Mechanisms of Stochastic Diffusion of Energetic Ions in Spherical Tori

Kolesnichenko, Ya.I. ; White, R.B. ; Yakovenko, Yu.V.

Princeton University. Plasma Physics Laboratory.

关键词: 70 Plasma Physics And Fusion Technology;    Magnetic Moments;    Diffusion;    Confinement;    Magnetic Fields;   

DOI  :  10.2172/793022
RP-ID  :  PPPL-3650
RP-ID  :  AC02-76CH03073
RP-ID  :  793022

美国|英语

来源: UNT Digital Library

【 摘 要 】

Stochastic diffusion of the energetic ions in spherical tori is considered. The following issues are addressed: (I) Goldston-White-Boozer diffusion in a rippled field; (ii) cyclotron-resonance-induced diffusion caused by the ripple; (iii) effects of non-conservation of the magnetic moment in an axisymmetric field. It is found that the stochastic diffusion in spherical tori with a weak magnetic field has a number of peculiarities in comparison with conventional tokamaks; in particular, it is characterized by an increased role of mechanisms associated with non-conservation of the particle magnetic moment. It is concluded that in current experiments on National Spherical Torus eXperiment (NSTX) the stochastic diffusion does not have a considerable influence on the confinement of energetic ions.