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Showing result 1 - 5 of 7 essays matching the above criteria.

  1. 1. Development of a model for ionospheric instabilities in the equatorial region

    University essay from Luleå tekniska universitet/Rymdteknik

    Author : Thea Lepage; [2023]
    Keywords : ;

    Abstract : This work is part of a bigger project on analyzing the ionospheric dynamics in the equatorial region using simulations. The main objective of this study is to determine and characterize the parameters needed to trigger instabilities and thus the formation of plasma bubbles. READ MORE

  3. 2. Use of the JET pedestal database to assess the role of ion temperature and plasma rotation on the discrepancy between ideal peeling-ballooning model and experimental data

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Max Eichenberger; [2022]
    Keywords : Nuclear fusion; Joint European Torus JET ; H-mode; pedestal; Edge-localized-modes ELMs ; Peeling-Ballooning; relative shift; ion temperature; plasma rotation; Kärnfusion; JET Joint European Torus ; H-läge; piedestal; ELM Edge Localized­Modes ; peeling-ballooning; relativ förskjutning; jontemperatur; plasmarotation;

    Abstract : Next-generation and present fusion devices such as the Joint European Torus (JET) aim for plasma operations in H-mode, a plasma regime with high confinement and low loss of energy and fuel that results from a barrier for heat and particle transport at the plasma edge, the pedestal. Due to steep gradients of the density, temperature and pressure profiles, the pedestal experiences instabilities called Edge-localized-modes (ELMs) which lead to large fluxes of heat and particles that might damage machine components. READ MORE

  4. 3. Čerenkov emission of whistler waves by electron holes

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Nedjma Ouahioune; [2021]
    Keywords : Čerenkov; Whistler waves; Resonance; Electron holes; Plasma; Physics; Space Physics; Astronomy; Plasma waves; Instabilities; Čerenkov; visslarvågor; elektromagnetiska vågor; resonans; electron holes; plasma fysisk; rymdfysisk; astronomi; plasma vågor; instabilitet;

    Abstract : Electron holes are positively charged nonlinear structures in which trapped electrons are supported by a positive electrostatic potential. These structure are regularly observed in space and laboratory plasmas by means of diverging bipolar electric field signatures. READ MORE

  5. 4. Ion Cyclotron Resonance Heating in WEST

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Elvis Rodas; [2019]
    Keywords : tokamak; WEST; ICRH; FEMIC.;

    Abstract : In a fusion power plant the plasma must be confined to prevent instabilities and energy loss. The confinement machine studied is a tokamak. The focus of the project is to optimize ion resonance heating in WEST. READ MORE

  6. 5. Implementation of Fast Real-Time Control of Unstable Modes in Fusion Plasma Devices

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Martin Lundberg; [2017]
    Keywords : Fusion plasma; MHD control; CUDA;

    Abstract : In recent years, multi-core graphics processing units (GPUs) have been increasingly used by researchers for other purposes than rendering graphics. This thesis presents the implementation of GPU computing for real-time control of plasma instabilities known as resistive wall modes at the EXTRAP T2R fusion plasma device. READ MORE