Author: S. I. KrasheninnikovPublisher:
ISBN:
Category :
Languages : en
Pages : 22
Book Description
Plasma-neutral Interaction in Tokamak Divertor for "gas Box" Neutral Model
Author: S. I. KrasheninnikovUnderstanding of Neutral Gas Transport in the Alcator C-Mod Tokamak Divertor
Author: D. P. StotlerUnderstanding of Neutral Gas Transport in the Alcator C-Mod Tokamak Divertor
Author: D. P. StotlerCoupled Two-dimensional Edge Plasma and Neutral Gas Modeling of Tokamak Scrape-off-layers
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 158
Book Description
The objective of this study is to devise a detailed description of the tokamak scrape-off-layer (SOL), which includes the best available models of both the plasma and neutral species and the strong coupling between the two in many SOL regimes. A good estimate of both particle flux and heat flux profiles at the limiter/divertor target plates is desired. Peak heat flux is one of the limiting factors in determining the survival probability of plasma-facing-components at high power levels. Plate particle flux affects the neutral flux to the pump, which determines the particle exhaust rate. A technique which couples a two-dimensional (2-D) plasma and a 2-D neutral transport code has been developed (coupled code technique), but this procedure requires large amounts of computer time. Relevant physics has been added to an existing two-neutral-species model which takes the SOL plasma/neutral coupling into account in a simple manner (molecular physics model), and this model is compared with the coupled code technique mentioned above. The molecular physics model is benchmarked against experimental data from a divertor tokamak (DIII-D), and a similar model (single-species model) is benchmarked against data from a pump-limiter tokamak (Tore Supra). The models are then used to examine two key issues: free-streaming-limits (ion energy conduction and momentum flux) and the effects of the non-orthogonal geometry of magnetic flux surfaces and target plates on edge plasma parameter profiles.
Fusion Energy 1996
Author: Publisher:
ISBN:
Category : Controlled fusion
Languages : en
Pages : 1030
Book Description
Proceedings of the Sixteenth International Conference, formerly called the International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Montreal, 7-11 October 1996. The papers presented reflect the excellent progress achieved since the last conference in Seville 1994. Among many other achievements, the Tokamak Fusion Test Reactor has produced over 10 MW of fusion power, the JT-60U experiment has demonstrated plasma conditions equivalent to breakeven, the reversed shear mode has been demonstrated, low aspect ratio tokamaks have produced promising results and plans have been drawn up for powerful new inertial confinement fusion experiments.
Comparison of Neutral Gas Models for Divertor Plasmas
Author: Studying Divertor Relevant Plasmas in Linear Devices
Author: Karol JeskoPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Predictions for the operation of tokamak divertors typically rely on edge transport codes, consisting of a fluid plasma code in combination with a Monte Carlo code for neutral species. The linear devices Magnum-PSI and Pilot-PSI at DIFFER, operating with a cascaded arc plasma source that produces plasmas comparable to those expected in the ITER divertor (Te ∼ 1 eV, n_e ∼ 1020 m−3). In this thesis, plasma discharges have been studied both experimentally and by modelling using the Soledge2D-Eirene code in order to a) investigate which phenomena need to be included in the modeling to reproduce experimental trends and b) provide new insights to the interpretation of experiments. Experimentally, the effect of neutral pressure Pn was investigated using Thomson scattering, a Langmuir probe, visible spectroscopy and calorimetry. We have shown that a plasma beam can be effectively terminated by a blanket of neutral gas. Next, from comparisons of experiments and simulations, we have found that it is critical to include elastic collisions between the plasma and molecules if experiments are to be reproduced. Furthermore, the near-target Te is systematically overestimated by the code, underestimating the recombination rate thereby. Lastly, we have experimentally shown the importance of the inclusion of surface recombination to the surface energy flux in low temperature plasmas, an effect that is generally known but difficult to measure in fusion devices. The work presented in this thesis contributes to the understanding of plasma-neutral interactions especially in new generation, closed divertor concepts (i.e. MAST-upgrade, DIII-D).
Atomic Processes in Plasmas
Author: David R. SchultzPublisher: American Inst. of Physics
ISBN: 9780735400900
Category : Science
Languages : en
Pages : 328
Book Description
The APS Topical Conference on Atomic Processes in Plasmas brings together researchers working in atomic physics and in plasma science, emphasizing the strong and synergistic overlap of these fields. The latest developments in atomic physics reported are recent advances in plasma science, such as in magnetic or inertial confinement fusion, Z-pinches, astrophysics, and technical plasma processing.
Author: 
Author: G.A. Emmert