Two-dimensional and relativistic effects in lower-hybrid current drive

Conference · Wed Jun 01 04:00:00 EDT 1983

OSTI ID:5954400

Hewett, D; Hizanidis, K; Krapchev, V; Bers, A

We present new numerical and analytic solutions of the two-dimensional Fokker-Planck equation supplemented by a parallel quasilinear diffusion term. The results show a large enhancement of the perpendicular temperature of both the electrons resonant with the applied RF fields and the more energetic electrons in the tail. Both the RF-generated current and power dissipated are substantially increased by the perpendicular energy broadening in the resonant region. In the presence of a small DC electric field the RF current generated is very much enhanced, much more than in a simple additive fashion. In addition, we present a relativistic formulation of the two-dimensional Fokker-Planck quasilinear equation. From conservation equations, based upon this formulation, we derive the characteristics of RF current drive with energetic electrons. These show how the RF-driven current and its figure of merit (I/P/sub d/) increase with the energy of the current-carrying electrons, and that their perpendicular, random momentum must also increase.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Plasma Fusion Center
• DOE Contract Number: AC02-78ET51013
• OSTI ID: 5954400
• Report Number(s): DOE/ET-51013-86; PFC/RR-83-17; CONF-830452-5; ON: DE83015919
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
CLOSED PLASMA DEVICES
CURRENT-DRIVE HEATING
DIFFERENTIAL EQUATIONS
ELECTRIC HEATING
ENERGY RANGE
EQUATIONS
FOKKER-PLANCK EQUATION
HEATING
HIGH-FREQUENCY HEATING
JOULE HEATING
LOWER HYBRID HEATING
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA HEATING
RELATIVISTIC RANGE
RESISTANCE HEATING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TWO-DIMENSIONAL CALCULATIONS