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Fisher, R.K.; Pace, D.C.; Kramer, G.J.; Van Zeeland, M.A.; Nazikian, R.; Heidbrink, W.W.; García-Muñoz, M.
Nuclear fusion, 12/2012, Letnik: 52, Številka: 12Journal Article
We report the first experimental observations of fast-ion loss in a tokamak due to energetic particle driven geodesic acoustic modes (EGAMs). A fast-ion loss detector installed on the DIII-D tokamak observes bursts of beam ion losses coherent with the EGAM frequency. The EGAM activity results in a significant loss of beam ions, comparable to the first orbit losses. The pitch angles and energies of the measured fast-ion losses agree with predictions from a full orbit simulation code SPIRAL, which includes scattering and slowing-down.
