Frequency scaling of the lower-hybrid-current-drive density limit in tokamak plasmas
Journal Article
·
· Phys. Rev. Lett.; (United States)
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), Journal Name: Phys. Rev. Lett.; (United States) Vol. 55:8; ISSN PRLTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
CLOSED PLASMA DEVICES
CURRENT-DRIVE HEATING
DATA
ELECTRIC HEATING
ELECTROMAGNETIC RADIATION
EMISSION
EXPERIMENTAL DATA
HEATING
HIGH-FREQUENCY HEATING
INFORMATION
IONIZING RADIATIONS
JOULE HEATING
LOWER HYBRID HEATING
NUMERICAL DATA
PHOTON EMISSION
PLASMA
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA HEATING
RADIATIONS
RESISTANCE HEATING
RF SYSTEMS
SCALING LAWS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
X RADIATION
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
CLOSED PLASMA DEVICES
CURRENT-DRIVE HEATING
DATA
ELECTRIC HEATING
ELECTROMAGNETIC RADIATION
EMISSION
EXPERIMENTAL DATA
HEATING
HIGH-FREQUENCY HEATING
INFORMATION
IONIZING RADIATIONS
JOULE HEATING
LOWER HYBRID HEATING
NUMERICAL DATA
PHOTON EMISSION
PLASMA
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA HEATING
RADIATIONS
RESISTANCE HEATING
RF SYSTEMS
SCALING LAWS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
X RADIATION