Reconstructing the fast-ion velocity distribution in the DIII-D tokamak during Alfvén eigenmode activity

Birgitte Madsen*, Mirko Salewski, W. W. Heidbrink, L. Stagner, M. Podestá, D. Lin, A. V. Garcia, Per Christian Hansen, J. Huang

*Corresponding author for this work

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Abstract

Fast-ion velocity-space tomography enables reconstruction of the 2D fast-ion velocity distribution from a set of measurements. Here, we reconstruct the fast-ion velocity distribution for plasmas with strong and weak Alfvén eigenmode (AE) activity using the four-view fast-ion D-alpha (FIDA) diagnostics in the DIII-D tokamak. We find that the fast-ion losses due to strong AE activity are selective in velocity-space with a particularly strong density decrease in the population of co-going fast-ions with energies between 40 and 70 keV.
Original languageEnglish
Title of host publicationProceedings of 46th EPS Conference on Plasma Physics
EditorsC. Riconda, S. Brezinsek, K. McCarty, D. Burgess, P. Brault, D. Farina
Number of pages4
Volume43C
PublisherEuropean Physical Society
Publication date2019
Article numberP1.1026
ISBN (Electronic)979-10-96389-11-7
Publication statusPublished - 2019
Event46th EPS Conference on Plasma Physics - Milan, Italy
Duration: 8 Jul 201912 Sep 2019

Conference

Conference46th EPS Conference on Plasma Physics
CountryItaly
CityMilan
Period08/07/201912/09/2019

Cite this

Madsen, B., Salewski, M., Heidbrink, W. W., Stagner, L., Podestá, M., Lin, D., Garcia, A. V., Hansen, P. C., & Huang, J. (2019). Reconstructing the fast-ion velocity distribution in the DIII-D tokamak during Alfvén eigenmode activity. In C. Riconda, S. Brezinsek, K. McCarty, D. Burgess, P. Brault, & D. Farina (Eds.), Proceedings of 46th EPS Conference on Plasma Physics (Vol. 43C). [P1.1026] European Physical Society. http://ocs.ciemat.es/EPS2019PAP/html/