Accession Number : ADD014435

Title :   Laser Controlled Semiconductor Armature for Electromagnetic Launchers.

Descriptive Note : Patent Application, Filed 16 Jan 90,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Jasper, Louis J , Jr ; Weiner, Maurice ; Bovino, Lawrence J

Report Date : 16 Jan 1990

Pagination or Media Count : 13

Abstract : An electromagnetic launcher or railgun includes a projectile or armature which is comprised of an optically activated semiconductor switch device including a body of bulk semiconductor material, such as gallium arsenide (GaAs) or gallium arsenide doped with chromium (Cr: GaAs), located between a pair of rails across which is connected a relatively high current source. A source of optical energy, such as a pulsed laser, directs optical energy to at least one surface of the semiconductor switch device where the conductivity of the semiconductor body, is thereby increased and current from the source is transformed between the rails through the semiconductor body, causing an electromagnetic Lorentz type drive force to be built up behind the armature, which is set into motion and rapidly accelerated along the rails. (emk)

Descriptors :   *BULK SEMICONDUCTORS, ARMATURES, BULK MATERIALS, CHROMIUM, CONTROL, ELECTROMAGNETISM, ELECTRONIC SWITCHES, ENERGY, GALLIUM ARSENIDES, HIGH POWER, HYPERVELOCITY GUNS, LASERS, LAUNCHERS, OPTICAL PROPERTIES, PULSED LASERS, RAILS, SEMICONDUCTOR DEVICES, SEMICONDUCTORS, SOURCES, SURFACES

Subject Categories : Electromagnetic Shielding

Distribution Statement : APPROVED FOR PUBLIC RELEASE