Modification of Particle Distributions By MHD Instabilities I

R.B. White

关键词: ALPHA PARTICLES;    AMPLITUDES;    BEAM PROFILES;    DISTRIBUTION;    ISLANDS;    MAGNETOHYDRODYNAMICS;    MIXING;    MODIFICATIONS;    PARTICLES;    PHASE SPACE;    SURFACES;    USES MHD;   

DOI  :  10.2172/1001674
RP-ID  :  PPPL-4583
PID  :  OSTI ID: 1001674
Others  :  TRN: US1100797

学科分类：原子、分子光学和等离子物理

美国|英语

来源: SciTech Connect

【 摘 要 】

The modification of particle distributions by low amplitude magnetohydrodynamic modes is an important topic for magnetically confined plasmas. Low amplitude modes are known to be capable of producing significant modification of injected neutral beam profiles, and the same can be expected in burning plasmas for the alpha particle distributions. Flattening of a distribution due to phase mixing in an island or due to portions of phase space becoming stochastic is a process extremely rapid on the time scale of an experiment but still very long compared to the time scale of guiding center simulations. Thus it is very valuable to be able to locate significant resonances and to predict the final particle distribution produced by a given spectrum of magnetohydrodynamic modes. In this paper we introduce a new method of determining domains of phase space in which good surfaces do not exist and use this method for quickly determining the final state of the particle distribution without carrying out the full time evolution leading to it.