Parametric dependence of fast-ion transport events on the National Spherical Torus Experiment

被引：20

作者：

Fredrickson, E. D. ^{[1
]}

Gorelenkov, N. N. ^{[1
]}

Podesta, M. ^{[1
]}

Bortolon, A. ^{[2
]}

Gerhardt, S. P. ^{[1
]}

Bell, R. E. ^{[1
]}

Diallo, A. ^{[1
]}

LeBlanc, B. ^{[1
]}

机构：

[1] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[2] Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37916 USA

来源：

NUCLEAR FUSION | 2014年 / 54卷 / 09期

关键词：

energetic particles; TAE; NSTX; ALFVEN EIGENMODES; JT-60U; TOKAMAK; PLASMAS; DRIVEN; BEAM;

D O I：

10.1088/0029-5515/54/9/093007

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：

This paper presents an empirical approach towards characterizing the stability boundaries for some common energetic-ion-driven instabilities as seen on the National Spherical Torus Experiment (NSTX). Understanding the conditions for which beam-driven instabilities arise, and the extent of the resulting perturbation to the fast-ion population, is important for predicting and eventually demonstrating non-inductive current ramp-up and sustainment in NSTX-U (Menard J. et al 2012 Nucl. Fusion 52 083015), as well as the performance of future fusion plasma experiments such as ITER. A database has been constructed, based on shots from the 2010 experimental campaign for which TRANSP runs were performed. Each shot was divided into 50 ms intervals and the dominant beam-driven activity was characterized, and plasma parameters were collected into a database. It is found that TAE avalanches are present for beta(fast)/beta(total) > 0.3 and quiescent plasmas only for beta(fast)/beta(total) < 0.3.

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页数：7

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