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This Defense Intelligence Reference Document, prepared in fiscal year 2010 by the Defense Intelligence Agency's Defense Warning Office under the Advanced Aerospace Weapon System Applications (AAWSA) Program, reviews aneutronic fusion as a way to propel spacecraft. It compares chemical, ion, fission, fusion and antimatter propulsion, and it also covers radiation shielding and relativistic rocket calculations. It looks at research needs over the next 30 years for missions from low Earth orbit to Mars, Jupiter and Alpha Centauri.
From the source:Release of 2026-09-18 Incident: 11/1/10, 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 surveys aneutronic fusion as a possible advanced space-propulsion method, focusing on fusion reactions that release most of their energy in charged particles rather than neutrons and therefore offer potential advantages over more neutron-intensive fusion concepts, especially in radiation shielding, direct energy conversion, and thrust generation. The report reviews the underlying rocket physics, compares candidate fusion fuels and ignition conditions, and gives particular attention to proton-boron and related schemes, while also discussing Bussard’s concepts and other fusion projects as representative development paths. It also makes clear that the central obstacle remains ignition and sustained net-energy fusion under practical conditions, and it notes additional problems such as x-ray energy losses from the hot plasma, extreme temperature requirements, and the gap between theoretical specific impulse and what proposed systems had demonstrated experimentally. Overall, the document presents aneutronic fusion propulsion as an attractive long-range concept for deep-space travel, but one whose practical realization still depended on major unresolved advances in fusion engineering.
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Table 3 : Specific Impulse for Selected Drives
Specific Impulse for Selected Drives
lsp/c lsp (sec)
Chemical Rocket {Stages 2,3, Saturn V) 0.000014 421
Hall Effect Ion Drive 0. 000082 2,500
VASI MR Ion Drive 0.000196 6,000
Nuclear Fission Drive 0.040000 1,223, 242
Bussard Aneutronic Fusion Drive 0. 000196 6,000
Ideal Fusion Drive (p --> He) 0.119000 3, 639,144
Antimatter, proton/antiproton 0.600000 18,348,624
Antimatter, electron/positron 1.000000 30,581,040
The performance of the Bussard Aneutronic Drive used in the example actually has a
much lower specific impulse as indicated in Table 3. Considerable work will be needed
to design an aneutronic drive that can approach the maximum theoretical value of lsp/C
= 0.119. Research challenges in the development of aneutronic drives should be
studied over the next 20 to 30 years and include the following:
• Fusion Initiation: Reliable fusion of p + 11 B has only been demonstrated in a
laboratory setting using a picoseconds laser in 2005 by V. S. Belyaev in Russia. The
particle energies required to initiate p-B fusion are 300 keV, which corresponds to
about 3.3 billion degrees C. For comparison, the easiest fusion reaction to initiate is
D-T which requires only 66 keV or 730 million degrees C. D-T fusion is still difficult
to initiate in the laboratory, and the energy generated by D-T fusion still exceeds
the energy required to initiate the process with the exception of thermonuclear
devices. Work on inertial confinement fusion, electrostatic confinement, magnetic
confinement, laser ablation, and other techniques are under investigation at
laboratories around the world and reliable, efficient fusion initiation devices will be
developed over the upcoming 30 years.
• Materials: New materials will be required to survive the temperatures and
radiation within a fusion propulsion system ignition chamber and nozzle (if used).
These materials must effectively stop the leakage of gamma rays from fusion
production and x-rays emitted through bremmstrahlung due to electron
impingement on the chamber walls. Materials development should be a major focus
for research.
• Generation of High-Tesla Electromagnets: Powerful electromagnets will be
required to direct positively and negatively charged fusion products into generating
thrust or for direct conversion into electricity. Superconducting magnets are viable,
although they will be located near the fusion reactor-high temperatures and
gamma radiation will heat and embrittle the material. Work will be needed to create
magnets capable of generating 10 T magnetic fields.
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