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Fully three dimensional ideal MHD stability analysis of low-n modes and Mercier modes in stellarators

Technical Report:

Abstract

The THERPSICHORE three dimensional linear ideal magnetohydrodynamic stability code has been extended to the full MHD equations. The new code is used to calculate the physical growth rates of non-local low-n modes for l=2 torsatron configurations. A comprehensive investigation of the relation between the Mercier modes and the low-n modes has been performed. The unstable localized low-n modes are found to be correlated with the Mercier criterion. Finite growth rates of the low-n modes correspond to finite values of the Mercier criterion parameter. Near the Mercier marginal stability boundary, the low-n modes tend to be weakly unstable with very small growth rates. However, the stability of global-type low-n modes is found to be decorrelated from that of Mercier modes. The low-n modes with global radial structure can be more stable or more unstable than Mercier modes. (author) 19 figs., 2 tabs., 31 refs.
Authors:
Fu, G Y; Cooper, W A; Gruber, R; [1]  Schwenn, U; [2]  Anderson, D V [3] 
  1. Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
  2. Max-Planck-Institut fuer Plasmaphysik, Garching (Germany)
  3. Lawrence Livermore National Lab., CA (United States)
Publication Date:
Oct 01, 1991
Product Type:
Technical Report
Report Number:
LRP-437/91
Reference Number:
SCA: 700340; PA: AIX-23:018259; SN: 92000661897
Resource Relation:
Other Information: PBD: Oct 1991
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; STELLARATORS; PLASMA MACROINSTABILITIES; ASPECT RATIO; BETA RATIO; E CODES; EQUILIBRIUM PLASMA; H CODES; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; MERCIER CRITERION; MODE RATIONAL SURFACES; ROTATIONAL TRANSFORM; S CODES; T CODES; THEORETICAL DATA; THREE-DIMENSIONAL CALCULATIONS; 700340; PLASMA WAVES, OSCILLATIONS, AND INSTABILITIES
OSTI ID:
10118541
Research Organizations:
Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE92617388; TRN: CH9200075018259
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
CHN
Size:
40 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Fu, G Y, Cooper, W A, Gruber, R, Schwenn, U, and Anderson, D V. Fully three dimensional ideal MHD stability analysis of low-n modes and Mercier modes in stellarators. Switzerland: N. p., 1991. Web.
Fu, G Y, Cooper, W A, Gruber, R, Schwenn, U, & Anderson, D V. Fully three dimensional ideal MHD stability analysis of low-n modes and Mercier modes in stellarators. Switzerland.
Fu, G Y, Cooper, W A, Gruber, R, Schwenn, U, and Anderson, D V. 1991. "Fully three dimensional ideal MHD stability analysis of low-n modes and Mercier modes in stellarators." Switzerland.
@misc{etde_10118541,
title = {Fully three dimensional ideal MHD stability analysis of low-n modes and Mercier modes in stellarators}
author = {Fu, G Y, Cooper, W A, Gruber, R, Schwenn, U, and Anderson, D V}
abstractNote = {The THERPSICHORE three dimensional linear ideal magnetohydrodynamic stability code has been extended to the full MHD equations. The new code is used to calculate the physical growth rates of non-local low-n modes for l=2 torsatron configurations. A comprehensive investigation of the relation between the Mercier modes and the low-n modes has been performed. The unstable localized low-n modes are found to be correlated with the Mercier criterion. Finite growth rates of the low-n modes correspond to finite values of the Mercier criterion parameter. Near the Mercier marginal stability boundary, the low-n modes tend to be weakly unstable with very small growth rates. However, the stability of global-type low-n modes is found to be decorrelated from that of Mercier modes. The low-n modes with global radial structure can be more stable or more unstable than Mercier modes. (author) 19 figs., 2 tabs., 31 refs.}
place = {Switzerland}
year = {1991}
month = {Oct}
}