102 citations · 298 across the 13 of their papers we have counts for
13 papers
Isotope Effects on TEM-driven Turbulence and Zonal Flows in Helical and Tokamak Plasmas
Motoki Nakata, Masanori Nunami, Hideo Sugama +1
Impacts of isotope ion mass on trapped electron mode (TEM) driven turbulence and zonal flows in magnetically confined fusion plasmas are investigated. Gyrokinetic simulations of TE…
Nonlinear entropy transfer via zonal flows in gyrokinetic plasma turbulence
Motoki Nakata, Tomo-Hiko Watanabe, Hideo Sugama
Nonlinear entropy transfer processes in toroidal ion temperature gradient (ITG) and electron temperature gradient (ETG) driven turbulence are investigated based on the gyrokinetic…
Comprehensive Gyrokinetic Study of Eigenstate Transitions in Fast Ion-Driven Electrostatic Drift Instabilities
ByungJun Kang, Hideo Sugama, Tomo-Hiko Watanabe +1
This study comprehensively investigates fast ion-driven drift instability, extending the theory in [B. J. Kang and T. S. Hahm, Phys. Plasmas 26, 042501 (2019)]. The eigenmode equat…
Energy exchange between electrons and ions in ion temperature gradient turbulence
T. Kato, H. Sugama, T. -H. Watanabe +1
Microturbulence in magnetic confined plasmas contributes to energy exchange between particles of different species as well as the particle and heat fluxes. Although the effect of t…
Polarization and magnetization in collisional and turbulent transport processes
H. Sugama, S. Matsuoka, M. Nunami
Expressions of polarization and magnetization in magnetically confined plasmas are derived, which include full expansions in the gyroradius to treat effects of both equilibrium and…
The Eulerian variational formulation of the gyrokinetic system in general spatial coordinates
H. Sugama, S. Matsuoka, M. Nunami +1
The Eulerian variational formulation of the gyrokinetic system with electrostatic turbulence is presented in general spatial coordinates by extending our previous work [H. Sugama,…
Improved linearized model collision operator for the highly collisional regime
Hideo Sugama, Seikichi Matsuoka, Shinsuke Satake +2
The linearized model collision operator for multiple species plasmas given by H. Sugama, T.-H. Watanabe, and M. Nunami [Phys.\ Plasmas {\bf 16}, 112503 (2009)] is improved to be pr…
Eulerian variational formulations and momentum conservation laws for kinetic plasma systems
H. Sugama, M. Nunami, S. Satake +1
The Eulerian variational principle for the Vlasov-Poisson-Ampère system of equations in a general coordinate system is presented. The invariance of the action integral under an arb…
Benchmark of the bootstrap current simulation in helical plasmas
Botsz Huang, Shinsuke Satake, Ryutaro Kanno +2
The importance of the parallel momentum conservation on the bootstrap current evaluation in nonaxisymmetric systems is demonstrated by the benchmarks among the local drift-kinetic…
Moderation of neoclassical impurity accumulation in high temperature plasmas of helical devices
J. L. Velasco, I. Calvo, S. Satake +16
Achieving impurity and helium ash control is a crucial issue in the path towards fusion-grade magnetic confinement devices, and this is particularly the case of helical reactors, w…
Benchmark of a new multi-ion-species collision operator for Monte Carlo neoclassical simulation
Shinsuke Satake, Motoki Nataka, Theerasarn Pianpanit +5
A numerical method to implement a linearized Coulomb collision operator in the two-weight Monte Carlo method for multi-ion-species neoclassical transport simulation is develop…
Effects of collisions on conservation laws in gyrokinetic field theory
H. Sugama, T. -H. Watanabe, M. Nunami
Effects of collisions on conservation laws for toroidal plasmas are investigated based on the gyrokinetic field theory. Associating the collisional system with a corresponding coll…
Metamorphosis of plasma turbulence-shear flow dynamics through a transcritical bifurcation
R. Ball, R. L. Dewar, H. Sugama
The structural properties of an economical model for a confined plasma turbulence governor are investigated through bifurcation and stability analyses. A close relationship is demo…