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Showing 1 to 16 of 16 for “"Laser Plasma Interaction"”.
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Effects of Radiation Damping in Extreme Ultra-intense Laser-Plasma Interaction
… in the development of intense short pulse lasers are significant. Now it is available to access a laser with intensity 1021 W/cm2 by focusing a petawatt class laser. In a few years, the intensity will exceed 1022 W/cm2, at which intensity electrons accelerated by the laser get energy more …
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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 …
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Acceleration of heavy Ions to MeV/nucleon Energies by Ultrahigh-Intensity Lasers
… heavy ions to multi-MeV energies by means of a laser is demonstrated for the first time. Using an ultrahigh-intensity laser, with focal intensities exceeding 5 x 10^19 W/cm^2, the laser-plasma interaction becomes relativistic and a strong electron current is driven in laser direction. These …
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Laser-driven electron acceleration in infinite vacuum
I first review basic models for laser-plasma interaction that explain electron acceleration and beam confinement in plasma. Next, I discuss ponderomotive electron acceleration in infinite vacuum, showing that the transverse scattering angle of the accelerated electron may be kept small with a …
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Characterisation and Measurement of Laser Produced Plasma Emission and Applications in Opacity Experiments
… this thesis investigates the characterization of laser produced plasmas and develops applications in opacity experiments using plasma emission as a back-lighting source. A diagnostic is developed to analyse bremsstrahlung emission from hot electrons produced in the laser plasma interaction. …
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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. …
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The role of near time coherent contrast on ultrafast laser driven radiation sources
… results from two campaigns using the Gemini laser system at RAL and the JETI 40 laser in Jena. Simulations using EPOCH are also presented. The overall theme is the effect of near time, femtosecond - tens of picoseconds, contrast on different mechanisms produced by laser - plasma …
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The interaction of infra-red laser radiation with solid targets
The pulsed HF chemical laser was discovered in 1966 by Deutsch. Early lasers had very low power outputs; it is only more recently that high power pulsed HF/DF lasers have emerged. This thesis is concerned with the development of a 10J HF laser in 1976 and subsequent interaction experiments. The …
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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 …
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Effects of Laser Frequency and Multiple Beams on Hot Electron Generation in Fast Ignition
… thousand times solid density with ultra-intense lasers. In the fast ignition (FI) scheme, a picosecond petawatt laser pulse is used to deposit ∼10 kJ of energy in ∼10 ps into a small hot-spot at the periphery of the compressed core, igniting a fusion burn wave. FI promises a much higher …
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DIAGNOSTICS AND REAL-TIME MONITORING OF PULSED LASER ABLATION
… and real-time monitoring during pulsed laser ablation of solid materials are investigated. It is found that acoustic, optical and electric signals generated are closely related to laser processing conditions, material surface and bulk properties. A wide band microphone is used to record …
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Exact Analysis of Hot Electrons Produced by Resonant Absorption in Laswer-Plasma Interaction
Made available in DSpace on 2017-07-06T18:59:16Z (GMT). No. of bitstreams: 3 Venkatesan_Ravi_C_MS.pdf: 34983848 bytes, checksum: 3cf09a3c8324e50afef3b7ec2aa01bfc (MD5) Venkatesan_Ravi_C_MS_ABS.pdf: 560564 bytes, checksum: 6908688b5adcd75d91b0989e00ce6fa2 (MD5) license.txt: 4813 bytes, checksum: …
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Experimental measurements and Monte Carlo simulations of a transport beamline for laser-driven proton beams
… the most attractive topics in the relativistic laser-plasma interaction research, opening the possibility to investigate innovative regimes and different potential applications. In particular, it is becoming evident that, in the next future, laser-driven acceleration could represent an effective …
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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 …
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Compact neutron sources for Nuclear Physics: from accelerator-based to laser-driven neutron beams
… of these techniques. In this context, laser-driven ion sources are garnering the interest of the nuclear physics community due to the fast development of ultra-short (~fs) and ultra-high power (> 1019 W/cm2) lasers and their applications as compact particle accelerators. Laser-driven …
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Transition from transparency to hole-boring in relativistic laser-solid interactions at the Texas Petawatt
… of the electron critical density surface during interactions between a relativistically intense laser pulse and a solid density target. On short time scales the laser field increases the electron quiver velocity, increasing the effective electron mass which increases the plasma frequency at a …