RF calculation and thermal-stress analysis of the ECRH launcher on EAST tokamak |
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| Affiliation: | 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;1. University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands;2. Institute of Plasma Physics, Chinese Academy of Science (ASIPP), Hefei 230031, People''s Republic of China;3. ITER Organisation, route de Vinon sur Verdon, 13115 Saint Paul lez Durance, France;1. Karlsruhe Institute of Technology, Assoc. KIT-EURATOM, D-76021 Karlsruhe, Germany;2. Centre de Recherches en Physique des Plasmas, CRPP–EPFL, CH-1015 Lausanne, Switzerland;3. Istituto di Fisica del Plasma CNR, Euratom Association, 20125 Milano, Italy;4. FOM Institute DIFFER, P.O. Box 1207, 3430 BE Nieuwegein, Netherlands;5. Max-Planck-IPP, Euratom Association, D-85748 Garching, Germany;6. Institut für Plasmaforschung, IPF, D-70569 Stuttgart, Germany;7. Heemskerk Innovative Technology, Merelhof 2, 2172 HZ Sassenheim, Netherlands;8. Fusion for Energy, Barcelona, Spain;9. ITER Organization, 13108 Saint-Paul-lez-Durance, France;1. Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Caixa Postal 486, CEP 31270-901, Belo Horizonte, Minas Gerais, Brazil;2. Departamento de Botânica, Universidade Federal de Minas Gerais, Caixa Postal 486, CEP 31270-901, Belo Horizonte, Minas Gerais, Brazil |
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| Abstract: | EAST is a medium sized superconducting tokamak with major radius R = 1.8 m, minor radius a = 0.45 m, plasma current Ip ≤ 1 MA, toroidal field BT ≤ 3.5 T and expected plasma pulse length up to 1000 s. An electron cyclotron resonance heating (ECRH) launcher for four-beam injection is being installed on EAST tokamak. Four electron cyclotron wave beams which are generated from four sets of 140 GHz/1 MW/1000 s gyrotrons will be injected into the plasma by the spherical focusing mirrors and plane mobile mirrors. The focusing mirrors are spherical to focus Gaussian beams after reflection. Four plane mobile mirrors independently steer continuously in the poloidal and toroidal direction controlled by motors. With the suitable distance between mirrors and appropriate focal length of focusing mirror, the beam radius in the resonance layer of plasma is 31.145 mm. The heat from plasma radiation and metal losses is loaded on the mobile mirror. In order to decrease the temperature and thermal stress, the inner equivalent diameter of water channels is 8 mm and the suggested water velocity is 4 m/s. |
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| Keywords: | ECRH launcher Gaussian beam Thermal stress EAST |
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