Transition from quasiperiodicity to chaos just before sawtooth crash in the ASDEX Upgrade tokamak

被引：21
|
作者：
Igochine, V. [1 ]
Dumbrajs, O. [2 ,3 ]
Zohm, H. [1 ]
机构：
[1] EURATOM, Max Planck Inst Plasmaphys, D-85748 Garching, Germany
[2] Aalto Univ, Assoc Euratom Tekes, FIN-02015 Espoo, Finland
[3] Latvian State Univ, EURATOM Assoc, Inst Solid State Phys, LV-1063 Riga, Latvia
来源：
NUCLEAR FUSION | 2008年 / 48卷 / 06期
关键词：
D O I：
10.1088/0029-5515/48/6/062001
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
In this paper we investigate the sawtooth crash in the ASDEX Upgrade tokamak and present evidence supporting the hypothesis of stochastization of magnetic field lines during the crash. We demonstrate on the basis of soft x-ray and electron cyclotron emission measurements that during the pre-crash phase the quasiperiodic transition to chaos occurs. Magnetohydrodynamic oscillations with two frequencies develop before the crash. Consistent with the most energetically favourable transition from quasiperiodicity to chaos, their frequency ratio is close to the conjugate golden ratio G = f2/f1 = (root 5 - 1)/2 approximate to 0.618. We think that the sawtooth crash has a universal stochastic character and it would be worthwhile to search for these transition signatures in other tokamaks.
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页数：5
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