Documents / Official release
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/ /FOA OFFICIO Ir !Pili 0111.¥ In 1997 Miley and his group published an IEEE paper that summarized their internal ion injected grid experiments (Reference 2.3). (As noted earlier "ion injected" has been used to define the species forming a potential well. It is not to be confused with external "gun" injection where ions form the well, but are introduced from an external source). It discusses the discharge physics and plasma characteristics for various modes of operation. It explains how the STAR mode is created by the defocusing properties concave inward (towards the center core) in open grid structures. Indeed the concept is somewhat anti intuitive since one might hope for focusing "optics", but this is not possible in these configurations. (Indeed various multi-grid approaches have been studied with the objective of improving beam optics for reflection of ions, hence recirculation. See for example, Reference 2.4. When ions pass through the concave potential, all but those in the Figure 2.3. Photograph of a STAR mode discharge. The "vane'' type grid shown Is only one of a number of large opening grids designed and used for STAR mode operation of the neutron source type IEC. This parti cular design (but with variations) has been used by the UIUC, Daimler-Chrysler and Kyoto University. It Is rugged, shows little sputtering and has proven very efficient for neutron production . Materials used vary from stainless steel to Mo. exact center of the curved surface are deflected and lost. The centered ions pass through to the opposite side and go through the grid opening, then are reflected and repeat this trajectory. Subsequently ionization events along this path cause a rapid increase in the recirculating current through the center of the grid openings. This then produces the beautiful STAR mode discharge shown in Figure 2.3. The use of a pulsed power supply represents a very important way to study the physics of high current IECs without employing expensive, very large power supplies and also avoiding the need for strong cooling to remove the waste heat. The key physics point is that the beam-beam fusion rate scales as the ion current squared. Most steady state experiments employ 100s of mA, while pulsing peak values of many amps are possible. By selecting the pulse width to match or exceed the ion confinement time, typically order of ms in present devices, a quasi equilibrium is established during the pulse. This allows study of "equivalent" steady-state physics du ring the pulse. Miley's device in Reference 2.6 used a Marx bank technology to provide peak currents of l0's of amps with a ~0.1 sec width and a low repetition rate (selected to minimize cooling requirements and also reduce bank recharging requirements). Another important technology regarding the IEC vessel pumping was developed in the mid - 1990s by staff from Miley's group working at the Idaho National Environmental and Engineering Laboratory (!NEEL), Idaho with Robert A. Anderl (Reference 2.5). This work substituted a metallic hybrid getter for the external pumping on the IEC chamber. With this arrangement, the deuterium is absorbed in the getter material while the vapor pressure, hence chamber background pressure, is controlled by regulation of t he getter UNCLASSIFIED/ /FOA OFFICIAi. Wili 01\lk¥ 16
Not linked to a story yet.
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.