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This Defense Intelligence Reference Document from the Defense Intelligence Agency, dated 28 January 2010, surveys pulsed high-power microwave (HPM) source technology. It was produced under the Advanced Aerospace Weapon System Applications (AAWSA) program. It covers insulation, cathode materials, high-voltage switching, pulse generators, microwave sources such as magnetrons, gyrotrons and the Phoenix and Jolt sources, and antennas. The document concludes that progress depends on advances in cathodes, switching and insulation. It says compact ultrawideband antennas will remain difficult to build.
“The Times”17 pages
UNCLASSIFIED/ }FQA 8FFIIItllL t!l91!! erct I Gyrotrons are important in narrowband HPM production because the only directed-energy weapon system known to be fielded today is based on them. The Active Denial System (ADS) uses a gyrotron operating at 95 GHz that is capable of continuous operation. Power output is 100 kW, and the range is more than 750 meters. The system uses an innovative flat parabolic surface (FLAPS) antenna to radiate a focused beam in a manner similar to a parabolic dish. The ADS is effective as a less-than-lethal weapon for crowd dispersal. The radiation passes through the atmosphere with very low loss and is absorbed in the outer layer of skin, causing a burning sensation sufficiently intense to trigger an involuntary reflex ' Figure 4. Active Denial System With FLAPS Antenna response in the target. Energy is deposited to a depth of about 0.4 mm. Figure 4 shows a deployment of the ADS with the FLAPS antenna. IMPULSE HPM SOURCES Impulse HPM sources are typically ultrawideband. Microwave generation is accomplished by charging the antenna, a transmission line, or a tuned circuit directly with an extremely fast rise-time electrical pulse. This is usually done using a well- designed switch operating in an extremely overvolted condition. SNIPER SNIPER (Sub-Nanosecond ImPulsE Radiator) is an SNL HPM source operating at 290 kV that is capable of greater-than-1-kHz PRR. The peak power in the 3.5-ns-wide pulse is 1.25 GW, and the rise time is approximately 150 ps, resulting in spectral content from 100 MHz to 1.5 GHz. The radiated field strength, normalized to a distance of 1 meter, is 120 kV/musing a transverse electromagnetic (TEM) horn. EMBL EMBL (EnantioMorphic BLumlein) is an SNL HPM source operating at 750 kV that is capable of 700-Hz PRR. The peak power in the 3.5-ns-wide pulse is 11 GW, and the rise time is about 200 ps. EMBL radiates a 285-ps impulse with a TEM horn antenna. Its spectral content extends from 0.2 to 1.2 GHz, with the peak at 800 MHz. The radiated field strength normalized to a distance of 1 meter is 350 kV/m. H-SERIES HPM SOURCES The H-series HPM sources-H2, H3, and HS-were built at the AFRL and used for various tests of assets. They are all currently inactive, except for a modified version of H3, which is being used for research at the University of New Mexico. The H-series HPM sources are all coaxial line pulsers, meaning they contain a pulsed power section that 20 UNCLASSIFIED//r;Oll oi;i;1,;;1•k llili O•lk¥
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Report, from the dia collection. The PDF is mirrored here; the original link is under it. 37 pages are in the text index: search them above, or from the library's search.