D004867:Equipment Design; D019544:Equipment Failure Analysis; D020450:Heavy Ions; D008280:Magnetics / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity