Accession Number:

ADA256974

Title:

High Power Switching and Other High Power Devices

Descriptive Note:

Final technical rept. 1 May 1989-31 Jul 1992

Corporate Author:

UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING AND ELECTROPHYSICS

Personal Author(s):

Report Date:

1992-09-30

Pagination or Media Count:

21.0

Abstract:

High power thyratrons and devices such as high power microwave sources have cathode-related performance limits. The report describes research of a simple, robust super-emissive cathode that produces 1 0,000 Acm2 from a macroscopic area approx. 1 cm2, and operates with a low pressure approx. 0. 1 torr, spatially-uniform glow plasma density 1015 cm-3. The cathode also can operate as a hollow cathode, and is at the heart of the operation of the pseudospark and back-lighted thyratron. The physics of this hollow and super- emissive cathode is very rich. The hollow cathode geometry traps electrons in the hollow cathode backspace. The lifetime of these electrons enables them to ionize a spatially homogeneous high density glow, and this hollow cathode mode of operation is responsible for certain types of electron and ion beam behavior. A plasma cathode sheath that is formed during this phase leads to super-emissive behavior, which is responsible for high current emission. Super- emissive cathode thyratron-type switches with higher peak current, voltage, didt being developed for pulsed power switching of lasers, accelerators, high current and high coulomb transfer, Marx bank operation, transfer of technology to commercial applications, high current electron beams, and millimeter wave generation 1-100 GHz are described.

Subject Categories:

  • Electrical and Electronic Equipment
  • Electric Power Production and Distribution
  • Particle Accelerators
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE