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Title: Magnetohydodynamics stability of compact stellarators

Abstract

Recent stability results of external kink modes and vertical modes in compact stellarators are presented. The vertical mode is found to be stabilized by externally generated poloidal flux. A simple stability criterion is derived in the limit of large aspect ratio and constant current density. For a wall at infinite distance from the plasma, the amount of external flux needed for stabilization is given by Fi = (k2 {minus} k)=(k2 + 1), where k is the axisymmetric elongation and Fi is the fraction of the external rotational transform. A systematic parameter study shows that the external kink mode in QAS can be stabilized at high beta ({approximately} 5%) without a conducting wall by magnetic shear via 3D shaping. It is found that external kinks are driven by both parallel current and pressure gradient. The pressure contributes significantly to the overall drive through the curvature term and the Pfirsch-Schluter current.

Authors:
; ; ;  [1]
  1. and others
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., Princeton, NJ (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
750055
Report Number(s):
PPPL-3412
TRN: US0000735
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 3 Jan 2000
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; STELLARATORS; KINK INSTABILITY; STABILIZATION; MAGNETIC FLUX; ROTATIONAL TRANSFORM; ELECTRIC CURRENTS; PRESSURE GRADIENTS

Citation Formats

Fu, G Y, Ku, L P, Cooper, W A, and Hirshman, S H. Magnetohydodynamics stability of compact stellarators. United States: N. p., 2000. Web. doi:10.2172/750055.
Fu, G Y, Ku, L P, Cooper, W A, & Hirshman, S H. Magnetohydodynamics stability of compact stellarators. United States. https://doi.org/10.2172/750055
Fu, G Y, Ku, L P, Cooper, W A, and Hirshman, S H. Mon . "Magnetohydodynamics stability of compact stellarators". United States. https://doi.org/10.2172/750055. https://www.osti.gov/servlets/purl/750055.
@article{osti_750055,
title = {Magnetohydodynamics stability of compact stellarators},
author = {Fu, G Y and Ku, L P and Cooper, W A and Hirshman, S H},
abstractNote = {Recent stability results of external kink modes and vertical modes in compact stellarators are presented. The vertical mode is found to be stabilized by externally generated poloidal flux. A simple stability criterion is derived in the limit of large aspect ratio and constant current density. For a wall at infinite distance from the plasma, the amount of external flux needed for stabilization is given by Fi = (k2 {minus} k)=(k2 + 1), where k is the axisymmetric elongation and Fi is the fraction of the external rotational transform. A systematic parameter study shows that the external kink mode in QAS can be stabilized at high beta ({approximately} 5%) without a conducting wall by magnetic shear via 3D shaping. It is found that external kinks are driven by both parallel current and pressure gradient. The pressure contributes significantly to the overall drive through the curvature term and the Pfirsch-Schluter current.},
doi = {10.2172/750055},
url = {https://www.osti.gov/biblio/750055}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {1}
}