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• W2000244030 endingPage "053018" @default.
• W2000244030 startingPage "053018" @default.
• W2000244030 abstract "Neutral beam injection (NBI) is one of the primary tools foreseen for heating, current drive (CD) and q-profile control in future fusion reactors such as ITER and a Fusion Nuclear Science Facility. However, fast ions from NBI may also provide the drive for energetic particle-driven instabilities (e.g. Alfvénic modes (AEs)), which in turn redistribute fast ions in both space and energy, thus hampering the control capabilities and overall efficiency of NB-driven current. Based on experiments on the NSTX tokamak (M. Ono et al 2000 Nucl. Fusion 40 557), the effects of AEs and other low-frequency magneto-hydrodynamic instabilities on NB-CD efficiency are investigated. A new fast ion transport model, which accounts for particle transport in phase space as required for resonant AE perturbations, is utilized to obtain consistent simulations of NB-CD through the tokamak transport code TRANSP. It is found that instabilities do indeed reduce the NB-driven current density over most of the plasma radius by up to ∼50%. Moreover, the details of the current profile evolution are sensitive to the specific model used to mimic the interaction between NB ions and instabilities. Implications for fast ion transport modeling in integrated tokamak simulations are briefly discussed." @default.
• W2000244030 created "2016-06-24" @default.
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• W2000244030 date "2015-04-17" @default.
• W2000244030 modified "2023-10-17" @default.
• W2000244030 title "Effects of MHD instabilities on neutral beam current drive" @default.
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• W2000244030 doi "https://doi.org/10.1088/0029-5515/55/5/053018" @default.
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