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Title: Energetic electron beam generation by laser-plasma interaction and its application for neutron production

Abstract

Acceleration of electrons in the laser and magnetic field in a plasma can lead to the generation of an energetic electron beam. Both axial and azimuthal static magnetic fields play an important role to enhance the electron energy and to collimate the accelerated electrons. If the generated energetic electrons are targeted to a high-Z solid, backed with a sample of uranium-238, a significantly large number of neutrons can be produced by photonuclear reaction initiated by the Bremsstrahlung process. The efficiency of this process is found to be considerably higher than that of the spallation neutron source. The neutron source based on this process can be used as a driver for a subcritical fission reactor.

Authors:
;  [1]
  1. Center for Advanced Accelerators, Korea Electrotechnology Research Institute, Changwon 641-120 (Korea, Republic of)
Publication Date:
OSTI Identifier:
20979425
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 101; Journal Issue: 11; Other Information: DOI: 10.1063/1.2738377; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCELERATION; BREMSSTRAHLUNG; ELECTRON BEAMS; LASERS; MAGNETIC FIELDS; NEUTRON SOURCES; NEUTRONS; PHOTON-NUCLEON INTERACTIONS; PHOTONUCLEAR REACTIONS; PLASMA; PLASMA HEATING; SPALLATION; TAIL ELECTRONS; URANIUM 238

Citation Formats

Gupta, D. N., and Suk, H. Energetic electron beam generation by laser-plasma interaction and its application for neutron production. United States: N. p., 2007. Web. doi:10.1063/1.2738377.
Gupta, D. N., & Suk, H. Energetic electron beam generation by laser-plasma interaction and its application for neutron production. United States. doi:10.1063/1.2738377.
Gupta, D. N., and Suk, H. Fri . "Energetic electron beam generation by laser-plasma interaction and its application for neutron production". United States. doi:10.1063/1.2738377.
@article{osti_20979425,
title = {Energetic electron beam generation by laser-plasma interaction and its application for neutron production},
author = {Gupta, D. N. and Suk, H.},
abstractNote = {Acceleration of electrons in the laser and magnetic field in a plasma can lead to the generation of an energetic electron beam. Both axial and azimuthal static magnetic fields play an important role to enhance the electron energy and to collimate the accelerated electrons. If the generated energetic electrons are targeted to a high-Z solid, backed with a sample of uranium-238, a significantly large number of neutrons can be produced by photonuclear reaction initiated by the Bremsstrahlung process. The efficiency of this process is found to be considerably higher than that of the spallation neutron source. The neutron source based on this process can be used as a driver for a subcritical fission reactor.},
doi = {10.1063/1.2738377},
journal = {Journal of Applied Physics},
number = 11,
volume = 101,
place = {United States},
year = {Fri Jun 01 00:00:00 EDT 2007},
month = {Fri Jun 01 00:00:00 EDT 2007}
}
  • Laser wakefields driven by the ponderomotive force of a laser in a plasma accelerate charged particles. The particles are bunched during the course of acceleration. The bunch spacing is equal to the plasma wavelength, which can be less than 10 {mu}m in a plasma with density higher than 10{sup 19} cm{sup {minus}3}. The energy and phase spectra of the accelerated particles are presented. X-ray generation based on a plasma undulator is introduced as an example of applications of the laser wakefield. {copyright} {ital 1996 American Institute of Physics.}
  • Generation of anomalously energetic suprathermal electrons was observed in simulation of a high-voltage dc discharge with electron emission from the cathode. An electron beam produced by the emission interacts with the nonuniform plasma in the discharge via a two-stream instability. The energy transfer from the beam to the plasma electrons is ensured by the plasma nonuniformity. The electron beam excites plasma waves whose wavelength and phase speed gradually decrease towards anode. The waves with short wavelength near the anode accelerate plasma bulk electrons to suprathermal energies. The sheath near the anode reflects some of the accelerated electrons back into themore » plasma. These electrons travel through the plasma, reflect near the cathode, and enter the accelerating area again but with a higher energy than before. Such particles are accelerated to energies much higher than after the first acceleration. This mechanism plays a role in explaining earlier experimental observations of energetic suprathermal electrons in similar discharges.« less
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  • Propagation of an ionization front in the beam channel was observed after plasma was generated using a 170 GHz millimeter-wave beam in the atmosphere. The propagation velocity of the ionization front was found to be supersonic when the millimeter-wave power density was greater than 75 kW cm{sup -2}. The momentum coupling coefficient C{sub m}, a ratio of the propulsive impulse to the input energy, was measured using conical and cylindrical thruster models. A C{sub m} value greater than 350 N MW{sup -1} was recorded when the ionization front propagated with supersonic velocity.