Hot Electron Measurement And Modeling For Short Pulse Laser Plasma Interactions
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Hot Electron Measurement And Modeling For Short Pulse Laser Plasma Interactions
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Author : H. Chen
language : en
Publisher:
Release Date : 2003
Hot Electron Measurement And Modeling For Short Pulse Laser Plasma Interactions written by H. Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
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.
Short Pulse Laser Interactions With Matter An Introduction
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Author : Paul Gibbon
language : en
Publisher: World Scientific
Release Date : 2005-09-05
Short Pulse Laser Interactions With Matter An Introduction written by Paul Gibbon and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-09-05 with Science categories.
This book represents the first comprehensive treatment of the subject, covering the theoretical principles, present experimental status and important applications of short-pulse laser-matter interactions.Femtosecond lasers have undergone dramatic technological advances over the last fifteen years, generating a whole host of new research activities under the theme of “ultrafast science”. The focused light from these devices is so intense that ordinary matter is torn apart within a few laser cycles. This book takes a close-up look at the exotic physical phenomena which arise as a result of this new form of “light-matter” interaction, covering a diverse set of topics including multiphoton ionization, rapid heatwaves, fast particle generation and relativistic self-channeling. These processes are central to a number of exciting new applications in other fields, such as microholography, optical particle accelerators and photonuclear physics.Repository for numerical models described in Chapter 6 can be found at www.fz-juelich.de/zam/cams/plasma/SPLIM/./a
Measurement Of The Relaxation Time Of Hot Electrons In Laser Solid Interaction At Relativistic Laser Intensities
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Author :
language : en
Publisher:
Release Date : 2006
Measurement Of The Relaxation Time Of Hot Electrons In Laser Solid Interaction At Relativistic Laser Intensities written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
The authors have measured the relaxation time of hot electrons in short pulse laser-solid interactions using a picosecond time-resolved x-ray spectrometer and a time-integrated electron spectrometer. Employing laser intensities of 1017, 1018, and 1019 W/cm2, they find increased laser coupling to hot electrons as the laser intensity becomes relativistic and thermalization of hot electrons at timescales on the order of 10 ps at all laser intensities. They propose a simple model based on collisional coupling and plasma expansion to describe the rapid relaxation of hot electrons. The agreement between the resulting K{sub {alpha}} time-history from this model with the experiments is best at highest laser intensity and less satisfactory at the two lower laser intensities.
Laser To Hot Electron Conversion Limitations In Relativistic Laser Matter Interactions Due To Multi Picosecond Dynamics
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Author :
language : en
Publisher:
Release Date : 2015
Laser To Hot Electron Conversion Limitations In Relativistic Laser Matter Interactions Due To Multi Picosecond Dynamics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
High-energy short-pulse lasers are pushing the limits of plasma-based particle acceleration, x-ray generation, and high-harmonic generation by creating strong electromagnetic fields at the laser focus where electrons are being accelerated to relativistic velocities. Understanding the relativistic electron dynamics is key for an accurate interpretation of measurements. We present a unified and self-consistent modeling approach in quantitative agreement with measurements and differing trends across multiple target types acquired from two separate laser systems, which differ only in their nanosecond to picosecond-scale rising edge. Insights from high-fidelity modeling of laser-plasma interaction demonstrate that the ps-scale, orders of magnitude weaker rising edge of the main pulse measurably alters target evolution and relativistic electron generation compared to idealized pulse shapes. This can lead for instance to the experimentally observed difference between 45 MeV and 75 MeV maximum energy protons for two nominally identical laser shots, due to ps-scale prepulse variations. Our results indicate that the realistic inclusion of temporal laser pulse profiles in modeling efforts is required if predictive capability and extrapolation are sought for future target and laser designs or for other relativistic laser ion acceleration schemes.
Frontiers In High Energy Density Physics
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Author : National Research Council
language : en
Publisher: National Academies Press
Release Date : 2003-05-11
Frontiers In High Energy Density Physics written by National Research Council and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-05-11 with Science categories.
Recent scientific and technical advances have made it possible to create matter in the laboratory under conditions relevant to astrophysical systems such as supernovae and black holes. These advances will also benefit inertial confinement fusion research and the nation's nuclear weapon's program. The report describes the major research facilities on which such high energy density conditions can be achieved and lists a number of key scientific questions about high energy density physics that can be addressed by this research. Several recommendations are presented that would facilitate the development of a comprehensive strategy for realizing these research opportunities.
Laser Plasma Interactions
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Author : Dino A. Jaroszynski
language : en
Publisher: CRC Press
Release Date : 2009-03-27
Laser Plasma Interactions written by Dino A. Jaroszynski and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-03-27 with Science categories.
A Solid Compendium of Advanced Diagnostic and Simulation ToolsExploring the most exciting and topical areas in this field, Laser-Plasma Interactions focuses on the interaction of intense laser radiation with plasma. After discussing the basic theory of the interaction of intense electromagnetic radiation fields with matter, the book covers three ap
Integrated Kinetic Simulation Of Laser Plasma Interactions Fast Electron Generation And Transport In Fast Ignition
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Author :
language : en
Publisher:
Release Date : 2009
Integrated Kinetic Simulation Of Laser Plasma Interactions Fast Electron Generation And Transport In Fast Ignition written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
We present new results on the physics of short-pulse laser-matter interaction of kilojoule-picosecond pulses at full spatial and temporal scale, using a new approach that combines a 3D collisional electromagnetic Particle-in-Cell code with an MHD-hybrid model of high-density plasma. In the latter, collisions damp out plasma waves, and an Ohm's law with electron inertia effects neglected determines the electric field. In addition to yielding orders of magnitude in speed-up while avoiding numerical instabilities, this allows us to model the whole problem in a single unified framework: the laser-plasma interaction at sub-critical densities, energy deposition at relativistic critical densities, and fast-electron transport in solid densities. Key questions such as the multi-picosecond temporal evolution of the laser energy conversion into hot electrons, the impact of return currents on the laser-plasma interaction, and the effect of self-generated electric and magnetic fields on electron transport will be addressed. We will report applications to current experiments.
Inertial Fusion Sciences And Applications 2003
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Author : B. A. Hammel
language : en
Publisher:
Release Date : 2004
Inertial Fusion Sciences And Applications 2003 written by B. A. Hammel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Controlled fusion categories.
A Novel Compact Electron Spectrometer For Hot Electron Measurement In Pulsed Laser Solid Interaction
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Author :
language : en
Publisher:
Release Date : 2002
A Novel Compact Electron Spectrometer For Hot Electron Measurement In Pulsed Laser Solid Interaction written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Ultra-intense laser-matter interactions provide a unique source of temporally short, broad spectrum electrons, which may be utilized in many varied applications. One such, which we are pursuing, is as part of a novel diagnostic to trace magnetic field lines in a magnetically-confined fusion device. An essential aspect of this scheme is to have a detailed characterization of the electron angular and energy distribution. To this effect we designed and constructed a 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 2 MeV. We tested the spectrometer on a high intensity (1017 to 1021 W/cm2) short pulse (
Modeling Shortpulse Single Hot Spot Laser Plasma Interaction Experiments Using The Vpic Particle In Cell Code
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Author :
language : en
Publisher:
Release Date : 2010
Modeling Shortpulse Single Hot Spot Laser Plasma Interaction Experiments Using The Vpic Particle In Cell Code written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.