Lower hybrid experiments on PLT using grills having various n/sub parallel/ spectral widths

Technical Report · Fri May 01 04:00:00 EDT 1987

DOI:https://doi.org/10.2172/6158026· OSTI ID:6158026

Stevens, J E; Bell, R; Bernabei, S; Cavallo, A; Chu, T K; Colestock, P; Hooke, W; Hosea, J; Jobes, F; Luce, T

Coupling structures for lower hybrid current drive experiments have, until now, been smaller than a free space wavelength and have had a correspondingly broad wave number spectrum. In this paper we report the results of experiments on the PLT tokamak using a 16-waveguide grill (2.2 wavelengths) which produces a very narrow n/sub parallel/ = k/sub parallel/c/..omega.. spectrum. Experimental results from the 16-waveguide grill are compared with results from three other PLT grills with less sharply defined n/sub parallel/ spectra. The current drive figure of merit, I/sub p/n/sub e/R/P/sub rf/ approx. =0.14 x 10/sup 14/ A cm/sup -3/ m/W, is approx. =40% higher for the 16-waveguide coupler than for previously reported experiments on PLT, in spite of the larger ''spectral gap.'' 60 refs.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6158026
• Report Number(s): PPPL-2426; ON: DE87013212
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700205* -- Fusion Power Plant Technology-- Fuel
Heating
& Injection Systems
DATA
ELECTRON TEMPERATURE
EXPERIMENTAL DATA
HEATING
HIGH-FREQUENCY HEATING
INFORMATION
LOWER HYBRID HEATING
NUMERICAL DATA
PERFORMANCE TESTING
PLASMA HEATING
PLT DEVICES
TESTING
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
VACUUM SYSTEMS
WAVEGUIDES