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Study Of Supra Thermal Electrons And K Alpha X Rays From High Intensity 500 Fs Laser Produced Plasmas
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Book Synopsis Study of Supra-thermal Electrons and K-[alpha] X-rays from High Intensity 500 Fs Laser-produced Plasmas by :
Download or read book Study of Supra-thermal Electrons and K-[alpha] X-rays from High Intensity 500 Fs Laser-produced Plasmas written by and published by . This book was released on 1995 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe recent laser-solid interaction experiments using the 500 fs Janus Nd:glass (1053 nm) laser presently at 1.5 TW power level. The laser beam path is enclosed in vacuum from the compressor to the target and is focused using an off-axis paraboloid. Optical diagnostics monitor the near field pattern, focal spot, spectrum, temporal shape and pre-pulse level. A 12 [mu]m diameter (FWHM) focal spot is achieved (2.5 × diffraction limit) corresponding to a peak irradiance of 8 × 1017 W cm−2 on target. A suite of x-ray diagnostics characterize the x-ray emission from the plasma. We present results for normal incidence irradiation of high-Z (Zn, Ge, Mo, Sn) solid targets. The supra-thermal electrons produced in the short scale length plasma have temperature T{sub H}> 100 keV and can efficiently fluoresce the cold K-[alpha] lines in the 8--30 keV energy range.
Book Synopsis X-Ray Lasers 1996 by : Sune Svanberg
Download or read book X-Ray Lasers 1996 written by Sune Svanberg and published by CRC Press. This book was released on 1996-01-01 with total page 1162 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-Ray Lasers 1996 provides not only an overview and progress report on this fast moving field, but also important reference material on which future work can be built. Topics covered include collisional x-ray lasers, table-top x-ray lasers, beam optics, x-ray optics, OFI and photo-pumped schemes, capillary schemes, international laser facilities, XUV nonlinear mixing, alternative soft x-ray sources, diagnostics, and applications. The volume is an essential addition to the libraries of researchers in the field.
Book Synopsis Advances In Laser Interaction With Matter And Inertial Fusion by : G Velarde
Download or read book Advances In Laser Interaction With Matter And Inertial Fusion written by G Velarde and published by World Scientific. This book was released on 1997-12-04 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book collects together theoretical and experimental contributions on laser-plasma interaction and dynamics, together with the physics of laser fusion, coronal, hydrodynamics (instabilities), radiation hydrodynamics and atomic physics. Theory and experiments are reviewed. In addition to diagnostics, indirect drive modeling and experiments are reported, as well as approaches of direct drive foam-buffered targets for uniform compression. New ideas on triggering ignition and use of advanced fuels for neutronless fusion are also reported. The short-pulse ultra-intense laser interaction is extensively represented both theoretically and experimentally. The two major laser-fusion ignition projected facilities (2 MJ class). National Ignition Facility (NIF) / USA and Laser Megajoule (LMJ) / France, are also disscused.
Book Synopsis Laser Interaction and Related Plasma Phenomena by : Miley
Download or read book Laser Interaction and Related Plasma Phenomena written by Miley and published by American Institute of Physics. This book was released on 1997 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering topics discussed at the 13th Internaional Conference, this book gives an in-depth look at topics including: laser design, alternate concepts in alternate clusters, nuclear-pumped lasers, alternate fast ignitors, heavy ion fusion, laser-ion beam interactions, target physics, interaction physics, extreme short-pulse interactions, high-energy-density plasma physics, astrophysics, and hydrodynamic instabilities.
Book Synopsis Suprathermal Electrons in KJ-laser Produced Plasmas: M- Shell Resolved High-resolution X-ray Spectroscopic Study of Transient Matter Evolution by :
Download or read book Suprathermal Electrons in KJ-laser Produced Plasmas: M- Shell Resolved High-resolution X-ray Spectroscopic Study of Transient Matter Evolution written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 20-100 KeV K[alpha] X-Ray Source Generation by Short Pulse High Intensity Lasers by :
Download or read book 20-100 KeV K[alpha] X-Ray Source Generation by Short Pulse High Intensity Lasers written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We are studying the feasibility of utilizing K[alpha] x-ray sources in the range of 20 to 100 keV as a backlighters for imaging various stages of implosions and high areal density planar samples driven by the NIF laser facility. The hard x-ray K[alpha] sources are created by relativistic electron plasma interactions in the target material after a radiation by short pulse high intensity lasers. In order to understand K[alpha] source characteristics such as production efficiency and brightness as a function of laser parameters, we have performed experiments using the 10 J, 100 fs JanUSP laser. We utilized single-photon counting spectroscopy and x-ray imaging diagnostics to characterize the K[alpha] source. We find that the K[alpha] conversion efficiency from the laser energy is ≈ 3 x 10−4.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1996 with total page 1428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis K-alpha X-ray and Hot Electron Emission from Microjoule Femtosecond Laser Produced Plasmas by : Cristina Serbanescu
Download or read book K-alpha X-ray and Hot Electron Emission from Microjoule Femtosecond Laser Produced Plasmas written by Cristina Serbanescu and published by . This book was released on 2007 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book פרוש המשנה written by and published by . This book was released on 1485 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindex written by and published by . This book was released on 1996 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamics of Ultrafast Laser-produced Plasmas by : Thomas David Donnelly
Download or read book Dynamics of Ultrafast Laser-produced Plasmas written by Thomas David Donnelly and published by . This book was released on 1995 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of Volumetrically Heated Ultra-High Energy Density Plasmas by :
Download or read book Study of Volumetrically Heated Ultra-High Energy Density Plasmas written by and published by . This book was released on 2016 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heating dense matter to millions of degrees is important for applications, but requires complex and expensive methods. The major goal of the project was to demonstrate using a compact laser the creation of a new ultra-high energy density plasma regime characterized by simultaneous extremely high temperature and high density, and to study it combining experimental measurements and advanced simulations. We have demonstrated that trapping of intense femtosecond laser pulses deep within ordered nanowire arrays can heat near solid density matter into a new ultra hot plasma regime. Extreme electron densities, and temperatures of several tens of million degrees were achieved using laser pulses of only 0.5 J energy from a compact laser. Our x-ray spectra and simulations showed that extremely highly ionized plasma volumes several micrometers in depth are generated by irradiation of gold and Nickel nanowire arrays with femtosecond laser pulses of relativistic intensities. We obtained extraordinarily high degrees of ionization (eg. we peeled 52 electrons from gold atoms, and up to 26 electrons from nickel atoms). In the process we generated Gigabar pressures only exceeded in the central hot spot of highly compressed thermonuclear fusion plasmas. The plasma created after the dissolved wires expand, collide, and thermalize, is computed to have a thermal energy density of 0.3 GJ cm-3 and a pressure of 1-2 Gigabar. These are pressures only exceeded in highly compressed thermonuclear fusion plasmas. Scaling these results to higher laser intensities promises to create plasmas with temperatures and pressures exceeding those in the center of the sun.
Download or read book X-Ray Lasers 2006 written by P.V. Nickles and published by Springer Science & Business Media. This book was released on 2008-01-18 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: The search for table-top and repetitive pump schemes during the last decade has been the driving force behind the spectacular advances demonstrated during the 10th International Conference on X-Ray Lasers, organized in 2006 in Berlin. The proceedings of this series of conferences constitute a comprehensive source of reference of the acknowledged state-of the-art in this specific area of laser and plasma physics.
Book Synopsis Nonlinear Increase of X-ray Intensities from Thin Foils Irradiated with a 200 TW Femtosecond Laser by :
Download or read book Nonlinear Increase of X-ray Intensities from Thin Foils Irradiated with a 200 TW Femtosecond Laser written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report, for the first time, that the energy of femtosecond optical laser pulses, E, with relativistic intensities I> 1021 W/cm2 is efficiently converted to X-ray radiation, which is emitted by "hot" electron component in collision-less processes and heats the solid density plasma periphery. As shown by direct high-resolution spectroscopic measurements X-ray radiation from plasma periphery exhibits unusual non-linear growth ~E4-5 of its power. The non-linear power growth occurs far earlier than the known regime when the radiation reaction dominates particle motion (RDR). Nevertheless, the radiation is shown to dominate the kinetics of the plasma periphery, changing in this regime (now labeled RDKR) the physical picture of the laser plasma interaction. Although in the experiments reported here we demonstrated by observation of KK hollow ions that X-ray intensities in the keV range exceeds ~1017 W/cm2, there is no theoretical limit of the radiation power. Therefore, such powerful X-ray sources can produce and probe exotic material states with high densities and multiple inner-shell electron excitations even for higher Z elements. Femtosecond laser-produced plasmas may thus provide unique ultra-bright X-ray sources, for future studies of matter in extreme conditions, material science studies, and radiography of biological systems.
Book Synopsis Spectroscopic Investigations of Hard X-ray Emission from 120 Ps Laser-produced Plasmas at Intensities Near 10[sup 17] W Cm[sup[minus]2]. by :
Download or read book Spectroscopic Investigations of Hard X-ray Emission from 120 Ps Laser-produced Plasmas at Intensities Near 10[sup 17] W Cm[sup[minus]2]. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectroscopic investigations of the x-ray emission of plasmas heated by 120 ps, frequency doubled pulses from the JANUS Nd: glass laser are presented. High Z K-shell spectra emitted from slab targets heated to near 10[sup 17] W cm[sup[minus]2] intensity are investigated. High resolution ([gamma]/[Delta][gamma]>5000) x-ray spectra of multicharged ions of H-like Ti, Co, Ni, Cu, and also H-like Sc in the spectral range 1.5--3.0[angstrom] are obtained in single laser shots using a spherically bent Mica crystal spectrograph with a 186 mm radius of curvature. The spectra- have one dimensional spatial resolution of about 25[mu]m and indicate that the size of the emission zone of the resonance, transitions is25[mu]m. Simultaneous x-ray images of the plasma from a charge-coupled device pinhole camera confirmed that the plasma x-ray emission is from a similar sized source. Survey spectra[gamma]/[Delta][gamma]=500--1000) taken with a flat LiF (200) crystal spectrometer with a charge-coupled device detector complement the high resolution data. Two dimensional LASNEX modeling of the laser target conditions indicate that the high K-shell charge states are produced in the hot dense region of the plasma with electron temperature2 keV and density[approximately]10[sup 22] cm[sup[minus]3]. These experiments demonstrate that with modest laser energy, plasmas heated by high-intensity 120 ps lasers provide a very bright source of hard[approximately]8 keV x-ray emission.
Book Synopsis The Effects of Pre-formed Plasma on the Generation and Transport of Fast Electrons in Relativistic Laser-solid Interactions by : Bhooshan S. Paradkar
Download or read book The Effects of Pre-formed Plasma on the Generation and Transport of Fast Electrons in Relativistic Laser-solid Interactions written by Bhooshan S. Paradkar and published by . This book was released on 2012 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we present the dynamics of relativistic fast electrons produced in the laser-solid interactions at the intensities greater than 1018 W/cm2. In particular, the effects of pre-formed plasma in front of a solid target on the generation and transport of these fast electrons is studied. The presence of such a pre-formed plasma is ubiquitous in almost all the present short pulse high intensity laser-solid interaction experiments. First, the generation of fast electrons in the presence of pre-formed plasma of varying density scale-lengths is studied with the help of Particle In Cell (PIC) simulations. It is shown that the fast electrons energy increases with the increasing pre-formed plasma, consistent with the experimental observations. The possible mechanism of generation of such energetic electrons is studied. It is proposed that the interaction of plasma electrons with the laser in the presence of ambipolar electric field, generated due to the laser heating, can result in the electron acceleration beyond laser ponderomotive energy. The analytical and numerical studies of this heating mechanism are presented. In the second part of thesis, the influence of pre-formed plasma on the fast electrons transport is studied. Especially the physics of refluxing of these fast electrons due to the excitation of electrostatic sheath fields inside the pre-formed plasma is investigated. It is shown that this refluxing is responsible for the `annular ring shaped' copper K[alpha] x-ray emission observed in the recent high intensity laser-solid experiments.
Book Synopsis Theoretical Results Relating Experimental X-ray Spectra to the Number and Total Energy of Suprathermal Electrons in Laser-heated Plasmas by : Michael A. Stroscio
Download or read book Theoretical Results Relating Experimental X-ray Spectra to the Number and Total Energy of Suprathermal Electrons in Laser-heated Plasmas written by Michael A. Stroscio and published by . This book was released on 1976 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Formulas are derived which contain corrections to previous work and relate the x-ray spectrum produced from a laser-heated plasma to the number and total energy of suprathermal electrons in the plasma. These formulas, together with experimental x-ray spectra, have been used to determine the characteristics of the suprathermal electron distributions produced under differing experimental conditions. Specifically, the number and total energy of suprathermal electrons as well as the suprathermal electron temperature, alpha kT/sub e/, are related to the experimental x-ray data. It is found that the suprathermal electron temperature is nearly independent of wavelength when the incident laser energy is constant.
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