Frequency scaling of the lower-hybrid-current-drive density limit in tokamak plasmas

Journal Article · Mon Aug 19 00:00:00 EDT 1985 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.55.829· OSTI ID:5217583

Mayberry, M J; Porkolab, M; Chen, K; Fisher, A S; Griffin, D; Kaplan, R D; Luckhardt, S C; Ramos, J; Rohatgi, R

It is shown experimentally that the lower-hybrid-current-drive density limit is a function of the RF source frequency. While in previous 800-MHz experiments this limit occurred at n-bar/sub e/ = 6 x 10/sup 12/ cm/sup -3/, with a newly installed 2.45-GHz, 100-kW RF system on the Versator II tokamak, fully RF-driven discharges have been achieved at densities up to n-bar/sub e/ = 1.0 x 10/sup 13/ cm/sup -3/, without increasing the toroidal magnetic field (B< or =13 kG, ..omega../sub p/e/sup 2//..omega../sub ce//sup 2/ > 1). Incremental current increases in Ohmically heated discharges have been observed at densities exceeding n-bar/sub e/ = 2.0 x 10/sup 13/ cm/sup -3/.

• Research Organization: Plasma Fusion Center, Research Laboratory of Electronics and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
• DOE Contract Number: AC02-78ET51013
• OSTI ID: 5217583
• Journal Information: Phys. Rev. Lett.; (United States), Vol. 55:8
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA
CURRENT-DRIVE HEATING
LOWER HYBRID HEATING
TOKAMAK DEVICES
PLASMA DENSITY
EXPERIMENTAL DATA
PHOTON EMISSION
PLASMA DIAGNOSTICS
RF SYSTEMS
SCALING LAWS
X RADIATION
CLOSED PLASMA DEVICES
DATA
ELECTRIC HEATING
ELECTROMAGNETIC RADIATION
EMISSION
HEATING
HIGH-FREQUENCY HEATING
INFORMATION
IONIZING RADIATIONS
JOULE HEATING
NUMERICAL DATA
PLASMA HEATING
RADIATIONS
RESISTANCE HEATING
THERMONUCLEAR DEVICES
700101* - Fusion Energy- Plasma Research- Confinement
Heating
&amp; Production