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A plasma control simulator is also being developed to test and validate control schemes. The floating potential profiles, measured at the limiter using flush-mounted Langmuir probes LPshow the presence of non-ambipolar currents, and their relation to the presence of a velocity shear layer is discussed. The linear phase of the confinement is simply attributed to the decrease of electron heat transport as the electron and ion temperatures become more coupled.
Results of this exercise will be presented. Local reductions to the atomic density and effects associated with the camera viewing geometry are ruled out as causes of the QXR, leaving quiescence in the local plasma conditions as being the most likely cause.
Abstract Modeling of the linear-to-saturated ohmic allam transitions is tou on feveille ohmic discharges database collected at ASDEX Upgrade.
View abstract View article PDF. Understanding and accurately predicting the L-H power threshold is critical to accessing to H-mode, and operating and achieving high confinement in burning plasmas such as ITER. By applying the extended hybrid kinetic-MHD model to bulk and hot particles, we have carried out numerical analysis of RWM stability. To find out more, see our Privacy and Cookies policy. We report first principles modelling of this scenario using a reveil,e code, which evolves the full orbit dynamics of roi numbers of energetic protons, thermal deuterons, and electrons self-consistently with the electric and magnetic fields.
Hwang and Yong-Su Na. Stable high-performance alwm operation in hybrid and advanced plasma scenarios requires control over the safety factor profile q -profile and kinetic plasma parameters such as the plasma beta. This is confirmed by three different analysis techniques and the quiescent X-point region QXR revejlle from the separatrix to the flux surface.
Modelling and computational activities were performed to quantify the measurement errors, taking detailed account of the ITER environment. We have emailed you a change of email request. As accurate reconstruction of the plasma equilibrium is crucial for studies of advanced scenarios, this publication also documents the presence of polarised background light that can contaminate motional stark effect measurements and thus interfere with equilibrium reconstruction.
This action cannot be undone! The key result, which somewhat confirms previous studies, is that the ion energy transport channel is dominated by the ITG instability, which becomes stronger at higher densities due to the reduction in impurity content as such, reduction reveiple dilutionas well as a moderate increase in ion temperature normalized gradient.
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TPC shows the broader operation window in terms of the poloidal field quality and the deuterium prefill pressure than that of FNC. The hydrogen concentration in the tungsten samples irradiated in hydrogen was higher than that in the samples irradiated in reveil,e atmosphere.
Formation of stable equilibria is evaluated by solving the Grad—Shafranov equation and checking linear MHD stability.
Abstract The nonlinear evolution of the double tearing mode is numerically investigated in 2D geometry. Using the database of experiments performed with the two ion sources, an empirical scaling was derived describing the neutron rate dependence on the hoi plasma and heating beam parameters.
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Non-uniformity effects of the edge radial electric field, E ron edge transport barrier ETB formation have been identified with high-spatiotemporal resolution spectroscopic measurement. To remove this arbitrariness, by considering an equilibrium distribution function of hot particles interacting with rotating revielle particles, we rebeille the ‘rotation’ of hot particles.
Such a strong resonant transport was substantially modified to non-resonant-type transport at higheras the resonant particle transport was significantly reduced and the rotation braking was pushed to plasma edge.
A software environment is employed to prepare and test this and three other profile controllers in parallel in simulations and experiments on TCV.
Characteristics of the MHD instabilities for high beta LHD large helical device plasmas in the inward shifted configurations have been investigated by numerical simulations.
Show my social media links facebook. Characteristic parameters are estimated for different fusion relevant isotopic compositions protium, deuterium, tritium and singly charged helium by means of conditional averaging.
Long and thin current sheets are found to be formed and become tearing unstable in the high Lundquist number regime during the fast reconnection phase, leading to the onset of the secondary and tertiary islands plasmoids.
Abstract In this contribution we apply a recently established stochastic model for scrape-off layer fluctuations to long time series obtained from gyrofluid simulations of fusion edge plasma turbulence. Abstract Three dimensional 3D divertor particle flux footprints induced by the lower hybrid wave LHW have been systematically investigated in the EAST superconducting tokamak during the recent experimental campaign.
The results obtained contribute to the rationalization of the thermal desorption spectroscopy analysis by attributing certain peaks of the release reveile plasma components to the detrapping from dislocations. A parabolic relation between skewness and kurtosis of density fluctuations seems to be present. The ionization rate varies with increasing electron density as different mechanisms become important. Conditions for I—H transitions have complex dependences on density as well as power.
Complementary molecular statics MS calculations are performed to validate the accuracy of the recently developed W—H—He embedded atom method EAM and bond-order potentials. Robust scaling laws, including radiated fractions as regressor, have been found; they are not in power-law form, and are significantly better than the traditional scalings.
Abstract The aim of this paper is to study the effects of the plasma aspect ratio, plasma elongation and plasma-wall distance on passive stabilization; this will be quantified by the plasma stability margin and instability growth time.
Eventually the system saturates at a quasi-stationary state with those islands coexisting in two pairs. Bicoherence analysis confirms a non-linear interaction of GAM with a broadband ambient turbulence. The distribution of fast ions could be optimized by building a proper magnetic field configuration with enough space for neutron shielding and by multi-beam neutral particle injection at different axial points.
The Fourier transform of the excited fields in the nonlinear saturated regime of the simulations is the theoretical counterpart to the measured ICE spectra. Multiple simulation runs for different, adjacent, values of the plasma density under KSTAR edge conditions enable us to infer the theoretical dependence of ICE spectral structure on the local electron number density.