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Improving fast-ion confinement in high-performance discharges by suppressing Alfvén eigenmodes

  • Author(s): Kramer, GJ;
  • Podesta, M;
  • Holcomb, C;
  • Cui, L;
  • Gorelenkov, NN;
  • Grierson, B;
  • Heidbrink, WW;
  • Nazikian, R;
  • Solomon, W;
  • Van Zeeland, MA;
  • Zhu, Y
  • et al.

We show that the degradation of fast-ion confinement in steady-state DIII-D discharges is quantitatively consistent with predictions based on the effects of multiple unstable Alfvén eigenmodes on beam-ion transport. Simulation and experiment show that increasing the radius where the magnetic safety factor has its minimum is effective in minimizing beam-ion transport. This is favorable for achieving high performance steady-state operation in DIII-D and future reactors. A comparison between the experiments and a critical gradient model, in which only equilibrium profiles were used to predict the most unstable modes, show that in a number of cases this model reproduces the measured neutron rate well.

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