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Hot Electron Diagnostic In A Solid Laser Target By K Shell Lines Measurement From Ultra Intense Laser Plasma Interactions R
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Book Synopsis Hot Electron Diagnostic in a Solid Laser Target by K-Shell Lines Measurement from Ultra-Intense Laser-Plasma Interactions R by :
Download or read book Hot Electron Diagnostic in a Solid Laser Target by K-Shell Lines Measurement from Ultra-Intense Laser-Plasma Interactions R written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Characterization of hot electron production (a conversion efficiency from laser energy into electrons) from ultra intense laser-solid target interaction by observing molybdenum (Mo) K[beta] as well as K[alpha] emissions from a buried fluorescence tracer layer in the targets has been done. The experiments used 1.06 [mu]m laser light with an intensity of from 2 x 1018 up to 3 x 102° W cm−2 (20-0.5 ps pulse width) and an on target laser energy of 280-500 J. The conversion efficiency from the laser energy into the energy, carried by hot electrons, has been estimated to be ≈50% for the 0.5 ps shots at an on-target laser intensity of 3 x 102° W cm−2, which increased from ≈30% at 1 x 1019 W cm−2 5 ps shots and ≈ 12% at 2 x 1018 W cm−2 20 ps shots.
Book Synopsis Hot Electron Diagnostic in a Solid Laser Target by Buried K-Shell Fluorer Technique from Ultra-Intense (3x1020W/cm2, [500 J) Laser-Plasma Interactions on the Petawatt Laser at LLNL. by :
Download or read book Hot Electron Diagnostic in a Solid Laser Target by Buried K-Shell Fluorer Technique from Ultra-Intense (3x1020W/cm2, [500 J) Laser-Plasma Interactions on the Petawatt Laser at LLNL. written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Characterization of hot electron production (a conversion efficiency from laser energy into electrons) in ultra intense laser-solid target interaction, using 1.06 [mu]m laser light with an intensity of up to 3 x 102°W cm−2 and an on target laser energy of ≤500 J, has been done by observing K{sub {beta}} as well as K{sub {alpha}} emissions from a buried Mo layer in the targets, which are same structure as in the previous 100 TW experiments but done under less laser intensity and energy conditions (≤ 4 x 1019 Wcm−2 and ≤ 30 J). The conversion efficiency from the laser energy into the energy, carried by hot electrons, has been estimated to be ≈50%, which are little bit higher than the previous less laser energy (≈ 20 J) experiments, yet the x-ray emission spectra from the target has change drastically, i.e., gamma flash.
Book Synopsis Laser-Plasma Acceleration by : Società italiana di fisica
Download or read book Laser-Plasma Acceleration written by Società italiana di fisica and published by IOS Press. This book was released on 2012-09-18 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Impressive progress has been made in the field of laser-plasma acceleration in the last decade, with outstanding achievements from both experimental and theoretical viewpoints. Closely exploiting the development of ultra-intense, ultrashort pulse lasers, laser-plasma acceleration has developed rapidly, achieving accelerating gradients of the order of tens of GeV/m, and making the prospect of miniature accelerators a more realistic possibility. This book presents the lectures delivered at the Enrico Fermi International School of Physics and summer school: "Laser-Plasma Acceleration" , held in Varenna, Italy, in June 2011. The school provided an opportunity for young scientists to experience the best from the worlds of laser-plasma and accelerator physics, with intensive training and hands-on opportunities related to key aspects of laser-plasma acceleration. Subjects covered include: the secrets of lasers; the power of numerical simulations; beam dynamics; and the elusive world of laboratory plasmas. The objective of the school was to establish a common knowledge base for the future laser-plasma accelerator community. These published proceedings aim to provide a wider community with a reference covering a wide range of topics, knowledge of which will be necessary to future research on laser-plasma acceleration. The book also provides references to selected existing literature for further reading.
Book Synopsis Inertial Fusion Sciences and Applications 2005 by : Jean-Claude Gauthier
Download or read book Inertial Fusion Sciences and Applications 2005 written by Jean-Claude Gauthier and published by . This book was released on 2006 with total page 1288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal de physique written by and published by . This book was released on 2006 with total page 1310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Titanium K-alpha X-ray Imaging Radiography of Imploding Microshells Using a Spherically Bent Crystal by : James Anthony King
Download or read book Titanium K-alpha X-ray Imaging Radiography of Imploding Microshells Using a Spherically Bent Crystal written by James Anthony King and published by . This book was released on 2006 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atoms and Plasmas in Super-intense Laser Fields by : Dimitri Batani
Download or read book Atoms and Plasmas in Super-intense Laser Fields written by Dimitri Batani and published by SIF Edizioni Scientifiche. This book was released on 2004 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantitative Kα Line Spectroscopy for Energy Transport in Ultra-intense Laser Plasma Interaction by :
Download or read book Quantitative Kα Line Spectroscopy for Energy Transport in Ultra-intense Laser Plasma Interaction written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Absolute Ka line spectroscopy is proposed for studying laser-plasma interactions taking place in the cone-guided fast ignition targets. X-ray spectra ranging from 20 to 100 keV were quantitatively measured with a Laue spectrometer. The absolute sensitivities of the Laue spectrometer system were calibrated using pre-characterized laser-produced x-ray sources and radioisotopes. The integrated reflectivity for the crystal is in good agreement with predictions by an open code for x-ray diffraction. The energy transfer efficiency from incident laser beams to hot electrons, as the energy transfer agency, is derived as a consequence of this work. The absolute yield of Au and Ta Ka lines were measured in the fast ignition experimental campaign performed at Institute of Laser Engineering, Osaka University. Applying the hot electron spectrum information from the electron spectrometer, an energy transfer efficiency of the incident LFEX [1], a kJ-class PW laser, to hot electrons was derived for a planar and cone-guided geometry.
Book Synopsis Hot Electron Measurement and Modeling for Short-Pulse Laser Plasma Interactions by : H. Chen
Download or read book Hot Electron Measurement and Modeling for Short-Pulse Laser Plasma Interactions written by H. Chen and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We measured the hot electron production from short pulse laser plasma interactions using a fiber-array-based compact electron spectrometer that uses permanent magnets for electron energy dispersion and over 100 scintillating fibers coupled to a 1024 x 1024 pixel CCD as the detection system. This spectrometer has electron energy coverage from 10 keV to 60 MeV. The whole spectrometer is compact with dimensions of 8 inch x 7 inch x 4 inch. We performed systematic measurements of electron production on the ultra short pulse laser JanUSP (with pulse width less than 100 fs) at intensity range interest to Fast Ignition scheme from 10{sup 17} Wcm{sup -2} up to 10{sup 19} Wcm{sup -2} at Lawrence Livermore National laboratory. The electron distributions were obtained at various laser energies for different solid target materials and observation angles. We determined characteristic temperature of the escaped hot electrons at various incident laser intensity which is confirmed by theoretical simulations using the ZOHAL Particle-in-cell (PIC) code.
Download or read book Superstrong Fields in Plasmas written by and published by . This book was released on 2002 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Superstrong Fields in Plasmas by : Istituto di fisica del plasma (Italy)
Download or read book Superstrong Fields in Plasmas written by Istituto di fisica del plasma (Italy) and published by American Institute of Physics. This book was released on 2002-04-12 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past few years, laser intensities have dramatically increased. Today, relatively compact laser systems can produce on target intensities four to five orders of magnitude greater than was previously possible. During this conference, the most recent theoretical and experimental advances in several fields of basic physics and of the relevant technological applications, made possible by the rapid development of such superstrong lasers, were presented and discussed. In the present volume the reader will find general and technical contributions on topics such as atomic and molecular dynamics in strong fields, high harmonic generation, coherent X-ray radiation, nonlinear plasma dynamics and relativistic optics, ultrarelativistic particle production and acceleration, inertial confinement fusion and fast ignition, laboratory astrophysics, high energy astrophysics and cosmology, applications of superstrong pulses to high energy physics.
Book Synopsis HOT ELECTRON ENERGY DISTRIBUTIONS FROM ULTRA-INTENSE LASER SOLID INTERACTIONS. by : R. Snavely
Download or read book HOT ELECTRON ENERGY DISTRIBUTIONS FROM ULTRA-INTENSE LASER SOLID INTERACTIONS. written by R. Snavely and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present experimental data of electron energy distributions from ultra-intense (>10{sup 19} W/cm{sup 2}) laser-solid interactions using the Rutherford Appleton Laboratory Vulcan petawatt laser. These measurements were made using a CCD-based magnetic spectrometer. We present details on the distinct effective temperatures that were obtained for a wide variety of targets as a function of laser intensity. It is found that as the intensity increases from 10{sup 17} W/cm{sup 2} to 10{sup 19} W/cm{sup 2}, a 0.4 dependence on the laser intensity is found. Between 10{sup 19} W/cm{sup 2} and 10{sup 20} W/cm{sup 2}, a gradual rolling off of temperature with intensity is observed.
Book Synopsis Electron-Heated Target Temperature Measurements in Petawatt Laser Experiments Based on Extreme Ultraviolet Imaging and Spectroscopy by :
Download or read book Electron-Heated Target Temperature Measurements in Petawatt Laser Experiments Based on Extreme Ultraviolet Imaging and Spectroscopy written by and published by . This book was released on 2008 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three independent methods (XUV spectroscopy, imaging at 68 eV and 256 eV) have been used to measure planar target rear surface plasma temperature due to heating by hot electrons. The hot electrons are produced by ultra-intense laser plasma interactions using the 150 J, 0.5 ps Titan laser. Soft x-ray spectroscopy in the 50-400 eV region and imaging at the 68 eV and 256 eV photon energies were used to determine the rear surface temperature of planar CD targets. Temperatures were found to be in the 60-150 eV range, with good agreement between the three diagnostics.
Book Synopsis Study of Relativistic Electrons Generated from Ultra-intense Laser-plasma Interaction Relevant to Laser Wakefield Acceleration and Fast Ignition Laser Fusion by : Mianzhen Mo
Download or read book Study of Relativistic Electrons Generated from Ultra-intense Laser-plasma Interaction Relevant to Laser Wakefield Acceleration and Fast Ignition Laser Fusion written by Mianzhen Mo and published by . This book was released on 2015 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra-intense (> 10^18 W/cm^2) laser interaction with matter is capable of producing relativistic electrons which have a variety of applications in scientific and medical research. Knowledge of various aspects of these hot electrons is important in harnessing them for various applications. Of particular interest for this thesis is the investigation of hot electrons generated in the areas of Laser Wakefield Acceleration (LWFA) and Fast Ignition (FI). LWFA is a physical process in which electrons are accelerated by the strong longitudinal electrostatic fields that are formed inside the plasma cavities or wakes produced by the propagation of an ultra-intense laser pulse through an under-dense plasma. The accelerating E-fields inside the cavities are 1000 times higher than those of conventional particle accelerators and can accelerate electrons to the relativistic regime in a very short distance, on the order of a few millimeters. In addition, Betatron X-ray radiation can be produced from LWFA as a result of the transverse oscillations of the relativistic electrons inside the laser wakefield driven cavity. The pulse duration of Betatron radiation can be as short as a few femtoseconds, making it an ideal probe for measuring physical phenomena taking place on the time scale of femtoseconds. Experimental research on the electron acceleration of the LWFA has been conducted in this thesis and has led to the generation of mono-energetic electron bunches with peak energies ranging from a few hundreds of MeV to 1 GeV. In addition, the Betatron radiation emitted from LWFA was successfully characterized based on a technique of reflection off a grazing incidence mirror. Furthermore, we have developed a Betatron X-ray probe beamline based on the technique of K-shell absorption spectroscopy to directly measure the temporal evolution of the ionization states of warm dense aluminum. With this, we have achieved for the first time direct measurements of the ionization states of warm dense aluminum using Betatron X-ray radiation probing. Fast Ignition (FI) is an advanced scheme for inertial confinement fusion (ICF), in which the fuel ignition process is decoupled from its compression. Comparing with the conventional central hot-spot scheme for ICF, FI has the advantages of lower ignition threshold and higher gain. The success of FI relies on efficient energy coupling from the heating laser pulse to the hot electrons and subsequent transport of their energy to the compressed fuel. As a secondary part of this thesis, the transport of hot electrons in overdense plasma relevant to FI was studied. In particular, the effect of resistive layers within the target on the hot electron divergence and absorption was investigated. Experimental measurements were carried out and compared to simulations indicating minimal effect on the beam divergence but some attenuation through higher atomic number intermediate layers was observed.
Book Synopsis High-power Lasers in Energy Engineering by : Kunioki Mima
Download or read book High-power Lasers in Energy Engineering written by Kunioki Mima and published by SPIE-International Society for Optical Engineering. This book was released on 2000 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 922 pages. Available in PDF, EPUB and Kindle. Book excerpt:
