Formation and sustainment of a 150 kA tokamak by coaxial helicity injection

Journal Article · Mon Jun 06 00:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.3666· OSTI ID:7041606

Nelson, B A; Jarboe, T R; Orvis, D J; McCullough, L A; Xie, J; Zhang, C; Zhou, L ^[1]

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1. University of Washington, Seattle, Washington 98195 (United States)

Coaxial helicity injection is used to produce low-aspect-ratio tokamaks with toroidal currents reaching 150 kA (highest value yet attained by helicity injection current drive) and sustained over 100 kA for many resistive diffusion times, without a current drive transformer. Current drive power efficiency, assuming no anomalous helicity dissipation, is 40% that of Ohmic. These tokamaks have a rotating [ital n]=1 toroidal distortion, with poloidal distortions only on the outer bad-curvature region. Equilibrium reconstruction suggests these plasmas have up to 112 kA of closed-field toroidal current, an aspect ratio [ital A]=1.69, a tokamak [ital q] profile, and a hollow toroidal current profile.

• OSTI ID: 7041606
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:23; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310 -- Plasma Confinement-- (1992-)
700320 -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
ASPECT RATIO
CLOSED PLASMA DEVICES
CONFINEMENT
CURRENT-DRIVE HEATING
DATA
DIFFUSION
EFFICIENCY
ELECTRIC HEATING
ELECTRICAL EQUIPMENT
ENERGY LOSSES
EQUILIBRIUM
EQUIPMENT
EXPERIMENTAL DATA
HEATING
HELICITY
INFORMATION
JOULE HEATING
LOSSES
NUMERICAL DATA
OHM LAW
PARTICLE PROPERTIES
PLASMA
PLASMA CONFINEMENT
PLASMA HEATING
RESISTANCE HEATING
ROTATING PLASMA
STEADY-STATE CONDITIONS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRANSFORMERS