FIELD-LINE STOCHASTICITY IN A TOKAMAK WITH AN ERGODIC MAGNETIC LIMITER

Authors
VIANA RL VASCONCELOS DB
Citation
Rl. Viana et Db. Vasconcelos, FIELD-LINE STOCHASTICITY IN A TOKAMAK WITH AN ERGODIC MAGNETIC LIMITER, Dynamics and stability of systems, 12(2), 1997, pp. 75-88
Citations number
28
Categorie Soggetti
Mechanics,Mathematics
Journal title
Dynamics and stability of systems → ACNP
ISSN journal
02681110
Volume
12
Issue
2
Year of publication
1997
Pages
75 - 88
Database
ISI
SICI code
0268-1110(1997)12:2<75:FSIATW>2.0.ZU;2-6
Abstract
We estimate the threshold value of the perturbation strength needed to cause magnetic field-line stochasticity in the peripheral region of a Tokamak with an ergodic magnetic limiter, accoriding to a Hamiltonian description for field lines. We model the limiter action as a periodi c sequence of impulsive excitations. Two global stochasticity prescrip tions are used: Chirikov's overlapping criterion and the renormalizati on scheme of Escande, Doveil and Benkadda.