Properties of dc helicity injected tokamak plasmas

Several dc helicity injection experiments using an electron beam technique have been conducted on the Current Drive Experiment (CDX) [Phys. Rev. Lett. 5 9, 2165 (1987)] and the Continuous Current Tokamak (CCT) [Phys. Rev. Lett. 6 3, 2365 (1989)]. The data strongly suggest that tokamak plasmas are be...

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Published in:Physics of fluids. B, Plasma physics Plasma physics, 1990-06, Vol.2 (6), p.1415-1420
Main Authors: Darrow, D. S., Ono, M., Forest, C. B., Greene, G. J., Hwang, Y. S., Park, H. K., Taylor, R. J., Pribyl, P. A., Evans, J. D., Lai, K. F., Liberati, J. R.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM-PLASMA SYSTEMS
BEAMS
CLOSED PLASMA DEVICES
CONFINEMENT
CURRENT-DRIVE HEATING
DC SYSTEMS
EFFICIENCY
ELECTRIC FIELDS
ELECTRIC HEATING
ELECTRON BEAMS
ENERGY SYSTEMS
HEATING
HELICITY
JOULE HEATING
LEPTON BEAMS
MAGNETIC CONFINEMENT
PARTICLE BEAMS
PARTICLE PROPERTIES
PLASMA
PLASMA CONFINEMENT
PLASMA HEATING
PLASMA PRODUCTION
POWER SYSTEMS
RESISTANCE HEATING
ROTATING PLASMA
THERMONUCLEAR DEVICES 700101 > Fusion Energy-- Plasma Research-- Confinement, Heating, & Production
TOKAMAK DEVICES
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Summary:Several dc helicity injection experiments using an electron beam technique have been conducted on the Current Drive Experiment (CDX) [Phys. Rev. Lett. 5 9, 2165 (1987)] and the Continuous Current Tokamak (CCT) [Phys. Rev. Lett. 6 3, 2365 (1989)]. The data strongly suggest that tokamak plasmas are being formed and maintained by this method. The largest currents driven to date are 1 kA in CDX (q a =5) and 6 kA in CCT (q a =3.5). An initial comparison of discharge properties with helicity theory indicates rough agreement. Current drive energy efficiencies are 9% and 23% of Ohmic efficiency in two cases analyzed. Strong radial electric fields are observed in these plasmas that cause poloidal rotation and, possibly, improved confinement.
ISSN:0899-8221
2163-503X
DOI:10.1063/1.859573