I. G. Abel M. Barnes S. C. Cowley W. Dorland A. A. Schekochihin
A new analytically and numerically manageable model collision operator is developed specifically for turbulence simulations. The like-particle collision operator includes both pitch-angle scattering and energy diffusion and satisfies the physical constraints required for collision operators: it conserves particles, momentum, and energy, obeys Boltz…
PublishedI. G. Abel M. Barnes S. C. Cowley W. Dorland G. W. Hammett A. A. Schekochihin T. Tatsuno
We motivate the need to include collisional dissipation in gyrokinetic turbulence simulations, and constract criteria for a physically vaUd model of such dissipation. A new analytically manageable operator satisfying those criteria is presented and transformed into gyrokinetic variables. The form of conservation laws for collision operators in gyro…
PublishedM. Romanelli G. Regnoli C. Bourdelle
The linear stability of dissipative drift electrostatic modes in tokamak plasmas is studied numerically with an extended version of the gyrokinetic code [Kinezero C. Bourdelle and et al. , Nucl. Fusion 42 , 892 (2002)] including a modified Krook collision operator to account for collisional effects on the trapped electron response. This new version…
PublishedD.J. Applegate C.M. Roach S.C. Cowley W.D. Dorland N. Joiner R.J. Akers N.J. Conway A.R. Field A. Patel M. Valovic M.J. Walsh
Gyrokinetic microstability analyses, with and without electromagnetic effects, are presented for a spherical tokamak plasma equilibrium closely resembling that from a high confinement mode ( H mode ) discharge in the mega-ampere spherical tokamak ( MAST ) [ A. Sykes et al. , Nucl. Fusion 41 , 1423 ( 2001 )] . Electrostatic ion temperature gradient …
Published- 1
- 2