Long life electrodes for large-area x-ray generators

Details Long life electrodes for large-area x-ray generators Long life electrodes for large-area x-ray generators

1989-02-27

1991-05-07

Fields, Carolyn E.

X-ray or gamma ray systems or devices

Source

Electron tube

378119, 378136, 378143, H01J 3504

Patent

active

050142895

ABSTRACT:
This invention is directed to rugged, reliable, and long-life electrodes for use in large-area, high-current-density electron gun and x-ray generators which are employed as contamination-free preionizers for high-energy pulsed gas lasers. The electron source at the cathode is a corona plasma formed at the interface between a conductor, or semiconductor, and a high-permittivity dielectric. Detailed descriptions are provided of a reliable cold plasma cathode, as well as an efficient liquid-cooled electron beam target (anode) and x-ray generator which concentrates the x-ray flux in the direction of an x-ray window.

REFERENCES:
patent: 4012656 (1977-03-01), Norman et al.
patent: 4670894 (1987-06-01), Birnbach et al.
patent: 4757524 (1988-07-01), Laul
J. I. Levatter and S. C. Lin, "Necessary Conditions for the Homogeneous Formation of Pulsed Avalanche Discharges at High Gas Pressures," J. Appl. Phys. 51 (1980), 210.
S. J. Scott, "Experimental Investigations on an X-ray Preionizer Test Bed," J. Appl. Phys. 64 (1988), 537.
G. Wakaloupulos, "High Peak Power Pulsed WIP Electron Gun," Final Report, Contract No. 78-73-09176/E1377-002, Lawrence Livermore Radiation Lab., Livermore, Calif. (Oct. 1978).
J. I. Levatter, R. L. Sandstrom, and J. H. Morris, "The Corona Plasma Cathode: A New Long-Life E-Beam Cathode for X-ray Preionization," Proc. IEEE, 4th Pulsed Power Conf., 1983, ed. T. K. Martin, M. F. Rose (N.Y. 1983).

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