Parametric instabilities in the fast-wave heating of tokamaks

Journal Article · Sat Dec 01 04:00:00 EST 1984 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.864599· OSTI ID:6041984

Tripathi, V K

A high-power whistler wave launched into a tokomak is susceptible to resonant decay into ion-cyclotron and lower-hybrid waves when the lower-hybrid resonance layer ..omega../sub lh/ = ..omega../sub 0/ exists in the outer region of the plasma x/sup 2//a/sup 2/> or approx. =0.6, where ..omega../sub 0/ is the frequency of the whistler, ..omega../sub lh/ is the lower-hybrid frequency, x is the distance away from the center of the plasma, and a is the minor radius. For Princeton Large Torus parameters, this requires a line average density n> or approx. =6 x 10/sup 13/ cm/sup -3/ when the whistler frequency ..omega../sub 0/approx. =800 MHz and the threshold pump power for the onset of the instability is 100 kW. The threshold power is determined by the convection losses and it increases nonlinearly with the temperature and very rapidly with decreasing density. The parametric instability would tend to deposit the momentum and energy of the pump wave in the outer region of the plasma.

• Research Organization: GA Technologies, Inc., San Diego, California 92138
• DOE Contract Number: AT03-76ET51011
• OSTI ID: 6041984
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 27:12; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700107 -- Fusion Energy-- Plasma Research-- Instabilities
700108 -- Fusion Energy-- Plasma Research-- Wave Phenomena
DISPERSION RELATIONS
ELECTROMAGNETIC RADIATION
HEATING
INSTABILITY
ION PLASMA WAVES
ION WAVES
NOISE
PARAMETRIC INSTABILITIES
PLASMA HEATING
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA WAVES
PLT DEVICES
POWER
RADIATIONS
RADIO NOISE
RADIOWAVE RADIATION
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
WAVE PROPAGATION
WHISTLERS