Artículo
Convective beam ion losses due to Alfven eigenmodes in DIII-D reversed-shear plasmas
Autor/es | Pace, D. C.
Fisher, R. K. García Muñoz, Manuel Heidbrink, W. W. Zeeland, M. A. van |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2011-06 |
Fecha de depósito | 2020-08-31 |
Publicado en |
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Resumen | Coherent losses of neutral beam ions are observed at frequencies corresponding
to toroidal and reversed-shear Alfven eigenmodes (RSAEs) in DIII-D. ´
Reversed-shear profiles are created by injecting beam power during the ... Coherent losses of neutral beam ions are observed at frequencies corresponding to toroidal and reversed-shear Alfven eigenmodes (RSAEs) in DIII-D. ´ Reversed-shear profiles are created by injecting beam power during the plasma current ramp. Beam ion losses stemming from Alfven eigenmode activity ´ contribute to flattening of the energetic ion density profile in such discharges. This is the first observation of convective beam ion losses due to RSAEs. The energies and pitch angles of lost ions are measured and found to exist within a well-defined region of phase space. Loss flux signals decrease in time as current penetrates and Alfven eigenmode activity becomes more core ´ localized. Preliminary Monte Carlo simulations of energetic ion interactions with measured mode structures show the dominant loss mechanism is a transition from a counter-passing orbit to a trapped orbit that is lost to the wall. |
Identificador del proyecto | DE-AC05-06ER23100
SC-G903402 DE-FC02-04ER54698 |
Cita | Pace, D.C., Fisher, R.K., García Muñoz, M., Heidbrink, W.W. y Van Zeeland, M.A. (2011). Convective beam ion losses due to Alfven eigenmodes in DIII-D reversed-shear plasmas. Plasma Physics and Controlled Fusion, 53 (6), 062001-. |
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