skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Magnetically insulated diode for generating pulsed neutron and gamma ray emissions

Abstract

A magnetically insulated diode employs a permanent magnet to generate a magnetic insulating field between a spaced anode and cathode in a vacuum. An ion source is provided in the vicinity of the anode and used to liberate ions for acceleration toward the cathode. The ions are virtually unaffected by the magnetic field and are accelerated into a target for generating an nuclear reaction. The ions and target material may be selected to generate either neutrons or gamma ray emissions from the reaction of the accelerated ions and the target. In another aspect of the invention, a field coil is employed as part of one of the electrodes. A plasma prefill is provided between the electrodes prior to the application of a pulsating potential to one of the electrodes. The field coil multiplies the applied voltage for high diode voltage applications. The diode may be used to generate a .sup.7 Li(p,.gamma.).sup.8 Be reaction to produce 16.5 MeV gamma emission.

Inventors:
 [1];  [1]
  1. (Albuquerque, NM)
Publication Date:
Research Org.:
AT & T CORP
OSTI Identifier:
866290
Patent Number(s):
US 4675145
Assignee:
United State of America as represented by United States (Washington, DC) SNL
DOE Contract Number:
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
magnetically; insulated; diode; generating; pulsed; neutron; gamma; ray; emissions; employs; permanent; magnet; generate; magnetic; insulating; field; spaced; anode; cathode; vacuum; source; provided; vicinity; liberate; acceleration; virtually; unaffected; accelerated; target; nuclear; reaction; material; selected; neutrons; aspect; coil; employed; electrodes; plasma; prefill; prior; application; pulsating; potential; multiplies; applied; voltage; applications; produce; 16; mev; emission; gamma ray; permanent magnet; magnetic field; target material; pulsed neutron; applied voltage; magnetically insulated; field coil; nuclear reaction; ray emissions; generating pulsed; insulated diode; target mater; voltage applications; /376/250/313/315/378/

Citation Formats

Kuswa, Glenn W., and Leeper, Ramon J. Magnetically insulated diode for generating pulsed neutron and gamma ray emissions. United States: N. p., 1987. Web.
Kuswa, Glenn W., & Leeper, Ramon J. Magnetically insulated diode for generating pulsed neutron and gamma ray emissions. United States.
Kuswa, Glenn W., and Leeper, Ramon J. Thu . "Magnetically insulated diode for generating pulsed neutron and gamma ray emissions". United States. doi:. https://www.osti.gov/servlets/purl/866290.
@article{osti_866290,
title = {Magnetically insulated diode for generating pulsed neutron and gamma ray emissions},
author = {Kuswa, Glenn W. and Leeper, Ramon J.},
abstractNote = {A magnetically insulated diode employs a permanent magnet to generate a magnetic insulating field between a spaced anode and cathode in a vacuum. An ion source is provided in the vicinity of the anode and used to liberate ions for acceleration toward the cathode. The ions are virtually unaffected by the magnetic field and are accelerated into a target for generating an nuclear reaction. The ions and target material may be selected to generate either neutrons or gamma ray emissions from the reaction of the accelerated ions and the target. In another aspect of the invention, a field coil is employed as part of one of the electrodes. A plasma prefill is provided between the electrodes prior to the application of a pulsating potential to one of the electrodes. The field coil multiplies the applied voltage for high diode voltage applications. The diode may be used to generate a .sup.7 Li(p,.gamma.).sup.8 Be reaction to produce 16.5 MeV gamma emission.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1987},
month = {Thu Jan 01 00:00:00 EST 1987}
}

Patent:

Save / Share:
  • A magnetically insulated diode employs a permanent magnet to generate a magnetic insulating field between a spaced anode and cathode in a vacuum. An ion source is provided in the vicinity of the anode and used to liberate ions for acceleration toward the cathode. The ions are virtually unaffected by the magnetic field and are accelerated into a target for generating a nuclear reaction. The ions and target material may be selected to generate either neutrons or gamma ray emissions from the reaction of the accelerated ions and the target. In another aspect of the invention, a field coil ismore » employed as part of one of the electrodes. A plasma prefill is provided between the electrodes prior to the application of a pulsating potential to one of the electrodes. The field coil multiplies the applied voltage for high diode voltage applications. The diode may be used to generate a /sup 7/Li(p,..gamma..)/sup 8/Be reaction to produce 16.5 MeV gamma emission.« less
  • A magnetically insulated diode is described comprising: (a) a first cylinder defining an anode; (b) a second cylinder defining a cathode in predetermined spaced relationship to the anode. The cathode cooperates with the anode to form an acceleration gap. One of the anodes or cathodes are disposed within and axially aligned with the other of the anodes or cathodes; (c) a target material for receiving accelerated ions, the target material is disposed adjacent the cathode; (d) means for maintaining a vacuum in the space between the anode and the cathode; (e) means for applying an electrical potential between the anodemore » and the cathode; (f) magnet means, positioned only within the outermost of the cylinders, for producing a magnetic field that lies between and primarily parallel to the cylindrical surfaces of the anode and cathode for inhibiting electron flow; and (g) means for producing ions in the vicinity of the anode, the ions are accelerated across the acceleration gap and into the target material by the electrical potential.« less
  • An improved pulsed neutron porosity logging system is provided in the present invention. A logging tool provided with a 14 MeV pulsed neutron source, an epithermal neutron detector and an inelastic scattering gamma ray detector is moved through a borehole. The detection of inelastic gamma rays provides a measure of the fast neutron population in the vicinity of the detector. repetitive bursts of neutrons irradiate the earth formation and, during the busts, inelastic gamma rays representative of the fast neutron population is sampled. During the interval between bursts the epithermal neutron population is sampled along with background gamma radiation duemore » to lingering thermal neutrons. the fast and epithermal neutron population measurements are combined to provide a measurement of formation porosity.« less
  • Intense pulsed heavy ion beam is expected to be applied to materials processing including surface modification and ion implantation. For those applications, it is very important to generate high-purity ion beams with various ion species. For this purpose, we have developed a new type of a magnetically insulated ion diode with an active ion source of a gas puff plasma gun. When the ion diode was operated at a diode voltage of about 190 kV, a diode current of about 15 kA, and a pulse duration of about 100 ns, the ion beam with an ion current density of 54more » A/cm{sup 2} was obtained at 50 mm downstream from the anode. By evaluating the ion species and the energy spectrum of the ion beam via a Thomson parabola spectrometer, it was confirmed that the ion beam consists of nitrogen ions (N{sup +} and N{sup 2+}) of energy of 100-400 keV and the proton impurities of energy of 90-200 keV. The purity of the beam was evaluated to be 94%. The high-purity pulsed nitrogen ion beam was successfully obtained by the developed ion diode system.« less