Thumbnail
Access Restriction
Open

Author Ogawa, K. ♦ Toi, K. ♦ Watanabe, F. ♦ Spong, Donald A. ♦ Shimizu, A. ♦ Osakabe, M. ♦ Ohdachi, S. ♦ Sakakibara, S.
Sponsorship USDOE Office of Science (SC)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ALFVEN EIGENMODES ♦ FUSION PRODUCTS ♦ BEAM IONS ♦ DIII-D ♦ TRANSPORT ♦ PLASMAS ♦ DRIVEN ♦ MODES ♦ ALPHA ♦ TFTR
Abstract Energetic-ion losses induced by toroidicity-induced Alfven eigenmodes (TAEs) and resistive interchange modes (RICs) were observed in neutral-beam heated plasmas of the Large Helical Device (LHD) at a relatively low toroidal magnetic field level (<= 0.75 T). The energy and pitch angle of the lost ions are detected using a scintillator-based lost-fast ion probe. Each instability increases the lost ions having a certain energy/pitch angle. TAE bursts preferentially induce energetic beam ions in co-passing orbits having energy from the injection energy E = 190keV down to 130 keV, while RICs expel energetic ions of E = 190 keV down to similar to 130 keV in passing-toroidally trapped boundary orbits. Loss fluxes induced by these instabilities increase with different dependences on the magnetic fluctuation amplitude: nonlinear and linear dependences for TAEs and RICs, respectively.
ISSN 00295515
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-01-01
Publisher Place United States
Journal Nuclear Fusion
Volume Number 50
Issue Number 8
Organization Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)


Open content in new tab

   Open content in new tab