Particle Confinement in Axisymmetric Poloidal Magnetic Field Configurations with Zeros of B: Methodological Note

Journal Article · Thu Dec 15 04:00:00 EST 2005 · Plasma Physics Reports

DOI:https://doi.org/10.1134/1.2147646· OSTI ID:20718856

Arsenin, V V; Skovoroda, A A ^[1]

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1. Nuclear Fusion Institute, Russian Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182 (Russian Federation)

Collisionless particle confinement in axisymmetric configurations with magnetic field nulls is analyzed. The existence of an invariant of motion--the generalized azimuthal momentum--makes it possible to determine in which of the spatial regions separated by magnetic separatrices passing through the magnetic null lines the particle occurs after it leaves the vicinity of a magnetic null line. In particular, it is possible to formulate a sufficient condition for the particle not to escape through the separatrix from the confinement region to the external region. In the configuration under analysis, the particles can be lost from a separatrix layer with a thickness on the order of the Larmor radius because of the nonconservation of the magnetic moment {mu}. In this case, the variations in {mu} are easier to describe in a coordinate system associated with the magnetic surfaces. An analysis is made of the applicability of expressions for the single-pass change {delta}{mu} in the magnetic moment that were obtained in different magnetic field models for a confinement system with a divertor (such that there is a circular null line)

• OSTI ID: 20718856
• Journal Information: Plasma Physics Reports, Journal Name: Plasma Physics Reports Journal Issue: 12 Vol. 31; ISSN PPHREM; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AXIAL SYMMETRY
DIVERTORS
LARMOR RADIUS
MAGNETIC FIELDS
MAGNETIC MOMENTS
MAGNETIC SURFACES
PLASMA
PLASMA CONFINEMENT
WALL EFFECTS