Tokamak Plasmas
Nonlinear Kinetic Ion Response to Small Scale Magnetic Islands in Tokamak Plasmas : Neoclassical Tearing Mode Threshold Physics
... (Received 13 April 2018; revised manuscript received 7 August 2018; published 24 October 2018) A new drift-kinetic theory of the ion response to magnetic islands in tokamak plasmas is presented. Small ...
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The response of toroidal drift modes to profile evolution : A model for small-ELMs in tokamak plasmas?
... Abstract. We consider a time-dependent linear global electrostatic toroidal fluid ion-temperature gradient (ITG) model to study the evolution of toroidal drift modes in tokamak plasmas as the equilibrium ...
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Collisional transport of trace impurity ions and the role of the radial electric field in spherical tokamak plasmas
... Throughout the discussion of the radial electric field in the present work it was assumed that the pressure gradient term in the momentum balance equation (5.1) was the dominant contribution to the radial electric field. ...
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Scattering of ECRF waves by edge density blobs and fluctuations in tokamak plasmas
... Abstract. There are two basic approaches to studying the effects of density blobs and edge fluctuations on the coupling of electron cyclotron (EC) radio frequency waves to the core of tokamak plasmas. The ...
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Transitions to improved confinement regimes induced by changes in heating in zero dimensional models for tokamak plasmas
... large tokamak plasmas, including DIII-D[17], JT-60U[18], Alcator C-Mod[19] and ASDEX-U[20], and in a range of tritium, deuterium-tritium and hydrogen plasmas in ...
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Turbulent transport in rotating tokamak plasmas
... in tokamak plasmas have become increasingly sophisticated, with increased computa- tional power allowing many new physical effects to be ...rotating plasmas, through the inclusion of the centrifugal ...
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Formulation of Two-Dimensional Transport Modeling in Tokamak Plasmas
... A two-dimensional transport modeling applicable to a whole tokamak plasma is proposed. The model is de- rived from the multi-fluid equations and Maxwell’s equations and the moment approach of neoclassical ...
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Non linear instabilities in the edge of tokamak plasmas : characterization of edge localized modes and numerical simulation of blob dynamics using a hybrid model
... general plasmas and fusion experiments is crucial for the evolution of current experiments and for the general ...among tokamak toroidal geometries and divertor system, which is found to also play a role to ...
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Structure of micro-instabilities in tokamak plasmas: Stiff transport or plasma eruptions?
... (Received 14 November 2013; accepted 20 December 2013; published online 8 January 2014) Solutions to a model 2D eigenmode equation describing micro-instabilities in tokamak plasmas are presented that ...
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Dissertation 10. Fast ions and momentum transport in JET tokamak plasmas. Antti Salmi
... analysed plasmas were with type III ELMs and the NTM activity varied from zero to very mild, thus the torque originating from these is negligible as compared with the large NBI ...
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Fast particle driven ion cyclotron emission (ICE) in tokamak plasmas and the case for an ICE diagnostic in ITER
... The detection of fast particle-driven waves in the ion cyclotron frequency range (ion cyclotron emission or ICE) could provide a passive, non-invasive diagnostic of confined and escaping fast particles (fusion ...
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Sub microsecond temporal evolution of edge density during edge localized modes in KSTAR tokamak plasmas inferred from ion cyclotron emission
... KSTAR tokamak has per- formed a series of experimental campaigns aimed at advancing the current understanding of ELMs A thor- ough account of ELM dynamics in KSTAR can be found in ...
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Radial Electric Field in Tokamak Plasmas as a Physical Consequence of Ehrenfest’s Paradox
... stationary tokamak chamber in the laboratory frame, Equation ...the tokamak plasma in the laboratory frame, and can use the Poisson equation with taken from Equation (6) to calculate the electrostatic ...
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2D full-wave simulation of waves in space and tokamak plasmas
... In this figure, we define that r and z are radial and vertical directions of the tokamak, respectively, while ϕ is a toroidal direction. For the FW2D simulation, we adopt radial direction between 0.8m < r < ...
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MHD Instabilities in Tokamak Plasmas with Hollow Current Density Profiles
... If the toroidal current density profile of a plasma is hollow, the safety factor q profile is nonmonotonic, and the magnetic shear is negative in the central region. The for- mation of transport barriers has been ...
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Fluid descriptions of externally heated tokamak plasmas
... fusion plasmas, the fast ions generated by external heating methods as well as fusion reactions can drive one or many waves, making them unstable through the wave- particle ...
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Particle and Momentum Transport in Tokamak Plasmas, the Complicated Path towards the Experimental Validation of the Theoretical Predictions of Transport in Fusion Plasmas
... H-mode plasmas) this de- pendence was not observed ...H-mode plasmas, the density peaking was decreasing with increasing elec- tron collisionality [48, 49, ...
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A Kinetic Study of Microwave Start-up of Tokamak Plasmas
... Non-inductive plasma current start-up is a very important area of research for the spherical tokamak (ST) due to a lack of space for a shielded inboard solenoid. Reliable models are needed to predict performance ...
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Interpretation of suprathermal emission at deuteron cyclotron harmonics from deuterium plasmas heated by neutral beam injection in the KSTAR tokamak
... The ICE physics addressed in this paper and in Refs. [10, 11, 45, 46], would have gone unnoticed had it not been for KSTAR’s sophisticated RF system and high speed digitizer [43]. Their uniquely high time resolution has ...
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Integrated Modeling of Whole Tokamak Plasma
... advanced tokamak plasmas, characterized by high values of normalized beta, a fraction of self-generated bootstrap current, a confinement enhancement factor and so on, have progressed in JT-60U ...advanced ...
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