AAWSAP DIRD, Advanced Nuclear Propulsion for Manned Deep Space Missions, March 2010

This Defense Intelligence Reference Document is dated 11 March 2010. It was prepared by the Defense Intelligence Agency's Defense Warning Office as part of the Advanced Aerospace Weapon System Applications program. It is a technical paper arguing that spacecraft driven by deuterium thermonuclear reactions could be built with current science and could reach the outer solar system. It covers magnetic insulation, ignition by proton beams, a Super Marx generator and conjectured chemical superexplosives. It does not discuss any UFO sightings.

From the source: Release of 2026-09-18 Incident: 3/11/10, Las Vegas, Nevada. Released with redactions. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD examines advanced nuclear propulsion for crewed deep-space travel and argues that human missions beyond the Moon would require propulsion systems with both very high thrust and very high specific impulse, which the author contends are difficult to achieve with conventional chemical, nuclear-thermal, and nuclear-electric systems. The report focuses on concepts derived from Project Orion, the discontinued General Atomics nuclear pulse propulsion study sponsored first by ARPA and later by the U.S. Air Force between 1958 and 1965, in which a spacecraft would be driven by repeated nuclear explosions. In this case, the DIRD emphasizes small non-fission-triggered fusion explosions using deuterium, magnetic mirrors, and other unconventional ignition concepts intended to avoid the inefficiencies associated with small fission devices. It presents these ideas as a possible pathway to crewed missions across the solar system, while also linking them to broader visions of long-range human expansion into space. The document is exploratory in character and depends on several unproven ignition methods, enabling technologies, and engineering assumptions. Overall, it is a theoretical examination of fusion-based pulse propulsion concepts rather than as a documentary account of a technology nearing practical realization.

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extravagant in the sense that only a small fraction of the fission explosive is consumed.
This problem can be overcome through the nonfission ignition of small fusion
explosions. A first step in this direction is the nonfission ignition of deuterium-tritium
(DT) thermonuclear microexplosions, expected to be realized in the near future . This
reaction was chosen for the first proposed thermonuclear microexplosion propulsio n
concept, with the ignition done by an intense relativistic electron beam (Reference 1,
2). But because in t he DT reaction 80 percent of the energy is released into neutrons
that cannot be reflected from the spacecraft by a magnetic mirror, it was proposed to
surround the microexplosion with a neutron-absorbing hydrogen propellant, increasing
the thrust at the expense of the specific impulse. For this reason, in the "Daedalus"
interstellar probe study by the British Interplanetary Society (Reference 3), the
neutron-less helium3-deuterium (He 3-D) reaction was proposed, because for such a
mission the specific impulse should be as high as possible. But even in a He 3-D plasma,
there are a some neutron -producing DD reactions. There is no large source of He3 on
Earth, though it might exist on the surface of the Moon and in the atmosphere of
Jupiter. In the DD reaction, much less energy goes into neutrons, but it is more difficult
to ignite.
The situation is illustrated in Figure 1. On the upper left side is the experimentally
verified ignition of a DT pellet with the X-rays generated in an underground test from a
fission bomb (Centurion Halite experiment at the Nevada Test Site). For the ignition of
the DT reaction with propagation thermonuclear burn (that is, detonation), one requires
a few megajoules, with a density x radius target product, pr~ lg/cm 2 . On the upper
right side is the 15-megaton "Mike" test, where with t he Teller-U lam configuration a
large amount of li quid deuterium is ignited with a fiss ion bomb. For the DD reaction
propagating thermonuclear burn (that is, detonation), one requires that pr~ 10g/cm 2. At
the bottom is the proposed hypothetica l deuterium target, where a detonation wave in
a th in cylindrical deuterium rod is ign ited by a pulsed 107-ampere GeV proton beam,
utilizing the strong magnetic field of the beam current.
Solution in between two extremes
£~ l06J £~!0 12 J
pr~ I g/cm2 @pr~ 10 g/cm2
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Centurion - Halite (DT Pellets) Mike Test (Teller/Ulam Configuration)
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E S 109 J I ......
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pz ~ 10 g/cm2 ---
I~ 101 A
Hypothetical D-D Ignition with Super Marx Generator
Figure 1. Ignition With 107-Ampere GeV Proton Beam (Refere nce 16)
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