Neoclassical equilibrium in gyrokinetic simulations

作者：Garbet X^*; Dif Pradalier G; Nguyen C; Sarazin Y; Grandgirard V; Ghendrih Ph

来源：Physics of Plasmas, 2009, 16(6): 062503.

DOI：10.1063/1.3153328

• entropy
• plasma collision processes
• plasma simulation
• plasma transport processes
• plasma turbulence
• variational techniques

This paper presents a set of model collision operators, which reproduce the neoclassical equilibrium and comply with the constraints of a full-f global gyrokinetic code. The assessment of these operators is based on an entropy variational principle, which allows one to perform a fast calculation of the neoclassical diffusivity and poloidal velocity. It is shown that the force balance equation is recovered at lowest order in the expansion parameter, the normalized gyroradius, hence allowing one to calculate correctly the radial electric field. Also, the conventional neoclassical transport and the poloidal velocity are reproduced in the plateau and banana regimes. The advantages and drawbacks of the various model operators are discussed in view of the requirements for neoclassical and turbulent transport.

• 出版日期2009-6
• 单位中国地震局