Transport and focusing of an intense electron beam in a dielectric channel

Journal Article · Sun Mar 01 04:00:00 EST 1981 · Sov. J. Plasma Phys. (Engl. Transl.); (United States)

OSTI ID:5909033

Agafonov, A; Airapetov, A; Kolomenskii, A; Krastelev, E; Lebedev, A; Yablokov, B

The transport and focusing of intense electron beams with an energy of 350--800 keV and a current up to 100 kA have been studied theoretically and experimentally in vacuum channels with dielectric walls of planar, cylindrical, and conical configurations. The beam transport in these channels, which is made possible by partial neutralization of the electron space charge by ions emitted from the surface of the plasma near the wall and by the focusing of the electron beam by its own magnetic field, is of interest in connection with the use of intense electric beams for inertial-confinement fusion, microwave generation, etc. If there is no limitation on the emissivity of the plasma near the wall, there is no limitation on the beam current which can be transported, and the equilibrium beam radius increases with increasing beam current, remaining smaller than the channel radius, which is a free parameter. The efficiency of the transport and focusing of an intense electron beam has been found for the various channel configurations and for various characteristics of the injected beam. The velocity of the beam front in the channel is equal to the velocity of protons having an energy equal to that of the beam electrons. The focusing of an intense electron beam in a conical channel is limited by the emission capability of the plasma near the wall.

• Research Organization: P. N. Lebedev Physics Institute, Academy of Sciences of the USSR, Moscow
• OSTI ID: 5909033
• Journal Information: Sov. J. Plasma Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Plasma Phys. (Engl. Transl.); (United States) Vol. 7:2; ISSN SJPPD
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700104* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Experimental-- (-1987)
BEAM CURRENTS
BEAM TRANSPORT
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BEAMS
CURRENTS
ELECTRON BEAMS
ENERGY RANGE
FOCUSING
KEV RANGE
KEV RANGE 100-1000
KILO AMP BEAM CURRENTS
LEPTON BEAMS
PARTICLE BEAMS
SPACE CHARGE