Drift Mode Calculations in Nonaxisymmetric Geometry
نویسندگان
چکیده
A fully kinetic assessment of the stability properties of toroidal drift modes has been obtained for nonaxisymmetric (stellarator) geometry, in the electrostatic limit. This calculation is a comprehensive solution of the linearized gyrokinetic equation, using the lowest-order \ballooning representation" for high toroidal mode number instabilities, with a model collision operator. Results for toroidal drift waves destabilized by temperature gradients and/or trapped particle dynamics are presented, using three-dimensional magnetohydrodynamic equilibria generated as part of a design e ort for a quasiaxisymmetric stellarator. Comparisons of these results with those obtained for typical tokamak cases indicate that the basic trends are similar. 52.35Qz, 52.65Tt, 52.55Hc Typeset using REVTEX 1
منابع مشابه
Comparison of particle trajectories and collision operators for collisional transport in nonaxisymmetric plasmas
In this work, we examine the validity of several common simplifying assumptions used in numerical neoclassical calculations for nonaxisymmetric plasmas, both by using a new continuum drift-kinetic code and by considering analytic properties of the kinetic equation. First, neoclassical phenomena are computed for the LHD and W7-X stellarators using several versions of the drift-kinetic equation, ...
متن کاملSeismic Behavior Effect of Knee Braced Frames Considering Different Type of Geometry under Non-Linear Analysis
The design and behavior of a ductile structural system called a knee-braced moment frame are presented in this paper. The design of this structural system is based on a capacity-design concept that results in ductile behavior. The knee part is a fuse-like component that dissipates energy by the formation of plastic flexural and/or shear hinges at its ends and mid-span, when the building is subj...
متن کاملEstimating the inter-story drift in high rise buildings with the flexural and shear cantilever beam and mode-acceleration method
In this study, the seismic inter-story drift of structures is estimated by a combination of mode-acceleration equations with the modelling of high-rise buildings with flexural and shear cantilever beams. In the equation presented for calculating the inter-story drift, having less knowledge of the building is adequate and this issue is of significance in estimating the nonstructural component fo...
متن کاملImpact of time-dependent nonaxisymmetric velocity perturbations on dynamo action of von Kármán-like flows.
We present numerical simulations of the kinematic induction equation in order to examine the dynamo efficiency of an axisymmetric von Kármán-like flow subject to time-dependent nonaxisymmetric velocity perturbations. The numerical model is based on the setup of the French von Kármán-sodium dynamo (VKS) and on the flow measurements from a water experiment conducted at the University of Navarra i...
متن کاملPotentials , E ́ B drifts , and ̄ uctuations in the DIII - D boundary
Reciprocating Langmuir probes are used to investigate the structure of electrostatic potentials, E ́ B drifts, and ̄uctuations in the edge (q < 1), scrape-o layer (SOL) and divertor of single null diverted discharges in the DIII-D tokamak. These measurements demonstrate that the X-point geometry suppresses potential ̄uctuations in the drift wave range of frequencies (20 kHz6 f6 300 kHz) as pred...
متن کامل