Quasilinear model for energetic particle diffusion in radial and velocity space

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  • R. E. Waltz
    General Atomics 1 , P.O. Box 85608, San Diego, California 92186-5608, USA
  • E. M. Bass
    University of California-San Diego 2 , 9500 Gilman Dr., La Jolla, California 92093, USA
  • G. M. Staebler
    General Atomics 1 , P.O. Box 85608, San Diego, California 92186-5608, USA

抄録

<jats:p>A quasilinear model for passive energetic particle (EP) turbulent diffusion in radial and velocity space is fitted and tested against nonlinear gyrokinetic tokamak simulations with the GYRO code [J. Candy and R. E. Waltz, Phys. Rev. Lett. 91, 045001 (2003)]. Off diagonal elements of a symmetric positive definite 2×2 EP diffusion matrix account for fluxes up radial (energy) gradients driven by energy (radial) gradients of the EP velocity space distribution function. The quasilinear ratio kernel of the model is provided by a simple analytic formula for the EP radial and velocity space EP diffusivity relative to radial thermal ion energy diffusivity at each linear mode of the turbulence driven by the thermal plasma. The TGLF [G. M. Staebler, J. E. Kinsey, and R. E. Waltz, Phys. Plasmas 14, 0055909 (2007); ibid. 15, 0055908 (2008)] tokamak transport model provides the linear mode frequency and growth rates to the kernel as well as the nonlinear spectral weight for each mode.</jats:p>

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