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A repetitive pellet injection system for steady state fuelling in EAST superconducting tokamak
Affiliation:1. Institute of Plasma Physics, P.O. Box 1126, Hefei 230031, China;2. PELIN, LLC, 27A, Gzhatskaya, Saint Petersburg 195220, Russia;1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China;2. Princeton University, Plasma Physics Laboratory, Princeton, NJ 08543, USA;1. Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;2. Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany;3. Association EURATOM-Ö AW/ATI, Atominstitut, TU Wien, 1020 Vienna, Austria;4. Culham Centre for Fusion Energy, Culham Science Centre, Oxfordshire OX14 3DB, UK;5. CEA, IRFM, 13108 Saint-Paul-lez-Durance, France;6. EFDA, Garching, Germany;1. National Fusion Research Institute, Daejeon 305-333, Republic of Korea;2. Department of Electrical Engineering, HanYang University, Seoul 133-791, Republic of Korea;3. Department of Accelerator and Nuclear Fusion Physics and Engineering, University of Science and Technology, Daejeon 305-333, Republic of Korea;1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;2. Princeton Plasma Physics Laboratory, MS-27 P.O. Box 451, Princeton, NJ 08543, USA;1. Max-Planck-Insitut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;2. EUROfusion Consortium, PPPT, 85748 Garching, Germany;3. Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany;4. ENEA, C.R. Frascati, Via E. Fermi 45, 00044 Frascati (Rome), Italy;5. CEA, IRFM, 13108 Saint-Paul-lez-Durance Cedex, France;1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;2. University of Science and Technology of China, Hefei 230031, China;3. Princeton Plasma Physics Laboratory, Princeton, NJ, USA;4. CAS key Laboratory of Photovoltaic and Energy Conservation Materials, Hefei 230031, China
Abstract:A new hydrogen/deuterium pellet injector has been developed for Experimental Advanced Superconducting Tokamak (EAST). The pellet injector based on a screw extruder is able to fire pellets (?2 mm × 2 mm; frequency 1–10 Hz and velocity 150–300 m/s) in steady state mode with reliability greater than 95%. An injection line was designed for pumping propellant gas and for diagnostic purpose also. A guide tube for magnetic high-field side (HFS) injection was developed and theoretical calculation has been done. After successful engineering commissioning, the injection system served at EAST 2012 campaign and first experimental results were obtained.
Keywords:Pellet injector  High-field side  EAST
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