Towards a 1 MW, 170 GHz gyrotron design for fusion application |
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| Institution: | 1. Ecole Polytechnique Fédérale de Lausanne, Swiss Plasma Center, CH-1015 Lausanne, Switzerland;2. Karlsruhe Institute of Technology, Institute for Applied Materials, D-76021 Karlsruhe, Germany;3. Fusion for Energy, Josep Pla 2, Torres Diagonal Litoral B3, E-08019 Barcelona, Spain;4. ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, France;1. Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan;2. ITER Organization, CS90 046, 13067 St. Paul lees Durance Cedex, France;1. Max Planck Institute for Plasmaphysics, Wendelsteinstrasse 1, DE-17491 Greifswald, Germany;2. IHM, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany;3. IHE, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany;4. See author list of R.C.Wolf Nucl.Fusion 57 (2017) 102020;1. Institute for Neutron Physics and Reactor Technology INR, Germany;2. Institute for Applied Materials IAM, Germany;3. Karlsruhe Institute of Technology KIT, Germany;1. Institute of Plasma Physics, Chinese Academy of Sciences, Shushanhu Road 350, Hefei, 230031, Anhui, China;2. University of Science and Technology of China, Jinzhai Road 96, Hefei, 230026, Anhui, China |
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| Abstract: | The electrical design of different components of 1 MW, 170 GHz gyrotron such as, magnetron injection gun, cylindrical interaction cavity and collector and RF window is presented in this article. Recently, a new project related to the development of 170 GHz, 1 MW gyrotron has been started for the Indian Tokamak. TE34,10 mode is selected as the operating mode after studied the problem of mode competition. The triode type geometry is selected for the design of magnetron injection gun (MIG) to achieve the required beam parameters. The maximum transverse velocity spread of 3.28% at the velocity ratio of 1.34 is obtained in simulations for a 40 A, 80 kV electron beam. The RF output power of more than 1 MW with 36.5% interaction efficiency without depressed collector is predicted by simulation in single-mode operation at 170 GHz frequency. The simulated single-stage depressed collector of the gyrotron predicted the overall device efficiencies >55%. Due to the very good thermal conductivity and very weak dependency of the dielectric parameters on temperature, PACVD diamond is selected for window design for the transmission of RF power. The in-house developed code MIGSYN and GCOMS are used for initial geometry design of MIG and mode selection respectively. Commercially available simulation tools MAGIC and ANSYS are used for beam–wave interaction and mechanical analysis respectively. |
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