Using theoretical arguments, a simple scaling law for the size of the intrinsic rotation observed in tokamaks in the absence of a momentum injection is found: The velocity generated in the core of a tokamak must be proportional to the ion temperature difference in the core divided by the plasma current, independent of the size of the device. The constant of proportionality is of the order of 10...

In nuclear fusion magnetic confinement devices, equilibrium calculations for realistic systems are necessarily based on numerical solutions. In the present work, we describe some of the latest updates to the code FLOW [L. Guazzotto, R. Betti, J. Manickam and S. Kaye, Phys. of Plasmas 11, 604 (2004)] and give some applications. In this work we apply the code to both tokamak and Reverse Field Pin...

Increasing evidence that the edge plasma plays a crucial role in global tokamak continement motivates this study of two-dimensional (2-D) (0,~) computational models of fluid transport in the edge plasma region. Fluid plasma equations, boundary conditions, and a coupled neutral-plasma model are developed assuming toroidal symmetry. A plasma potential equation~is presented for consistent drift fl...

ITER is a fusion experimental reactor to show scientific and technological feasibility of fusion energy. It is designed to produce fusion power of 500MW for 300-500 seconds with fusion energy gain Q at least 10 (Q ≥10) [1], [2]. ITER should show scientific and technological feasibility of fusion energy as one step to DEMO, which produces electricity by fusion energy. Although design of DEMO wil...

A three-wave interaction model with quadratic nonlinearities and linear growth/decay rates is used to investigate the occurrence of drift-wave turbulence driven by pressure gradients in the edge plasma of a tokamak. Model parameters are taken from a typical set of measurements of the floating electrostatic potential in the tokamak edge region. Some aspects of the temporal dynamics exhibited by ...

Neoclassical shielding is the dominant mechanism reducing the collisionless zonal flow in a tokamak. Previously, this phenomenon was analyzed in the case of an essentially homogeneous equilibrium since the wavelength of the zonal flow perturbation was assumed to be much less than the scale length of background plasma parameters. This assumption is not appropriate in a tokamak pedestal. Therefor...

A method to determine the poloidal mode number m in a spherical tokamak based on magnetic probe data was developed. Perturbed magnetic fields at Mirnov coils are calculated for distributed helical filamentary currents on rational surfaces assuming the maximum current amplitude, m and n (toroidal mode number), and the toroidal location of the filaments. These free parameters were determined from...

The controlling of plasma shape and position are essential to the success of Tokamak discharge. A real-time image acquisition system was designed to obtain plasma radiation image during the discharge processes in the Experimental Advanced Superconducting Tokamak (EAST) device. The hardware structure and software design of this visible camera system are introduced in detail. According to the gen...

STARFIRE A CONCEPTUAL DESIGN OF A COMMERCIAL TOKAMAK POWER PLANT. Starfire is a conceptual design for a commercial tokamak power plant based on the deuterium/tritium/lithium fuel cycle. The emphasis of the study is on the simplicity of the engineering design, maintainability, lower electricity cost, and improved safety and environmental features. The reactor has a 7-m major radius and produces ...

A one-dimensional Vlasov-Poisson model is used to describe the parallel transport in a tokamak scrape-off layer. Thanks to a recently-developed ‘asymptoticpreserving’ numerical scheme, it is possible to lift numerical constraints on the time step and grid spacing, which are no longer limited by, respectively, the electron plasma period and Debye length. The Vlasov approach provides a good veloc...