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This Defense Intelligence Reference Document, dated 10 March 2010, was prepared by the Defense Intelligence Agency's Defense Warning Office under the Advanced Aerospace Weapon System Applications Program. It surveys the basics, experimental status, theory and possible uses of inertial electrostatic confinement (IEC) fusion, with emphasis on work at the University of Illinois Urbana-Champaign. It covers neutron sources, explosives detection and space propulsion. It ends by proposing a 12-gun hydrogen plasma experiment meant to show breakeven conditions for p-11B fuel.
From the source:Release of 2026-09-18 Incident: 3/10/10, 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 inertial electrostatic confinement (IEC) fusion, a relatively unconventional fusion concept that uses electric fields rather than the more established magnetic or laser-based approaches to confine ions, and it reviews both the underlying physics and the experimental work associated with the concept. The report emphasizes that IEC may have nearer-term value as a compact neutron, proton, or x-ray source and as a platform for studying experimental fusion approaches, while also presenting more ambitious possibilities such as aneutronic power generation and propulsion applications. At the same time, it makes clear that the concept remained far from practical fusion power, with experimental devices operating several orders of magnitude below breakeven and with major unresolved issues involving confinement, losses, grid damage, and scale-up. Overall, the document treats IEC as a technically interesting but still highly speculative path toward fusion energy, while suggesting that its more limited spin-off applications were more plausible in the near term than its long-range power generation or propulsion applications.
UNCLASSIFIED/ /fOR Offl@IAL W&& 8Nk¥ Table 3.1. Estimated Performance Parameters or the IEC Ion Thruster Parameter IEC Ion Thruster Propellant Xenon Molecular Weight ( arnu) 131.3 Specific Impulse (s) 3000 Thrust (m.N) 34 Jet Power (W) 500 Net accelerating Potential (V) 600 Beam Current (mA) 832 Power Loss to Grid (W) :S50 Power Loss to Bresstrahlung Radiation (W) < 1 Power lo s to Ionization of Propellan t (W) 200-250 Input Power (W) Thruster Efficiency(%) 750-800 62-68 In summary, the power efficiency of the IEC thruster appears to be competitive to existing ion thrusters. What are the advantages then? These were outlined earlier and includ e a more compact design, large heat rejection area, an exhaust jet closer to quasi-neutrality, reduced neutral propellant leakage, and reduced grid erosion. Thus, the mass of the IEC jet thruster system can potentially be reduced compared to a high power Hall-type t hruster and also its lifetime can be increased significantly. In this overall context, then, the IEC thruster potentially offers an important improvement in performance for high power thruster applications. Scale- up to p- 11 B IEC Space Power Unit/Thruster The electrically driven IEC jet thruster provides an important data base for a next step p- 11 B IEC jet thruster. Jumping to p- 11 B for this application may appear overly ambitious. However, neutronless fusion seems essential in a sma ll space thruster to avoid excessive weight from shielding of electronics . Considerable experience with fusing plasmas in IECs has been gained through development of IEC DD neutron sources. These devices operate with ~80- keV D-ion beams using the non -Maxwellian character of the IEC. This important characteristic makes use of p- 11 B a realistic goal. In fact, operation with circulating ion energies at the desired 150 keV energy for p- 11B has already been achieved at the UIUC and several other laboratories working on IECs. The issue then is how to achieve adequate confinement times . The approach being pursued at UIUC is the formation of deep potential wells with angular ion injection using a differentially-pumped RF ion gun, as discussed in later sections. A proposed experiment to demonstrate p- 11B physics is discussed in Section VI. In summary, the extraction of a jet plasma from a gridded IEC opens the way to a number of added plasma applications for the IEC. This present discussion is intended to identify an orderly progress of IEC applications in commercial space power, starting with an electrically driven IEC thruster to a self-powered IEC p- 11B unit. The attractive characteristics of the electrically driven device, namely light weight, low mainten ance, UNCLASSIFIED/ /FOR OFFIQIAk Wii QrelL¥ 28
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