Sökning: "hot electrons"
Visar resultat 16 - 20 av 38 avhandlingar innehållade orden hot electrons.
16. A Simulation Approach to High-Frequency Plasma Waves
Sammanfattning : Electrostatic waves in the form of Broadband Electrostatic Noise (BEN) have been observed in the Earth's auroral region associated with high geomagnetic activity. This broad frequency spectrum consists of three electrostatic modes, namely electron plasma, electron acoustic and beam-driven modes. LÄS MER
17. Multi-messenger emission from gamma-ray bursts
Sammanfattning : Multi-messenger astronomy is a very hot topic in the astrophysical community. A messenger is something that carries information. Different astrophysical messenger types are photons, cosmic rays, neutrinos, and gravitational waves. They all carry unique and complementary information to one another. LÄS MER
18. Intense laser-plasma interactions
Sammanfattning : In the interaction of ultra-intense laser fields with matter, the target is rapidly ionized and a plasma is formed. The ability of a plasma to sustain acceleration gradients, orders of magnitude larger than achievable with conventional accelerators, has led to a great interest in laser-driven plasma-based particle and radiation sources, with applications in materials science, biology and medicine. LÄS MER
19. The Struggles of Light Bound in Matter : Modelling Optical Excitations in Nanostructures
Sammanfattning : This thesis addresses three different topics on the interaction between light and matter in open quantum systems. The first topic concerns two-dimensional spectroscopy and the spectral contributions from different nonlinear action signals with a focus on how to differentiate between them. LÄS MER
20. Development and Applications of a Laser-Wakefield X-ray Source
Sammanfattning : In laser-wakefield acceleration (LWFA), a femtosecond laser pulse is tightly focused in a gas to intensities exceeding 1018 W/cm2 . The laser radiation ionizes the medium and excites a plasma wave that travels behind the laser pulse. LÄS MER