| 1 | Magnetic Configuration Effects on Fast Ion Losses Induced by Fast Ion Driven Toroidal Alfvén Eigenmodes in the Large Helical Device显示文摘Beam-ion losses induced by fast-ion-driven toroidal Alfvén eigenmodes (TAE) were measured with a scintillator-based lost fast-ion probe (SLIP) in the large helical device (LHD). The SLIP gave simultaneously the energy E and the pitch angle χ=arccos(v // /v) distribution of the lost fast ions. The loss fluxes were investigated for three typical magnetic configurations of R ax vac =3.60 m, 3.75 m, and 3.90 m, where R ax vac is the magnetic axis position of the vacuum field. Dominant losses induced by TAEs in these three configurations were observed in the E/χ regions of 50~190 keV/40°, 40~170 keV/25°, and 30~190 keV/30°, respectively. Lost-ion fluxes induced by TAEs depend clearly on the amplitude of TAE magnetic fluctuations, R ax vac and the toroidal field strength Bt . The increment of the loss fluxes has the dependence of (bTAE /Bt ) s . The power s increases from s = 1 to 3 with the increase of the magnetic axis position in finite beta plasmas. | K.OGAWA M.ISOBE K.TOI F.WATANABE D.A.SPONG A.SHIMIZU M.OSAKABE D.S.DARROW S.OHDACHI S.SAKAKIBARA LHD Experiment Group | 2012 | Plasma Science and Technology2012，14，4： | 0 |
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