Evidence for the Importance of Trapped Particle Resonances for Resistive Wall Mode Stability in High Beta Tokamak Plasmas
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027-6902 (United States)
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)
- FAR-TECH, Inc., 3550 General Atomics Court, San Diego, California 92121 (United States)
- Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543-0451 (United States)
Active measurements of the plasma stability in tokamak plasmas reveal the importance of kinetic resonances for resistive wall mode stability. The rotation dependence of the magnetic plasma response to externally applied quasistatic n=1 magnetic fields clearly shows the signatures of an interaction between the resistive wall mode and the precession and bounce motions of trapped thermal ions, as predicted by a perturbative model of plasma stability including kinetic effects. The identification of the stabilization mechanism is an essential step towards quantitative predictions for the prospects of ''passive'' resistive wall mode stabilization, i.e., without the use of an ''active'' feedback system, in fusion-alpha heated plasmas.
- OSTI ID:
- 21538375
- Journal Information:
- Physical Review Letters, Vol. 106, Issue 21; Other Information: DOI: 10.1103/PhysRevLett.106.215002; (c) 2011 American Institute of Physics; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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