Statistical Characterization and Classification of Edge-Localized Plasma Instabilities

被引：19
|
作者：
Webster, A. J. [1 ,2 ]
Dendy, R. O. [1 ,2 ,3 ]
机构：
[1] Culham Sci Ctr, JET EFDA, Abingdon OX14 3DB, Oxon, England
[2] Culham Sci Ctr, EURATOM CCFE Fus Assoc, Abingdon OX14 3DB, Oxon, England
[3] Univ Warwick, Ctr Fus Space & Astrophys, Dept Phys, Coventry CV4 7AL, W Midlands, England
来源：
PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 15期
基金：
英国工程与自然科学研究理事会;
关键词：
MODES;
D O I：
10.1103/PhysRevLett.110.155004
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The statistics of edge-localized plasma instabilities (ELMs) in toroidal magnetically confined fusion plasmas are considered. From first principles, standard experimentally motivated assumptions are shown to determine a specific probability distribution for the waiting times between ELMs: the Weibull distribution. This is confirmed empirically by a statistically rigorous comparison with a large data set from the Joint European Torus. The successful characterization of ELM waiting times enables future work to progress in various ways. Here we present a quantitative classification of ELM types, complementary to phenomenological approaches. It also informs us about the nature of ELM processes, such as whether they are random or deterministic. The methods are extremely general and can be applied to numerous other quasiperiodic intermittent phenomena. DOI: 10.1103/PhysRevLett.110.155004
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收藏
页数：5
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