Article
Scrape-off layer ion acceleration during fast wave injection in the DIII-D tokamak
Author/s | Pace, D. C.
Pinsker, R. I. Heidbrink, W. W. Fisher, R. K. Zeeland, M. A. van García Muñoz, Manuel |
Department | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Publication Date | 2012-06 |
Deposit Date | 2020-08-28 |
Published in |
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Abstract | Fast wave injection is employed on the DIII-D tokamak as a current drive and electron heating method. Bursts of
energetic ions with energy Eo > 20 keV are observed immediately following fast wave injection in experiment ... Fast wave injection is employed on the DIII-D tokamak as a current drive and electron heating method. Bursts of energetic ions with energy Eo > 20 keV are observed immediately following fast wave injection in experiments featuring the 8th ion cyclotron harmonic near the antenna. Using the energy and pitch angle of the energetic ion burst as measured by a fast-ion loss detector, it is possible to trace the origin of these ions to a particular antenna. The ion trajectories exist entirely within the scrape-off layer. These observations are consistent with the presence of parametric decay instabilities near the antenna strap. It is suggested that the phase space capabilities of the loss detector diagnostic can improve studies of wave injection coupling and efficiency in tokamaks by directly measuring the effects of parametric decay thresholds. |
Project ID. | SC-G903402
DE-FG03-97ER4415 DE-FG02-89ER53296 DE-FG02-08ER54999 |
Citation | Pace, D.C., Pinsker, R.I., Heidbrink, W.W., Fisher, R.K., Van Zeeland, M.A. y García Muñoz, M. (2012). Scrape-off layer ion acceleration during fast wave injection in the DIII-D tokamak. Nuclear Fusion, 52 (6), 063019-. |
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