A new code is presented for solving linear eigenvalue problems from fluid models of the edge plasma of tokamaks. The 2DX code solves linearized fluid equations in a 2D cross-section of the plasma, with toroidal mode number resolving the third dimension. Geometry capabilities include both closed and open field lines, allowing solution of x-point problems as well as a variety of other toroidal an...

Abstract In this contribution, we propose a numerical solution to the Maxwell equations determine electromagnetic fields in toroidal dielectric wave-guide. Analyzing relationship between size of cross-section toroid and its bending radius. We considered sinusoidal time dependence field, then just solve Helmholtz equation waveguide. way analyze for find power radiation each synchronous mode. sho...

Aims. The influence of a toroidal magnetic field on the dynamics of Rossby waves in a thin layer of ideal conductive fluid on a rotating sphere is studied in the " shallow water " magnetohydrodynamic approximation for the first time. Methods. Dispersion relations for magnetic Rossby waves are derived analytically in Cartesian and spherical coordinates. Results. It is shown that the magnetic fie...

As part of the ITER Design Review, the physics requirements were reviewed and as appropriate updated. The focus of this paper will be on recent work affecting the ITER design with special emphasis on topics affecting near-term procurement arrangements. This paper will describe results on: design sensitivity studies, poloidal field coil requirements, vertical stability, effect of toroidal field ...

It is shown that toroidal magnetic field ripple induced particle flux can drive poloidal E ×B speed to bifurcate over the local maximum of the nonlinear poloidal (or parallel) viscosity. Here, E is the electric field and B is the magnetic field. This mechansim, together with the turbulence suppression due to the radial gradient of the E ×B and diamagnetic angular velocity, is employed to explai...

The transport of fast-ions resulting from strongly non-linear Toroidal Alfvén Eigenmode avalanches has been studied experimentally and simulated with the NOVA ideal MHD code and the ORBIT code to model fast ion transport. Detailed measurements of the multi-mode structure and amplitudes have been made to benchmark NOVA calculations of eigenmodes. The ORBIT code has been used to model the fast-io...

It is shown that the ITG-ETG symmetry is nonlinearly broken due to the different response of respectively electrons and ions to Zonal Flows (ZF). ITG is dominated by ITG-ZF nonlinear interactions and turbulence spreading, resulting in size-scaling of the associated turbulent transport. Meanwhile, nonlinear toroidal mode coupling dominates ETG saturation and ETG-ZF interactions enter on the long...

A bound state in the continuum (BIC) is a localized continuous spectrum of radiating waves. In this study, coupled-mode theory introduced to more precisely interpret symmetry-protected BIC and quasi-BIC facile trimeric metasurface, compared with Fano formula, which generate high-quality factor resonance metallic slit metasurface. The multipole decomposition method near field distribution struct...

The df particle-in-cell method for gyrokinetic simulations with kinetic electrons and electromagnetic perturbations [Y. Chen, S. Parker, J. Comput. Phys. 189 (2003) 463] is extended to include arbitrary toroidal equilibrium profiles and fluxsurface shapes. The domain is an arbitrarily sized toroidal slice with periodicity assumed in toroidal direction. It is global radially and poloidally along...

The initial results of coaxial coand counter-helicity spheromak merging studies at the Swarthmore Spheromak Experiment ~SSX! @M. R. Brown, Phys. Plasmas 6, 1717 ~1999!# are reported. In its new configuration, SSX is optimized to study field reversed configuration ~FRC! formation and stability by counter-helicity spheromak merging. A pair of midplane coils magnetically restricts the merging proc...