Relativistic Electron Beam Interaction And Ka Generation In Solid Targets PDF Download
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Release | : 1999 |
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Download Relativistic Electron Beam Interaction and Ka - Generation in Solid Targets Book in PDF, ePub and Kindle
When fs laser pulses interact with solid surfaces at intensities I?2> 1018 W/cm2?m2, collimated relativistic electron beams are generated. These electrons can be used for producing intense X-radiation (bremsstrahlung or K{sub {alpha}}) for pumping an innershell X-ray laser. The basic concept of such a laser involves the propagation of the electron beam in a material which converts electron energy into appropriate pump photons. Using the ATLAS titanium-sapphire laser at Max-Planck-Institut fuer Quantenoptik, the authors investigate the generation of hot electrons and of characteristic radiation in copper. The laser (200 mJ/130 fs) is focused by means of an off-axis parabola to a diameter of about 10?m. By varying the position of the focus, they measure the copper K{sub {alpha}} - yield as a function of intensity in a range of 1015 to 2 x 1018 W/cm2 while keeping the laser pulse energy constant. Surprisingly, the highest emission is obtained at an intensity of about 1017 W/cm2. However, this result is readily explained by the weak scaling of the hot-electron temperature with intensity. An efficiency of 2 x 10−4 for the conversion of laser energy into copper K{sub {alpha}} is measured. Simulations of the interaction of the hot electrons with the cold target material and the conversion into X-rays are carried out by means of the TIGER/ITS code, a time-independent, coupled electron/photon Monte Carlo transport code. The code calculates the propagation of individual electrons and the generation of photons in cold material. Comparison of the code predictions with the data shows an efficiency of 15% for the generation of electrons with energies in the 100 keV range. A second experiment involves the demonstration of photopumping of an innershell transition in cobalt by the copper radiation. Comparing the emission with the one of nickel, which is not photopumped by copper K{sub {alpha}} photons, an enhancement of more than a factor of two was obtained. An essential part of this experiment is the use of a 1 mm carbon sheet to block the electrons from the material to be photopumped.
Author | : Mireille Coury |
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Total Pages | : 0 |
Release | : 2013 |
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Download Generation and Transport of High-current Relativistic Electron Beams in High Intensity Laser-solid Interactions Book in PDF, ePub and Kindle
Author | : Philippe Leblanc |
Publisher | : |
Total Pages | : 222 |
Release | : 2013 |
Genre | : Electronic books |
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Download Study of Transport of Laser-driven Relativistic Electrons in Solid Materials Book in PDF, ePub and Kindle
With the ultra intense lasers available today, it is possible to generate very hot electron beams in solid density materials. These intense laser-matter interactions result in many applications which include the generation of ultrashort secondary sources of particles and radiation such as ions, neutrons, positrons, x-rays, or even laser-driven hadron therapy. For these applications to become reality, a comprehensive understanding of laser-driven energy transport including hot electron generation through the various mechanisms of ionization, and their subsequent transport in solid density media is required. This study will focus on the characterization of electron transport effects in solid density targets using the state-of- the-art particle-in-cell code PICLS. A number of simulation results will be presented on the topics of ionization propagation in insulator glass targets, non-equilibrium ionization modeling featuring electron impact ionization, and electron beam guiding by the self-generated resistive magnetic field. An empirically derived scaling relation for the resistive magnetic in terms of the laser parameters and material properties is presented and used to derive a guiding condition. This condition may prove useful for the design of future laser-matter interaction experiments.
Author | : David Mosher |
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Total Pages | : 49 |
Release | : 1974 |
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Download Interactions of Relativistic Electron Beams with High-Atomic-Number Plasmas Book in PDF, ePub and Kindle
A relativistically-correct Fokker-Planck analysis is used to develop fluid equations which model the interaction of relativistic electron beams with high atomic-number plasmas. The derived collision terms can be used to describe scattering and energy in materials ranging from the solid to high-temperature plasma forms. The full set of equations discussed can be used to study electron-beam-initiated pellet-fusion in a completely self-consistent fashion. Specifically, the model is applicable to study of beam pinching in plasma-filled diodes, the interaction of focussed beams with target plasmas, and the transport of high nu/gamma beams in high atomic-number plasmas. Although the general equations are amenable to solution only by computational techniques, analytic solutions describing the time-dependent, collisional interaction of a beam in an infinite plasma, and the one-dimensional equilibrium of a beam in a plasma with applied electric field have been obtained.
Author | : Linda Habash Krause |
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Total Pages | : 532 |
Release | : 1998 |
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Download The Interaction of Relativistic Electron Beams with the Near-earth Space Environment Book in PDF, ePub and Kindle
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Total Pages | : 20 |
Release | : 1975 |
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Download Interaction of Relativistic Electron Beams with Fusion Target Blow-off Plasmas Book in PDF, ePub and Kindle
The relativistic Boltzmann equation with a Fokker Planck collision term is solved with the assumption that elastic scattering characterizes the shortest time and length scales of the beam plasma system. Explicit one dimensional solutions containing the self consistent return current electric field show that although range shortening occurs, the primary effect of the electric field is to prevent high current density beams from penetrating into the dense plasma region.
Author | : D. Mosher |
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Total Pages | : 35 |
Release | : 1976 |
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Download Interaction of Cylindrically-Symmetric Relativistic Electron Beams with Planar Targets and Plasmas: Theory and Applications Book in PDF, ePub and Kindle
A diffusion theory for the collisional interaction of relativistic electron beams with high-atomic-number plasmas is used to develop analytical expressions for the beam-momentum distribution function in a slab target or plasma for the case of a normally incident, well-collimated, monoenergetic beam with any radial profile. Moments of the distribution function are calculated for a Gaussian incident profile of arbitrary width. Using these, contour plots of energy deposition and current flow are determined. Bremsstrahlung intensity profiles corresponding to pinhole photographs of tightly pinched beams are presented for various ratios of incident beam width to electron range. Theoretical deposition profiles, current transmission, and energy coupling of beam to target are compared with the results of Monte Carlo calculations.
Author | : National Research Council |
Publisher | : National Academies Press |
Total Pages | : 177 |
Release | : 2003-05-11 |
Genre | : Science |
ISBN | : 030908637X |
Download Frontiers in High Energy Density Physics Book in PDF, ePub and Kindle
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.
Author | : Nikita Wells |
Publisher | : |
Total Pages | : 100 |
Release | : 1987 |
Genre | : Electron beams |
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Download Soviet Research on the Transport of Intense Relativistic Electron Beams Through High-pressure Air Book in PDF, ePub and Kindle
Soviet research on the propagation of intense relativistic electron beams (IREB) through fairly high-pressure air (pressure range 0.1 to 760 Torr) since the early 1970s has included the study of the plasma channel created by the passage of the electron beam through air, the resistive hose instability and its effect on beam propagation, the effect of self-fields, current enhancement, gas expansion, return currents, inherent beam energy spread, and other factors. This report covers Soviet developments in IREB propagation through air where the beam is not focused by external magnetic fields. The information was obtained from Soviet open-source publications with emphasis given to the last ten years of beam propagation in the Soviet Union. The volume of papers published on this subject in recent years indicates a significant increase in Soviet research in this area.
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Total Pages | : 586 |
Release | : 1994 |
Genre | : Power resources |
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Download Energy Research Abstracts Book in PDF, ePub and Kindle
Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.