Effect of drifts on the diffusion of runaway electrons in tokamak stochastic magnetic fields

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860431· OSTI ID:5504150

Myra, J R; Catto, P J ^[1]

---

1. Lodestar Research Corporation, Boulder, Colorado 80301 (United States)

The quasilinear diffusion of runaway electrons in tokamak stochastic magnetic fields is examined. Previous models are generalized with respect to the spatial location and coherency of the perturbing magnetic fields, treatment of the radial as well as poloidal drift motion of the electrons, and the role of sidebands that arise from the beating of the electron drift motion with the applied perturbing fields. It is found that drift effects act to reduce the level of quasilinear diffusion by an amount that depends on the poloidal distribution of the magnetic turbulence. The results are employed to estimate the internal magnetic fluctuation levels at the edge during recent experiments on the TEXT tokamak (Phys. Fluids B {bold 3}, 2038 (1991)), where the drift modification effects are shown to be small. It is inferred that intrinsic magnetic turbulence controls runaway diffusion, but not the thermal diffusivity of the background electrons.

• DOE Contract Number: FG02-88ER53263
• OSTI ID: 5504150
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 4:1; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310 -- Plasma Confinement-- (1992-)
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
ANNULAR SPACE
ASYMPTOTIC SOLUTIONS
CLOSED CONFIGURATIONS
CLOSED PLASMA DEVICES
CONFIGURATION
DIFFUSION
ELECTRON DRIFT
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
LEPTONS
MAGNETIC FIELD CONFIGURATIONS
PHYSICAL PROPERTIES
PLASMA DRIFT
QUASILINEAR PROBLEMS
RUNAWAY ELECTRONS
SLABS
SPACE
STOCHASTIC PROCESSES
THERMAL DIFFUSIVITY
THERMODYNAMIC PROPERTIES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TOROIDAL CONFIGURATION
TRANSPORT THEORY
TURBULENCE