| Nonlinear Signal Classification Using Dynamical Systems Theory |
07 JUL 96 |
9 pages |
| Authors:
James Kadtke; CALIFORNIA UNIV SAN DIEGO LA JOLLA INST FOR PURE AND APPLIED PHYSICAL SCIENCE S
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| Transport in Nonneutral Plasmas |
28 JUN 96 |
8 pages |
| Authors:
C. F. Driscoll; CALIFORNIA UNIV SAN DIEGO LA JOLLA INST FOR PURE AND APPLIED PHYSICAL SCIENCE S
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 | The AASERT supplement N00014-93-1-0824 provided partial support for three graduate students. The students performed research on an existing pure electron plasma containment apparatus, on a new laser diagnosed ion plasma apparatus, and on a new camera diagnosed electron apparatus. The transport experiments recently demonstrated that energy and particle transfer across magnetic fields can be greatly enhanced due to long range interparticle collisions, stimulating new theory work. The experiments on collective ... |
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| Pure Electron Plasmas Near Thermal Equilibrium |
12 APR 96 |
13 pages |
| Authors:
C. F. Driscoll; CALIFORNIA UNIV SAN DIEGO LA JOLLA INST FOR PURE AND APPLIED PHYSICAL SCIENCE S
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| This report gives an overview of the experimental and theoretical research supported by ONR grant N00014-89-J-1714 from 1989 to 1995. The research focused on waves, transport, and equilibrium of magnetically confined single- species plasmas. Two new apparatuses were built: a laser-diagnosed ion apparatus targeted towards 'test-particle' measurements of cross-field transport from long-range ion-ion collisions; and a camera-diagnosed electron apparatus which gives quantitative data on 2-dimensional fluid instabilities, vortices, turbulence and ... |
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| Knot Invariants and Cellular Automata |
04 MAY 93 |
7 pages |
| Authors:
David A. Meyer; CALIFORNIA UNIV SAN DIEGO LA JOLLA INST FOR PURE AND APPLIED PHYSICAL SCIENCE S
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| The goal of this project was to build on an understanding of the connections between knot invariants, exactly solvable statistical mechanics models and discrete dynamical systems toward an answer to the question of how early and robust thermodynamic behavior appears in lattice gas automata. Preliminary work focussed on developing an understanding of state models in knot theory and their relation to statistical mechanics models. Rather than considering the complicated and ... |
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| Experiments on the Physics of Turbulent Mixing in Stably Stratified Ocean Layers |
30 SEP 92 |
4 pages |
| Authors:
Charles W. Van Atta; CALIFORNIA UNIV SAN DIEGO LA JOLLA INST FOR PURE AND APPLIED PHYSICAL SCIENCE S
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| Our research goals are to understand, quantify, and parameterize mixing processes in stably stratified fluids. The research is intended to provide a sound scientific basis for making accurate quantitative estimates of ocean mixing from limited observations at sea. |
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| Large Motions of the Magnetization in Magnetically Ordered Media |
30 SEP 91 |
3 pages |
| Authors:
Harry Suhl; CALIFORNIA UNIV SAN DIEGO LA JOLLA INST FOR PURE AND APPLIED PHYSICAL SCIENCE S
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| Two topics: (1) Interaction of domain wall motion with elementary excitations, and the resulting damping and instability mechanisms. The limiting wall velocity is very nearly equal to the speed of the particular spin wave whose group and phase velocities are equal. When the driving field is large enough to induce this limiting velocity, the system achieves a fixed point, a state in which a group of non-synchronous spin-waves is excited ... |
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| Pure Electron Plasmas near Thermal Equilibrium |
NOV 90 |
40 pages |
| Authors:
J. H. Malmberg; C. F. Driscoll; T. M. O'Neil; CALIFORNIA UNIV SAN DIEGO LA JOLLA INST FOR PURE AND APPLIED PHYSICAL SCIENCE S
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| Plasmas are the central element in many physical systems, including devices to generate radiation or high tensity beams of particles. Plasma effects are important in modern high current accelerator concepts, especially collective effect accelerators. They are central to the thermonuclear reactor problem, and of course outdoor plasmas dominate the physics of a large portion of the known universe. The physics of these systems can be very complex, and most of ... |
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| Large Motions of the Magnetization in Magnetically Ordered Media |
30 SEP 90 |
3 pages |
| Authors:
Harry Suhl; CALIFORNIA UNIV SAN DIEGO LA JOLLA INST FOR PURE AND APPLIED PHYSICAL SCIENCE S
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| Transport of Nonneutral Plasmas |
JUN 90 |
15 pages |
| Authors:
J. H. Malmberg; C. F. Driscoll; T. M. O'Neil; CALIFORNIA UNIV SAN DIEGO LA JOLLA INST FOR PURE AND APPLIED PHYSICAL SCIENCE S
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| The research program includes both ongoing experiments and theory on transport in pure electron plasmas; and the design, construction and operation of a new pure ion plasma apparatus. Recent experiments on the electron apparatus have elucidated the transport and turbulence associated with diocotron instabilities and vortex structures, and have measured the vortex pairing instability in detail. Recent theory work has analyzed the newly observed diocotron instability, analyzed negative temperature 2D ... |
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| Development of a Plasma Pinch Photocathode |
89 |
16 pages |
| Authors:
John F. Asmus; CALIFORNIA UNIV SAN DIEGO LA JOLLA INST FOR PURE AND APPLIED PHYSICAL SCIENCE S
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| The need in advanced Liniacs is for a high-performance (emittance, current, and life) cathode that will not poison in the only moderately good vacuums of such systems. Our approach embodies the durability of an unsensitized metal photocathode that is illuminated by a high-Z, high-density plasma pinch formed from a liquid-jet source in vacuum. The principal advantage of this pinch over a laser is both its simplicity and its ability to ... |
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| Baecklund Transformation and the Schwarzian Derivative |
01 NOV 87 |
9 pages |
| Authors:
John E. Weiss; CALIFORNIA UNIV SAN DIEGO LA JOLLA INST FOR PURE AND APPLIED PHYSICAL SCIENCE S
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| We complete the discussion of the periodic fixed points of Backlund transformations for the Korteweg-de Vries equation. It will be shown that the systems of equations defined by the KdV periodic fixed points are equivalent to the periodic Kac-Van Moerbeke systems. As a consequence, for even order fixed points, the KdV systems are equivalent to the periodic Toda lattice. The periodic fixed points of the Backlund transformation for the Boussinesq ... |
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