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Application of the Relativistic Electron Beams Originating in the Discharges of Plasma Focus Type for the Combined Laser-Reb Plasma Heating

  • V. A. Gribkov

Abstract

Experimental investigations of the recent years allow to treat the discharge of plasma-focus-type (DPF) as an inductive storage with the switching time of the order of tens nsec. It results from the interferometry and X-ray measurements. The moment of the current sheath rupture coincides with the beginning of hard X-ray pulse. A considerableart of the bank energy (concentrated in the magnetic field near focus) converts into the electron beam energy with the mean energy of electrons of the order of I00 KeV after the disruption of the current. The interferometry allowed to investigate the dynamics of REB in DPF. The beam appeared to be divided into several filaments, and disturbed by “hose” instability and self-focusing inside the residual plasma. The X-ray pinhole pictures showed high plasma luminosity in the regions of beam focus, a neutron yield of the set-up had its maximum at this moment. All these data with anomalous scattering of diagnostic laser light in this region, high level of plasma noise with the frequency of the order of Langnuir frequency (by the factor of I06) and broad neutron spectra show us that an effective turbulent interaction of REB with plasma takes place in DPF. An experiment of particular interest for us involves the realization of laser initiated breakdown in the insulator and a combined laser-REB plasma heating. Analytical calculations indicate that when the REB energy is of the order of I04–I06J and the laser pulse duration of I0−9–I0−10 sec, the laser energy of the order of IO3J is required for the experiment.

Keywords

Neutron Yield Laser Pulse Duration Relativistic Electron Beam Current Sheath Anomalous Scattering 
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Copyright information

© Plenum Press, New York 1976

Authors and Affiliations

  • V. A. Gribkov
    • 1
  1. 1.Lebedev Physical InstituteAc.Sci.MoscowUSSR

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