High-{beta} disruption in tokamaks | Zendy

W. Park | Zendy; E. D. Fredrickson | Zendy; A. Janos | Zendy

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High-{beta} disruption in tokamaks

Author(s) -

W. Park,

E. D. Fredrickson,

A. Janos

Publication year - 1995

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/93735

Subject(s) - ballooning , tokamak , magnetohydrodynamics , beta (programming language) , physics , plasma , flux (metallurgy) , mechanics , thermal , mode (computer interface) , nuclear physics , materials science , thermodynamics , computer science , metallurgy , programming language , operating system

Three dimensional MHD simulations of high-{beta} plasmas show that toroidally localized high-n ballooning modes can be driven unstable by the local pressure steepening which arises from the evolution of low-n modes. Nonlinearly, the high-n mode becomes even more localized and produces a strong local pressure bulge which destroys the flux surfaces resulting in a thermal quench. The flux surfaces then recover temporarily but now contain large magnetic islands. This scenario is supported by experimental data

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