dc.creator | Zeeland, M. A. van | es |
dc.creator | Heidbrink, W. W. | es |
dc.creator | Fischer, R. K. | es |
dc.creator | García Muñoz, Manuel | es |
dc.creator | Kramer, G. J. | es |
dc.date.accessioned | 2020-08-31T15:10:27Z | |
dc.date.available | 2020-08-31T15:10:27Z | |
dc.date.issued | 2011-05 | |
dc.identifier.citation | Van Zeeland, M.A., Heidbrink, W.W., Fischer, R.K., García Muñoz, M. y Kramer, G.J. (2011). Measurements and modeling of Alfven eigenmode induced fast ion transport and loss in DIII-D and ASDEX Upgrade. Physics of Plasmas, 18 (5), 056114-1-056114-14. | |
dc.identifier.issn | 1070-664X | es |
dc.identifier.uri | https://hdl.handle.net/11441/100570 | |
dc.description.abstract | Neutral beam injection into reversed magnetic shear DIII-D and ASDEX Upgrade plasmas
produces a variety of Alfve´nic activity including toroidicity-induced Alfve´n eigenmodes and
reversed shear Alfve´n eigenmodes (RSAEs). These modes are studied during the discharge current
ramp phase when incomplete current penetration results in a high central safety factor and
increased drive due to multiple higher order resonances. Scans of injected 80 keV neutral beam
power on DIII-D showed a transition from classical to AE dominated fast ion transport and, as
previously found, discharges with strong AE activity exhibit a deficit in neutron emission relative
to classical predictions. By keeping beam power constant and delaying injection during the current
ramp, AE activity was reduced or eliminated and a significant improvement in fast ion confinement
observed. Similarly, experiments in ASDEX Upgrade using early 60 keV neutral beam injection
drove multiple unstable RSAEs. Periods of strong RSAE activity are accompanied by a large (peak
dSn=Sn 60%) neutron deficit. Losses of beam ions modulated at AE frequencies were observed
using large bandwidth energy and pitch resolving fast ion loss scintillator detectors and clearly
identify their role in the process. Modeling of DIII-D loss measurements using guiding center
following codes to track particles in the presence of ideal magnetohydrodynamic (MHD)
calculated AE structures (validated by comparison to experiment) is able to reproduce the
dominant energy, pitch, and temporal evolution of these losses. While loss of both co and counter
current fast ions occurs, simulations show that the dominant loss mechanism observed is the mode induced transition of counter-passing fast ions to lost trapped orbits. Modeling also reproduces a coherent signature of AE induced losses and it was found that these coherent losses scale proportionally with the amplitude; an additional incoherent contribution scales quadratically with the mode amplitude. VC 2011 American Institute of Physics. | es |
dc.description.sponsorship | US Department of Energy DE-FC02-04ER54698, SC-G903402, DE-AC02-99CH11466, DE-FG03-97ER54415, DE-FG02-89ER53296, DE-FG02-08ER54999 | es |
dc.format | application/pdf | es |
dc.format.extent | 15 p. | es |
dc.language.iso | eng | es |
dc.publisher | AIP Publishing | es |
dc.relation.ispartof | Physics of Plasmas, 18 (5), 056114-1-056114-14. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.title | Measurements and modeling of Alfven eigenmode induced fast ion transport and loss in DIII-D and ASDEX Upgrade | es |
dc.type | info:eu-repo/semantics/article | es |
dc.type.version | info:eu-repo/semantics/publishedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear | es |
dc.relation.projectID | DE-FC02-04ER54698 | es |
dc.relation.projectID | SC-G903402 | es |
dc.relation.projectID | DE-AC02-99CH11466 | es |
dc.relation.projectID | DE-FG03-97ER54415 | es |
dc.relation.projectID | DE-FG02-89ER53296 | es |
dc.relation.projectID | DE-FG02-08ER54999 | es |
dc.relation.publisherversion | http://dx.doi.org/10.1063/1.3574663 | es |
dc.identifier.doi | 10.1063/1.3574663 | es |
dc.contributor.group | Universidad de Sevilla. RNM138: Física Nuclear Aplicada | es |
dc.journaltitle | Physics of Plasmas | es |
dc.publication.volumen | 18 | es |
dc.publication.issue | 5 | es |
dc.publication.initialPage | 056114-1 | es |
dc.publication.endPage | 056114-14 | es |