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Field Reversed Configurations (FRCs) are formed by first trapping an initial bias field in an ionized plasma and then applying a large field opposite to the bias field. This reversal wraps the field lines around the ionized plasma forming a toroidal configuration that is then compressed by further increase of the reversed field.
NumerEx has developed, implemented, and applied two-dimensional (2-d) magnetohydrodynamic (MHD) simulations model of liner compression of field reversed configurations (FRCs) based on MACH2. These simulations concentrated on FRC formation, translation, capture, and liner compression. We also performed 2-d simulations to assess Rayleigh-Taylor instabilities in the r-theta plane during preionization.
MHD instabilities is one of the main obstacles to realize the tokamak advance operation with high parameters. MHD instabilities suppression and control is a basic and important topic of tokamak plasma research.
Hybrid scenario is an operational regime designed to achieve a long pulse operation with a combination of inductive and non-inductive current drive. It was suggested for the operation of ITER to allow high fusion power in long pulse operations over 1000 s at a plasma current lower than the inductive reference scenario. Engineering tests of reactor-relevant components, such as breeding blankets are...
Large diameter multi-shell gas puffs imploded on the refurbished Z generator will be able to produce high-intensity K-shell radiation. Gas puffs have previously been fielded on a number of generators, including Z prior to the refurbishment. In anticipation of gas puff loads soon to be commissioned on refurbished Z we present preliminary 3-dimensional MHD modeling of the implosion and stagnation of...
In weakly turbulent plasmas three and four wave coupling are the dominating process for the cascading of energy. For incompressible plasmas Goldreich & Sridhar have analyzed possible interactions and concluded different regimes.
Sweeping mechanism of absorption of Alfven wave energy in the divergent solar wind is modeled using a scale-separation approach1. MHD waves are excited through reconnection at the sun with frequencies below the local ion cyclotron frequency. The fluctuations with highest frequencies will be absorbed by heavy ions as the wave packet propagates within the lower corona in the outward direction in decreasing...
Experimental results show that a significant fraction of current will be carried by the ablated plasmas and the current flow through the precursor column strongly depends on the inter-wire gap1. It has been found that the ablation rate of wire core is axially non-uniform. When gaps appear in the wire cores, the plasmas prefilled inside the arrays begins to implode. The ablation dynamics determine...
We conduct two-dimensional numerical simulations to study the effects of inlet swirl on plasma fluid behaviors of a commercial-scale non-equilibrium magnetohydrodynamic (MHD) generator with a thermal input of 1000 MW. The effects of inlet swirl are presented for two cases: (1) with preionization by applying a radio-frequency (RF) electromagnetic field; (2) without the preionization. An inlet swirl...
Solid liners are an attractive load design for use with magnetized liner inertial fusion (MagLIF) and for possible replacement of wire-array Z-pinches on large pulsed-power drivers. Experiments have been conducted on COBRA, our 1 MA, 100 ns rise time pulsed power generator, to investigate three aspects that can affect liner performance: initiation; ablation and precursor formation; and instability...
MagnetoHydroDynamic (MHD) instabilities and turbulence phenomena in tokamak plasmas are complex and multi-dimensional. It is imperative to equip 2D/3D diagnostic systems for a full understanding, which is essential to perfect the theoretical models for MHD and turbulence based transport physics. On KSTAR, such a unique opportunity will be established. A 2D Electron Cyclotron Emission Imaging (ECEI)...
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