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Title: Development of a magnetized coaxial plasma gun for compact toroid injection into the C-2 field-reversed configuration device

Abstract

A compact toroid (CT) injector was developed for the C-2 device, primarily for refueling of field-reversed configurations. The CTs are formed by a magnetized coaxial plasma gun (MCPG), which consists of coaxial cylindrical electrodes and a bias coil for creating a magnetic field. First, a plasma ring is generated by a discharge between the electrodes and is accelerated by Lorenz self-force. Then, the plasma ring is captured by an interlinkage flux (poloidal flux). Finally, the fully formed CT is ejected from the MCPG. The MCPG described herein has two gas injection ports that are arranged tangentially on the outer electrode. A tungsten-coated inner electrode has a head which can be replaced with a longer one to extend the length of the acceleration region for the CT. The developed MCPG has achieved supersonic CT velocities of ∼100 km/s. Plasma parameters for electron density, electron temperature, and the number of particles are ∼5 × 10{sup 21} m{sup −3}, ∼40 eV, and 0.5–1.0 × 10{sup 19}, respectively.

Authors:
; ;  [1]; ; ; ; ; ; ; ; ; ; ;  [2];  [2];  [3]
  1. College of Science and Technology, Nihon University, 1-8-14 Kanda, Chiyoda-ku, Tokyo 1018308 (Japan)
  2. Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22597944
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 5; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCELERATION; COMPACTS; CYLINDRICAL CONFIGURATION; ELECTRODES; ELECTRON DENSITY; ELECTRON TEMPERATURE; ELECTRONS; EQUIPMENT; FIELD-REVERSED THETA PINCH DEVICES; GAS INJECTION; INJECTION; LENGTH; MAGNETIC FIELDS; PARTICLES; PLASMA GUNS; PLASMA RINGS; TUNGSTEN

Citation Formats

Matsumoto, T., E-mail: cstd14003@g.nihon-u.ac.jp, Sekiguchi, J., Asai, T., Gota, H., Garate, E., Allfrey, I., Valentine, T., Morehouse, M., Roche, T., Kinley, J., Aefsky, S., Cordero, M., Waggoner, W., Binderbauer, M., Tajima, T., and Department of Physics and Astronomy, University of California, Irvine, California 92697. Development of a magnetized coaxial plasma gun for compact toroid injection into the C-2 field-reversed configuration device. United States: N. p., 2016. Web. doi:10.1063/1.4952581.
Matsumoto, T., E-mail: cstd14003@g.nihon-u.ac.jp, Sekiguchi, J., Asai, T., Gota, H., Garate, E., Allfrey, I., Valentine, T., Morehouse, M., Roche, T., Kinley, J., Aefsky, S., Cordero, M., Waggoner, W., Binderbauer, M., Tajima, T., & Department of Physics and Astronomy, University of California, Irvine, California 92697. Development of a magnetized coaxial plasma gun for compact toroid injection into the C-2 field-reversed configuration device. United States. doi:10.1063/1.4952581.
Matsumoto, T., E-mail: cstd14003@g.nihon-u.ac.jp, Sekiguchi, J., Asai, T., Gota, H., Garate, E., Allfrey, I., Valentine, T., Morehouse, M., Roche, T., Kinley, J., Aefsky, S., Cordero, M., Waggoner, W., Binderbauer, M., Tajima, T., and Department of Physics and Astronomy, University of California, Irvine, California 92697. Sun . "Development of a magnetized coaxial plasma gun for compact toroid injection into the C-2 field-reversed configuration device". United States. doi:10.1063/1.4952581.
@article{osti_22597944,
title = {Development of a magnetized coaxial plasma gun for compact toroid injection into the C-2 field-reversed configuration device},
author = {Matsumoto, T., E-mail: cstd14003@g.nihon-u.ac.jp and Sekiguchi, J. and Asai, T. and Gota, H. and Garate, E. and Allfrey, I. and Valentine, T. and Morehouse, M. and Roche, T. and Kinley, J. and Aefsky, S. and Cordero, M. and Waggoner, W. and Binderbauer, M. and Tajima, T. and Department of Physics and Astronomy, University of California, Irvine, California 92697},
abstractNote = {A compact toroid (CT) injector was developed for the C-2 device, primarily for refueling of field-reversed configurations. The CTs are formed by a magnetized coaxial plasma gun (MCPG), which consists of coaxial cylindrical electrodes and a bias coil for creating a magnetic field. First, a plasma ring is generated by a discharge between the electrodes and is accelerated by Lorenz self-force. Then, the plasma ring is captured by an interlinkage flux (poloidal flux). Finally, the fully formed CT is ejected from the MCPG. The MCPG described herein has two gas injection ports that are arranged tangentially on the outer electrode. A tungsten-coated inner electrode has a head which can be replaced with a longer one to extend the length of the acceleration region for the CT. The developed MCPG has achieved supersonic CT velocities of ∼100 km/s. Plasma parameters for electron density, electron temperature, and the number of particles are ∼5 × 10{sup 21} m{sup −3}, ∼40 eV, and 0.5–1.0 × 10{sup 19}, respectively.},
doi = {10.1063/1.4952581},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 5,
volume = 87,
place = {United States},
year = {2016},
month = {5}
}