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TY - UNPB AU - Guo, J.W. AU - Fang, X. AU - Feng, Y.C. AU - Li, L. B. AU - Li, L. X. AU - Lu, W. AU - Shen, Z. AU - Sun, L.T. AU - Zhang, W.H. AU - Zhang, X.Z. AU - Zhao, H.W. ED - Schaa, Volker RW ED - Pisciotta, Pietro TI - Perspective on High-Power Microwave Coupling in Gyrotron Frequency ECR Ion Sources J2 - Proc. of ECRIS2018, Catania, Italy, 10-14 September 2018 C1 - Catania, Italy T2 - International Workshop on ECR Ion Sources T3 - 23 LA - english AB - Better understanding of microwave power coupling is a key issue to enhance the performance of an ECR ion source in terms of higher ion beam intensity yield and critical in the design of the next generation ECRIS. For this reason, we investigated the impact on highly charged ion production using different microwave coupling modes and waveguide calibers with superconducting ECR Ion Source SECRAL, and some very encouraging results were obtained. Based on the comparison of ion source performance working at different coupling schemes, analytical studies on microwave power launching efficiency and the characteristics of electric field power distribution inside the ECRIS chamber have been made and some preliminary conclusions will be given in this paper. This paper will also provide a 45 GHz microwave solution for the next generation ECR ion source FECR (a Fourth generation ECR ion source). After off-line tests of microwave transmission efficiency and mode purity, the 45 GHz gyrotron microwave system has been commissioned with SECRAL-II (a superconducting ECR ion source optimized for 28 GHz operation), and some preliminary results have been achieved and will be given in this paper. PB - JACoW Publishing CP - Geneva, Switzerland ER -