NIFS-009

FULL TEXT (PDF, 570 KB)


Author(s):

H. Sanuki, J. Todoroki and T. Kamimura

Title:

Spatial Structure of Particle-Orbit Loss Regions in l =2 Helical Systems

Date of publication:

Feb. 1990

Key words:

Helical system, orbit-loss, adiabatic invariant, drift equations

Abstract:

Particle orbits and loss regions in both configuration and velocity space are studied on the basis of adiabatic invariants and guiding center drift equations. The boundary of loss region is determined from the condition whether the drift surfaces for both localized particles and transition particles between localized and blocked particles hit the limiter or not . Analytical form of loss region boundary for localized particle with (upsilon_ parallel)=0 is obtained. Effects of ripple modulation and electrostatic potential on particle confinement are also discussed.

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