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(21) m(-3), ∼40 eV, and 0.5-1.0 × 10(19), respectively.
authors.affiliation: College of Science and Technology, Nihon University, 1-8-14 Kanda, Chiyoda-ku, Tokyo 1018308, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Matsumoto
authors.affiliation: College of Science and Technology, Nihon University, 1-8-14 Kanda, Chiyoda-ku, Tokyo 1018308, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Sekiguchi
authors.affiliation: College of Science and Technology, Nihon University, 1-8-14 Kanda, Chiyoda-ku, Tokyo 1018308, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Asai
authors.affiliation: Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688, USA.
authors.forename: H
authors.initials: H
authors.lastname: Gota
authors.affiliation: Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688, USA.
authors.forename: E
authors.initials: E
authors.lastname: Garate
authors.affiliation: Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688, USA.
authors.forename: I
authors.initials: I
authors.lastname: Allfrey
authors.affiliation: Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688, USA.
authors.forename: T
authors.initials: T
authors.lastname: Valentine
authors.affiliation: Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688, USA.
authors.forename: M
authors.initials: M
authors.lastname: Morehouse
authors.affiliation: Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688, USA.
authors.forename: T
authors.initials: T
authors.lastname: Roche
authors.affiliation: Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688, USA.
authors.forename: J
authors.initials: J
authors.lastname: Kinley
authors.affiliation: Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688, USA.
authors.forename: S
authors.initials: S
authors.lastname: Aefsky
authors.affiliation: Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688, USA.
authors.forename: M
authors.initials: M
authors.lastname: Cordero
authors.affiliation: Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688, USA.
authors.forename: W
authors.initials: W
authors.lastname: Waggoner
authors.affiliation: Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688, USA.
authors.forename: M
authors.initials: M
authors.lastname: Binderbauer
authors.affiliation: Tri Alpha Energy, Inc., P.O. Box 7010 Rancho Santa Margarita, California 92688, USA.
authors.forename: T
authors.initials: T
authors.lastname: Tajima