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Effects of the finite hybrid element on MHD stability calculations in a cylindrical plasma

✍ Scribed by T. Takizuka; S. Tokuda; M. Azumi; T. Takeda

Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
493 KB
Volume
23
Category
Article
ISSN
0010-4655

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✦ Synopsis

Effects of the finite hybrid element on linear stability calculations of the ideal internal modes in a cylindrical plasma are investigated analytically and numerically. The finiteness of the poloidal mesh size ~most affects the growth rate, and an artificial correction of the toroidal mode number n to ~i~(q, ~e) is necessary. This correction makes the convergence of the growth rate almost quadratic for the case of constant safety factor q. When q is not constant, however, the radial dependence of ~causes a deviation of the convergence from the quadratic form.

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A finite element model of a rotor-bearing system with non-axisymmetric stiffness and mass properties was analyzed in a previous study. In this paper the model is extended to include the effects of external damping due to symmetrical tilting-pad bearings. The same instability mechanisms, due to the l