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 PfirschSchluter current.
 Authors:

 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):
 PPPL3412
TRN: US0000735
 DOE Contract Number:
 AC0276CH03073
 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 PfirschSchluter current.},
doi = {10.2172/750055},
url = {https://www.osti.gov/biblio/750055},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {1}
}