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Article overview
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Improved linearized model collision operator for the highly collisional regime | | Hideo Sugama
; Seikichi Matsuoka
; Shinsuke Satake
; Masanori Nunami
; Tomohiko Watanabe
; | | Date: |
18 Jun 2019 | | Abstract: | The linearized model collision operator for multiple species plasmas given by
H. Sugama, T.-H. Watanabe, and M. Nunami [Phys. Plasmas {f 16}, 112503
(2009)] is improved to be properly applicable up to the highly collisional
regime. The improved linearized model operator retains conservation laws of
particles, momentum, and energy as well as it reproduces the same friction-flow
relations as derived by the linearized Landau operator so that this model can
be used to correctly evaluate neoclassical transport fluxes in all
collisionality regimes. The adjointness relations and Boltzmann’s H-theorem are
exactly satisfied by the improved operator except in the case of collisions
between unlike particle species with unequal temperatures where these relations
and H-theorem still holds approximately because there is a large difference
between the masses of the two species with significantly different
temperatures. Even in the unequal-temperature case, the improved operator can
also be modified so as to exactly satisfy the adjointness relations while it
causes the values of the friction coefficients to deviate from those given by
the Landau operator. In addition, for application to gyrokinetic simulations of
turbulent transport, the improved operator is transformed into the
gyrophase-averaged form with keeping the finite gyroradius effect. | | Source: | arXiv, 1906.7427 | | Services: | Forum | Review | PDF | Favorites | |
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