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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 WSE 8,.Llf gridded IECs. Further, the model provides more insight into operation in the STAR mode. This effect, described earlier in Section 1, is summarized in Figure 4.11. For higher pressure operation, charge exchange severally limits the number of passes possible through the grid despite the very high effective transparency achieved by the STAR mode. This is emphasized by results for the calculations in Reference 4.7 shown in Figure 4.12. (Note that related calculations by J. Khachan discussed earlier in Section II show similar results, but emphasize the role of molecular ions at lower operating voltages). Equ1pobtnbaI Surf~ •lllffl!IJl I n,i Ion En•'VY Ol,tnbutton11at pH 2: cm grid rad lua, 50 kV, 4. mTorr 2.0E+07 .---------,, 11 UiE+o7 : 5.0800 o.c,e..oo 0 20000 4'0000 80000 ton Energy (eV) I 1.oe+o1 t-- Figure 4.11. Diagram Showing Equipotential Figure 4.12. Results for Calculations for Ion Energy Surfaces of the IEC Cathode Grid and Their Distributions pt Pass Focusing Effect on a Beam of Ions in the Star Mode Discharge at High Voltages ( > 50 keV) These computational resu Its are for the UIUC IEC "A-device" using a diameter grid with conditions of 50 kV, 10 mA, and 4-cm, and background gas pressure of 4.6 mTorr. At this pressure, charge-exchange (CX) collisions occur qu ite frequently for D+ ions. In their first pass through the IEC, about half of these ions CX within the cathode regio n and are lost. After only four passes, most of the remaining ions have lost a large amount of their original potential energy and the fusion rate from subsequent passes becomes negligible. D 2+ ions have a smaller CX cross section and it takes about 20 passes for most of the D2+ ions to lose their energy and be lost to the grid . (D 2+ ions and also D3+ ions are natura lly produced at diminishing quantities in ionization reactions along with o +. As pointed out by Kha ch an his work noted D 2+ becomes more significant in lower voltages) . In summary, the design of an optimal IEC neutron source is seen to be quite different from a power-producing IEC. In the source design, the grid parameters, grid/vessel diameter ratio, chamber diameter, surface conditions, background pressure, current, and voltage all become important parameters. In power-producing devices the ion injection parameters-- including ion current, ion energy relative to height of the well potential, the ion angular momentum, and the ion to electron temperature ratio, along with the chamber diameter ---determine performance. The calculations and simulations cited here provide much insight into these issues and also provide insight into theoretical and computational tools for IEC study. UNCLASSIFIED/ /FOR 8fflOIAL WSE 8NLY 45
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Official release, from the pursue collection. The PDF is mirrored here; the original link is above. 72 pages are in the text index: search them above, or from the library's search.