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1 results

  • Nonlinear reversed shear Alfvén eigenmode saturation due to spontaneous zonal current generation

  • Part of
  • Shizhao Wei, Tao Wang, Ningfei Chen, Zhiyong Qiu
  • Journal:
    Journal of Plasma Physics / Volume 87 / Issue 5 / October 2021
    Published online by Cambridge University Press:
    22 September 2021, 905870505
    • Article
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  • General nonlinear equations describing reversed shear Alfvén eigenmode (RSAE) self-modulation via zero-frequency zonal structure (ZFZS) generation are derived using nonlinear gyrokinetic theory, which are then applied to study the spontaneous ZFZS excitation as well as RSAE nonlinear saturation. It is found that both electrostatic zonal flow and electromagnetic zonal current can be preferentially excited by finite-amplitude RSAE, depending on specific plasma parameters. The modification to local shear Alfvén wave continuum is evaluated using the derived saturation level of zonal current, which is shown to play a comparable role in saturating RSAE with the ZFZS scattering.