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  • Title: 24 GHz microwave mode converter optimized for superconducting ECR ion source SECRAL.
    Author: Guo JW, Sun L, Niu XJ, Zhang XZ, Lu W, Zhang WH, Feng YC, Zhao HW.
    Journal: Rev Sci Instrum; 2016 Feb; 87(2):02A708. PubMed ID: 26931926.
    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.
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