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This Defense Intelligence Agency reference document, dated 10 March 2010, covers inertial electrostatic confinement (IEC) fusion. It was produced in FY 2009 under the DIA's Advanced Aerospace Weapon System Applications (AAWSA) program. The report focuses on work at the University of Illinois Urbana-Champaign and reviews IEC basics, experiments, theory and applications such as neutron sources, explosives detection and space propulsion. It concludes by proposing a breakeven experiment for p-11B fusion that uses a hydrogen plasma simulation.
“The Times”31 pages
UNCLASSIFIED/ /F81il 8FFI1il.t.k Wfili 8Hklf Retrapping of Axial-Loss Particles Axial plasma particle loss escaping out through the end cone (spindle cone) of the first MCSA unit should be retrapped in the second unit because of "KAM effective scattering". This KAM scattering occurs as particles move into the null-field region within each SIEC unit. Figure 5.9 illustrates the axial magnetic field component along the centerline of a two-unit MCSA. Particles escaping from the low field region of one unit pass into the neighboring unit through the high magnetic field region between the two-units. Upon entering the IEC region, the direction of the particle is effectively randomized (i.e. Kam Scatter) when it loses adiabatic invariance in the field null region. Although particles with high velocities parallel to the magnetic field will not experience as much effective scattering, a majority of the particles entering the null field region should experience scattering and retrapping. 120 100 80 60 40 20 0 Low-Field Confinemen Re-!!1011;:, \\,, High-F,,Id -20-~J___~-0~.~5___~0___~0~.5~-- Axial Position (m) Figure 5.9. Axial Magnetic Field Strength Along Two-Unit MCSA Centerline 1 This KAM scattering process is illustrated conceptually in Figure 5.10. Before entering the null-field region, particles have a gyroradius that depends on their perpendicular velocity. If vis large compared to v11, the effective scattering angle will be large, resulting in retrapping in the case of the MCSA. In the high-field region, the gyro-radius of the particle is small. When the low-field region is reached, the particle moves in a straight-line path along the vector direction at the edge of the null region. Since the phase of the gyro motion of the particles is random at this point, the vector direction they assume in crossing the null is random. The result then can be viewed, as a random, collisionless, scattering process. Particles that stream along the axis and enter a neighboring IEC scatter in this way and become confined in the neighboring IEC (termed axial-loss "re-trapping"). This re-trapping greatly increases the confinement time of a MCSA fusion device. 58 UNCLASSIFIED/;CEiOAt OFFIGIPk IP&'i Ollk¥
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Report, from the dia collection. The PDF is mirrored here; the original link is under it. 72 pages are in the text index: search them above, or from the library's search.