Measurements of the radial structure and poloidal spectra of toroidal Alfven eigenmodes in the Tokamak Fusion Test Reactor
- University of Wisconsin, Madison, Wisconsin 53706 (United States)
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
Toroidal Alfven eigenmodes (TAE) have been excited by tangential neutral beam injection in the Tokamak Fusion Test Reactor (TFTR) [[ital Proceedings] [ital of] [ital the] [ital Thirteenth] [ital International] [ital Conference] [ital on] [ital Plasma] [ital Physics] [ital and] [ital Controlled] [ital Nuclear] [ital Fusion] [ital Research], 1990, Washington, D.C. (International Atomic Energy Agency, Vienna, 1990), Vol. I, p. 9]. Beam emission spectroscopy (BES) has been used to study the radial structure and the poloidal power spectra of these modes. Radial profiles show a global, standing wave structure with a node near [ital r]/[ital a]=0.6 and a maximum displacement of about 5--10 mm. The cross-phase profiles and the power spectra both imply that the mode is composed of a mixture of components with various poloidal and toroidal mode numbers, as expected for the TAE. Measurements of the poloidal mode spectrum via BES show good agreement with theoretical simulations performed by a nonvariational, kinetic magnetohydrodynamics stability code (NOVA[minus]K [Cheng, Phys. Rep. [bold 211], 1 (1992)]). In particular, the dominant harmonics in the poloidal spectrum obey the expected relation [ital m]+1/2[approx][ital q]([ital r])[ital n].
- DOE Contract Number:
- FG02-89ER53296; AC02-76CH03073
- OSTI ID:
- 6911846
- Journal Information:
- Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 4:11; ISSN 0899-8221; ISSN PFBPEI
- Country of Publication:
- United States
- Language:
- English
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