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Title: Comparison of Microinstability Properties for Stellarator Magnetic Geometries

Abstract

The microinstability properties of seven distinct magnetic geometries corresponding to different operating and planned stellarators with differing symmetry properties are compared. Specifically, the kinetic stability properties (linear growth rates and real frequencies) of toroidal microinstabilities (driven by ion temperature gradients and trapped-electron dynamics) are compared, as parameters are varied. The familiar ballooning representation is used to enable efficient treatment of the spatial variations along the equilibrium magnetic field lines. These studies provide useful insights for understanding the differences in the relative strengths of the instabilities caused by the differing localizations of good and bad magnetic curvature and of the presence of trapped particles. The associated differences in growth rates due to magnetic geometry are large for small values of the temperature gradient parameter n identical to d ln T/d ln n, whereas for large values of n, the mode is strongly unstable for all of the different magnetic geometries.

Authors:
; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE; USDOE Office of Science (SC) (US)
OSTI Identifier:
840916
Report Number(s):
PPPL-4082
TRN: US0502287
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 16 Jun 2005
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; GEOMETRY; ION TEMPERATURE; KINETICS; MAGNETIC FIELDS; STABILITY; STELLARATORS; SYMMETRY; TEMPERATURE GRADIENTS; DRIFT INSTABILITY; GYROKINETIC EQUATIONS; HELICAL DEVICES

Citation Formats

Rewoldt, G, Ku, L -P, and Tang, W M. Comparison of Microinstability Properties for Stellarator Magnetic Geometries. United States: N. p., 2005. Web. doi:10.2172/840916.
Rewoldt, G, Ku, L -P, & Tang, W M. Comparison of Microinstability Properties for Stellarator Magnetic Geometries. United States. https://doi.org/10.2172/840916
Rewoldt, G, Ku, L -P, and Tang, W M. 2005. "Comparison of Microinstability Properties for Stellarator Magnetic Geometries". United States. https://doi.org/10.2172/840916. https://www.osti.gov/servlets/purl/840916.
@article{osti_840916,
title = {Comparison of Microinstability Properties for Stellarator Magnetic Geometries},
author = {Rewoldt, G and Ku, L -P and Tang, W M},
abstractNote = {The microinstability properties of seven distinct magnetic geometries corresponding to different operating and planned stellarators with differing symmetry properties are compared. Specifically, the kinetic stability properties (linear growth rates and real frequencies) of toroidal microinstabilities (driven by ion temperature gradients and trapped-electron dynamics) are compared, as parameters are varied. The familiar ballooning representation is used to enable efficient treatment of the spatial variations along the equilibrium magnetic field lines. These studies provide useful insights for understanding the differences in the relative strengths of the instabilities caused by the differing localizations of good and bad magnetic curvature and of the presence of trapped particles. The associated differences in growth rates due to magnetic geometry are large for small values of the temperature gradient parameter n identical to d ln T/d ln n, whereas for large values of n, the mode is strongly unstable for all of the different magnetic geometries.},
doi = {10.2172/840916},
url = {https://www.osti.gov/biblio/840916}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jun 16 00:00:00 EDT 2005},
month = {Thu Jun 16 00:00:00 EDT 2005}
}