The use of the compressional hydromagnetic mode (also called the magnetosonic or, simply, the fast wave) is examined in some detail with respect to the heating of a tritium plasma containing a few percent deuterium. Efficient absorption of wave energy by the deuteron component is found when ω = ωC (deuterons), with Qwave 100. Reasonable efficiencies are found also for electron heating, but coherence effects between transit-time and Landau damping for electrons reduce the total absorption for both processes to one-half of the transit-time power, calculated separately.The fusion output of a two-component neutral-injected plasma can be enhanced by selective heating of the injected deuterons. Also, selective deuteron absorption may be used for ion-tail creation by radiofrequency excitation alone, as an alternative to neutral injection. The dominant behaviour of the high-energy deuteron distribution function is found to be f(v) ~ exp[(3/2)∫vdv / ], where is the Chandrasekhar-Spitzer drag coefficient, and is the Kennel-Engelmann quasi-linear diffusion coefficient for wave-particle interaction at the deuteron cyclotron frequency. An analytic solution to the one-dimensional Fokker-Planck equation, with r.f.-induced diffusion, is developed, and using this solution together with Duane's fit to the D-T fusion cross-section, it is found that the nuclear-fusion power output from an r.f.-produced two-component plasma can significantly exceed the incremental (radiofrequency) power input.
[1]
Lyman Spitzer,et al.
THE ELECTRICAL CONDUCTIVITY OF AN IONIZED GAS
,
1950
.
[2]
T. H. Stix.
Oscillations of a Cylindrical Plasma
,
1957
.
[3]
T. H. Stix,et al.
Generation and Thermalization of Plasma Waves
,
1958
.
[4]
S. K. Trehan,et al.
Plasma oscillations (I)
,
1960
.
[5]
Measurements on the Fast Hydromagnetic Wave above the Ion Cyclotron Frequency
,
1962
.
[6]
T. H. Stix,et al.
The Theory Of Plasma Waves
,
1962
.
[7]
Investigation of resonance excitation and Cerenkov damping of high-frequency plasma oscillations
,
1963
.
[8]
D. Swanson,et al.
EXPERIMENTAL STUDY OF COMPRESSIONAL HYDROMAGNETIC WAVES
,
1964
.
[9]
ABSORPTION OF ION CYCLOTRON WAVES BY ONE COMPONENT OF A TWO-ION PLASMA
,
1965
.
[10]
Charles F. Kennel,et al.
Velocity Space Diffusion from Weak Plasma Turbulence in a Magnetic Field
,
1966
.
[11]
M. Rothman,et al.
Plasma Heating by the Fast Hydromagnetic Wave
,
1967
.
[12]
J. Dawson,et al.
Production of Thermonuclear Power by Non-Maxwellian Ions in a Closed Magnetic Field Configuration
,
1971
.
[13]
E. Canobbio.
Neoclassical theory of landau damping and ion and electron transit-time magnetic pumping (TTMP) in toroidal geometry
,
1972
.
[14]
A. Messiaen,et al.
Toroidal plasma resonances and electron transit time damping for heating large thermonuclear tori
,
1974
.