Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"laser plasma interactions"”.
-
Collective charged particle dynamics in relativistically transparent laser-plasma interactions
… to the interaction of ultra-intense (10²⁰ Wcm⁻²) laser with ultra-thin (nanometre scale) foils undergoing expansion and relativistic induced transparency. The onset of this relativistic mechanism is also characterised and studied in detail. This new insight into relativistic transparency is an …
-
Bremsstrahlung radiation and fast electron transport in laser-plasma interactions
… using high-intensity (> 1018W/cm2) lasers pulses to ionise and accelerate electrons from thick solid targets in order to generate a bright bremsstrahlung source. Throughout the work the focus has been, firstly, to better understand the process behind the generation of x-rays within …
-
Investigation and characterization of single hot spot laser-plasma interactions
Control of parametric laser-plasma interactions (LPI) is essential to the success of inertial confinement fusion (ICF). Through a research collaboration with the Los Alamos National Laboratory (LANL), we have had the opportunity to participate in world-class laser-plasma experiments. The goal of …
-
On The Origin of Super-Hot Electrons in Intense Laser-Plasma Interactions
This thesis investigates the ultraintense laser-plasma interaction. An experiment to measure the generation of relativistic electrons and positrons was performed at the Texas Petawatt laser which resulted in the observation of the highest known positron energies ever recorded. The positrons are …
-
Spectrum and conversion efficiency measurements of suprathermal electrons from relativistic laser plasma interactions
… Confinement Fusion (ICF) that uses a petawatt laser to ignite a hot spot in precompressed fuel. The laser delivers its energy into relativistic electrons at the critical surface of the blowoff plasma. These electrons must propagate to the fuel core and deliver their energy to a hot spot. …
-
Experimental investigation of the emission of high-brightness extreme ultraviolet radiation from laser-plasma interactions
The laser wakefield accelerator is a novel particle accelerator that takes advantage of the large electric fields generated by separating oppositely charged particles in plasma. The ponderomotive force of an intense, ultra-short duration, laser pulse drives density waves in under-dense plasma to …
-
Coupled modes analysis of SRS backscattering, with Langmuir decay and possible cascadings
… stimulated Raman scattering (SRS) in ICF laser-plasma interactions, suggest that SRS is coupled to the Langmuir decay interaction (LDI). The effects of LDI on the saturation of the SRS backscattering have been investigated, considering typical parameters from recent experiments. Detailed …
-
Characterization of mono-energetic charged-particle radiography for high energy density physics experiments
… Fusion capsules during their implosions, Laser-Plasma Interactions, and Rayleigh-Taylorinstability growth. An imploded D23He-filled glass capsule - the backlighter - provides monoenergetic 15-MeV and 3-MeV protons and 3.6-MeV alphas for radiographing these various phenomena. Because the …
-
Fast-ion spectrometry of ICF implosions and laser-foil experiments at the omega and MTW laser facilities
Fast ions generated from laser-plasma interactions (LPI) have been used to study inertial confinement fusion (ICF) implosions and laser-foil interactions. LPI, which vary in nature depending on the wavelength and intensity of the driver, generate hot electrons with temperatures ranging from tens to …
-
Laser-driven beams of fast ions, relativistic electrons and coherent x-ray photons
… electrons and coherent x-rays, driven by intense laser-plasma interactions. The rapid development of high-power, short-pulse laser systems have made available peak powers reaching the petawatt regime and focused intensities reaching 10^21 W/cm2. When interacting with matter, the extreme energy …
-
EMP mitigation and novel detection strategies for laser-plasma experiments
Laser driven particle and radiation sources have the potential to become an alternative to conventional accelerators for a number of applications. Many laser-driven sources have been demonstrated, including x-rays, protons, electrons and positrons. The laser driven production of exotic particles …
-
Laser-Matter Interactions at Extreme Irradiance: X-ray Generation and Relativistic Channelling
… work in which the powerful Ti:sapphire lasers at the High Power Laser Facility at the Lund Laser Centre have been employed to investigate laser-produced X-rays and relativistic channelling. These lasers produce short pulses, of the order of 50 fs, with energies ranging from 1 mJ to 1 J. …
-
Multi-scale modeling of laser induced breakdown in non-equilibrium plasmas
… modeling of breakdown of gases under nano-second laser discharges, the plasma kernel dynamics, the plasma core decay, and the subsequent post-dischargee hydrodynamics, together with some of its engineering applications (e.g., flow control and ignition of combustible mixtures). A non-equilibrium …
-
Second Harmonic Generation Stimulated Electromagnetic Emissions during High Power High Frequency Radio Wave Interaction with the Ionosphere
… evolution of the modified ionospheric plasma. Classic SEEs which exist outside ±1 kHz of the pump wave frequency (ω0) have recently been classified into wideband SEEs (PW-WSEEs) and distinguished from narrowband SEEs (PW-NSEEs) which exist within ±1 kHz of ω0, where the "PW" prefix has …