Stability of a quasi-flute mode under the Bernstein-Kadomtsev condition in a toroidal confinement system

作     者：Zvonkov, AV Skovoroda, AA 

作者机构：Russian Res Ctr Kurchatov Inst Inst Nucl Fus Moscow 123182 Russia 

出 版 物：《PLASMA PHYSICS REPORTS》 (等离子体物理学报告)

年 卷 期：2004年第30卷第3期

页      面：241-248页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

基　　金：Department of Atomic Science and Technology of the Ministry of Atomic Industry of the Russian Federation Russian Federal Program for State Support of Leading Scientific Schools, (NSh-2024.2003.2) Russian Foundation for Basic Research, RFBR, (03-02-16768) 

主　　题：MAGNETOHYDRODYNAMIC instabilities MAGNETOHYDRODYNAMICS PLASMA confinement OSCILLATIONS PERTURBATION (Mathematics) PLASMA instabilities 

摘      要：It is shown that the growth rate of the MHD instability in toroidal configurations is slower in a situation in which the Bernstein-Kadomtsev condition is satisfied while the Mercier stability criterion is not. Under the Bernstein-Kadomtsev condition, Alfvenic Mercier modes are not excited, but quasi-flute acoustic Mercier modes develop instead. In confinement systems with closed magnetic field lines, the Bernstein-Kadomtsev condition ensures MHD stability;however, a small rotational transform produced by magnetic perturbations can give rise to a quasi-flute acoustic instability whose growth rate is proportional to the perturbation amplitude, in which case the fastest growing oscillations are those with the shortest wavelengths. (C) 2004 MAIK Nauka/Interperiodica.