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Visar resultat 1 - 5 av 416 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. High Power Microwave Sources : design and experiments

    Författare :Cecilia Möller; Nils Brenning; Stefan Silfverskiöld; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Space physics; Rymdfysik; Plasma physics; Plasmafysik;

    Sammanfattning : High-Power Microwaves (HPM) can be used to intentionally disturb or destroy electronic equipment at a distance by inducing high voltages and currents. This thesis presents results from experiments with a narrow band HPM source, the vircator. LÄS MER

  3. 2. Evaluation of different topologies for high-power dc-dc converters

    Författare :Georgios D. Demetriades; KTH; []
    Nyckelord :dc-dc power converter; high-power; high-frequency; bi-directional power flow; half-bridge configuration; component stresses; galvanic isolation;

    Sammanfattning : .... LÄS MER

  4. 3. Optically pumped semiconductor disk lasers for high-power wide wavelength tuning

    Författare :Carl Borgentun; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; beam characterization; design; high power; wavelength tuning; Semiconductor laser; gain measurements; vertical-external-cavity surface-emitting laser; optically pumped semiconductor disk laser;

    Sammanfattning : In this work I present and verify a strategy that makes it possible to change the wavelength, or color, of an external cavity semiconductor laser over a very large range. This is achieved by a careful design and thorough optimization of the active component — the gain element of the laser. LÄS MER

  5. 4. Fundamentals of High Power Impulse Magnetron Sputtering

    Författare :Johan Böhlmark; Ulf Helmersson; André Anders; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Plasma; Pulsed plasma; High Power Pulsed Magnetron Sputtering; Plasma Characterization; Physics; Fysik;

    Sammanfattning : In plasma assisted thin film growth, control over the energy and direction of the incoming species is desired. If the growth species are ionized this can be achieved by the use of a substrate bias or a magnetic field. Ions may be accelerated by an applied potential, whereas neutral particles may not. LÄS MER

  7. 5. Design and Experiments with High Power Microwave Sources : The Virtual Cathode Oscillator

    Författare :Cecilia Möller; Nils Brenning; Stefan Silfverskiöld; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High Power Microwaves Vircator;

    Sammanfattning : High-Power Microwaves (HPM) can be used to intentionally disturb or destroy electronic equipment at a distance by inducing high voltages and currents.This thesis presents results from simulations and experiments with a narrow band HPM source, the vircator. LÄS MER