## Abstract

A gyrokinetic particle-in-cell approach with direct implicit
construction of the coefficient matrix of the Poisson equation from ion
polarization and electron parallel nonlinearity is described and applied
in global electrostatic toroidal plasma transport simulations. The
method is applicable for calculation of the evolution of particle
distribution function

*f*including as special cases strong plasma pressure profile evolution by transport and formation of neoclassical flows. This is made feasible by full*f*formulation and by recording the charge density changes due to the ion polarization drift and electron acceleration along the local magnetic field while particles are advanced. The code has been validated against the linear predictions of the unstable ion temperature gradient mode growth rates and frequencies. Convergence and saturation in both turbulent and neoclassical limit of the ion heat conductivity is obtained with numerical noise well suppressed by a sufficiently large number of simulation particles. A first global full*f*validation of the neoclassical radial electric field in the presence of turbulence for a heated collisional tokamak plasma is obtained. At high Mach number (*M*_{p}∼1) of the poloidal flow, the radial electric field is significantly enhanced over the standard neoclassical prediction. The neoclassical radial electric field together with the related GAM oscillations is found to regulate the turbulent heat and particle diffusion levels particularly strongly in a large aspect ratio tokamak at low plasma current.Original language | English |
---|---|

Pages (from-to) | 5582-5609 |

Journal | Journal of Computational Physics |

Volume | 227 |

Issue number | 11 |

DOIs | |

Publication status | Published - 2008 |

MoE publication type | A1 Journal article-refereed |

## Keywords

- particle simulation
- plasma
- turbulence
- Tokamak
- fusion energy

## Fingerprint

Dive into the research topics of 'Full*f*gyrokinetic method for particle simulation of tokamak transport'. Together they form a unique fingerprint.