title: 24 GHz microwave mode converter optimized for superconducting ECR ion source SECRAL.
abstract: Over-sized round waveguide with a diameter about Ø33.0 mm excited in the TE01 mode has been widely adopted for microwave transmission and coupling to the ECR (Electron Cyclotron Resonance) plasma with the superconducting ECR ion sources operating at 24 or 28 GHz, such as SECRAL and VENUS. In order to study the impact of different microwave modes on ECRH (Electron Cyclotron Resonance Heating) efficiency and especially the production of highly charged ions, a set of compact and efficient TE01-HE11 mode conversion and coupling system applicable to 24 GHz SECRAL whose overall length is 330 mm has been designed, fabricated and tested. Good agreements between off-line tests and calculation results have been achieved, which indicates the TE01-HE11 converter meets the application design. The detailed results of the optimized coupling system will be presented in the paper.
authors.affiliation: Institute of Modern Physics (IMP), Chinese Academy of Science, Lanzhou 730000, China.
authors.forename: J W
authors.initials: JW
authors.lastname: Guo
authors.affiliation: Institute of Modern Physics (IMP), Chinese Academy of Science, Lanzhou 730000, China.
authors.forename: L
authors.initials: L
authors.lastname: Sun
authors.affiliation: University of Electronic Science and Technology of China, Chengdu 610054, China.
authors.forename: X J
authors.initials: XJ
authors.lastname: Niu
authors.affiliation: Institute of Modern Physics (IMP), Chinese Academy of Science, Lanzhou 730000, China.
authors.forename: X Z
authors.initials: XZ
authors.lastname: Zhang
authors.affiliation: Institute of Modern Physics (IMP), Chinese Academy of Science, Lanzhou 730000, China.
authors.forename: W
authors.initials: W
authors.lastname: Lu
authors.affiliation: Institute of Modern Physics (IMP), Chinese Academy of Science, Lanzhou 730000, China.
authors.forename: W H
authors.initials: WH
authors.lastname: Zhang
authors.affiliation: Institute of Modern Physics (IMP), Chinese Academy of Science, Lanzhou 730000, China.
authors.forename: Y C
authors.initials: YC
authors.lastname: Feng
authors.affiliation: Institute of Modern Physics (IMP), Chinese Academy of Science, Lanzhou 730000, China.
authors.forename: H W
authors.initials: HW
authors.lastname: Zhao