Modelling the Turbulent Transport of Angular Momentum in Tokamak Plasmas - A Quasi-linear Gyrokinetic Approach PDF Download
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Author: Pierre Cottier
Publisher:
ISBN:
Category :
Languages : en
Pages : 118
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Book Description
Author: Pierre Cottier
Publisher:
ISBN:
Category :
Languages : en
Pages : 118
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Book Description
Author: Pierre Cottier
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659411038
Category :
Languages : en
Pages : 128
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Book Description
The magnetic confinement in tokamaks is for now the most advanced way towards energy production by nuclear fusion. Both theoretical and experimental studies showed that rotation generation can increase its performance by reducing the turbulent transport in tokamak plasmas. The rotation influence on the heat and particle fluxes is studied along with the angular momentum transport with the quasi-linear gyro-kinetic eigenvalue code QuaLiKiz. For this purpose, the QuaLiKiz code is modified in order to take the plasma rotation into account and compute the angular momentum flux. It is shown that QuaLiKiz framework is able to correctly predict the angular momentum flux including the ExB shear induced residual stress as well as the influence of rotation on the heat and particle fluxes. The different contributions to the turbulent momentum flux are studied and successfully compared against both non-linear gyro-kinetic simulations and experimental data.
Author: Alessandro Casati
Publisher:
ISBN:
Category :
Languages : en
Pages : 121
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Book Description
Le développement d'un modèle de transport gyrocinétique quasi-linéaire pour les plasmas de tokamak, conçu pour fournir des prévisions physiquement fiables des quantités thermodynamiques pertinentes, est une tâche qui a exigé des liens étroits entre les études théoriques, expérimentales et numériques. Le cadre du modèle ici développé, Qualikiz, qui exploite une réduction de complexité par rapport à la dynamique non-linéaire du plasma, permet de multiples validations de la compréhension actuelle de la micro-turbulence dans les tokamaks. Les principaux résultats de cette thèse découlent des étapes fondamentales de la formulation du modèle de transport quasi-linéaire, c'est-à-dire : (1) la vérification de la réponse quasi-linéaire contre les résultats numériques non-linéaires, (2) l'amélioration du modèle de la saturation grâce à une validation quantitative des codes non-linéaires contre les mesures de turbulence, (3) l'intégration du modèle quasi-linéaire dans un solveur de transport intégré.
Author: Camille Gillot
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Optimal control of tokamak plasmas requires efficient and accurate prediction of heat and matter transport. Growing from kinetic resonant instabilities, turbulence saturates by involving many scales, from the small vortex up to the back-reaction on the density and temperature profiles. Self-organisation processes are of particular interest, encompassing spontaneous zonal flow genera- tion and transport by avalanche. First principle numerical simulation codes like GYSELA allow studying the gyro-kinetic evolution of the particle distribution function. The large model size and cost prompts the need for reduction. Removing velocity dimensions is the so-called collisionless closure problem for fluid equations. Earlier approaches are extended and generalised by calling to the dynamical systems and optimal control litterature. In particular, we apply the balanced truncation and rational interpolation to the one-dimensional linear VlasovPoisson problem. The interpolation method features a cheap and versatile formulation, opening the door to wider use for more complex phenomena. Quasi-linear theory is the reference model for turbulent effects. The GYSELA three-dimensional output is analysed to estimate the robustness of linear properties in turbulent filaments. Key quasi-linear quantities carry over to the non-linear regime. Effective velocities and shape of turbulent structures are computed, and match expected group velocities and linear eigenmode. Nevertheless, the turbulent potential spectrum must be specified externally to quasi- linear models. This results in radially travelling unstable linear solutions that share many properties of turbulent avalanches seen in numerical simulations.
Author: Emil Fransson
Publisher:
ISBN: 9789179058395
Category : Magnetohydrodynamics
Languages : en
Pages : 0
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Author: Francis James Casson
Publisher:
ISBN:
Category :
Languages : en
Pages : 294
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Book Description
Author: Thibaut Vernay
Publisher:
ISBN:
Category :
Languages : en
Pages : 202
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Book Description
Author: Ronald E. Waltz
Publisher:
ISBN:
Category : Plasma turbulence
Languages : en
Pages : 210
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Book Description
Author: Andreas Skyman
Publisher:
ISBN: 9789173859615
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 92505
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Book Description
A general geometry gyro-kinetic model for particle simulation of plasma turbulence in tokamak experiments is described. It incorporates the comprehensive influence of noncircular cross section, realistic plasma profiles, plasma rotation, neoclassical (equilibrium) electric fields, and Coulomb collisions. An interesting result of global turbulence development in a shaped tokamak plasma is presented with regard to nonlinear turbulence spreading into the linearly stable region. The mutual interaction between turbulence and zonal flows in collisionless plasmas is studied with a focus on identifying possible nonlinear saturation mechanisms for zonal flows. A bursting temporal behavior with a period longer than the geodesic acoustic oscillation period is observed even in a collisionless system. Our simulation results suggest that the zonal flows can drive turbulence. However, this process is too weak to be an effective zonal flow saturation mechanism.
