Radial Structure of Alfven Eigenmodes in the DIII-D Tokamak through Electron-Cyclotron-Emission Measurements
Journal Article
·
· Physical Review Letters
- Oak Ridge Institute for Science Education, P.O. Box 117, Oak Ridge, Tennessee 37831-0117 (United States)
- Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543 (United States)
- Institute for Fusion Studies, University of Texas, Austin, Texas (United States)
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)
- University of California, Irvine, California (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
- University of Wisconsin, Madison, Wisconsin 53706 (United States)
- University of California, Los Angeles, California 90095 (United States)
The spatial structure of toroidal Alfven eigenmodes and reversed shear Alfven eigenmodes in DIII-D is obtained from electron-cyclotron-emission measurements. Peak measured temperature perturbations are of similar magnitude for both toroidal Alfven eigenmodes and reversed shear Alfven eigenmodes and found to be {delta}T{sub e}/T{sub e}{approx_equal}0.5%. Simultaneous measurements of density fluctuations using beam-emission spectroscopy indicate {delta}n{sub e}/n{sub e}{approx_equal}0.25%. Predictions of the measured temperature and density perturbation profiles as well as {delta}T{sub e}/{delta}n{sub e} from the ideal magnetohydrodynamic code NOVA are in close agreement with experiment.
- OSTI ID:
- 20860878
- Journal Information:
- Physical Review Letters, Vol. 97, Issue 13; Other Information: DOI: 10.1103/PhysRevLett.97.135001; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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