Fast Heating of High-Density Plasmas with a Reentrant Cone Concept
| Autor: | Peter Norreys, Ryosuke Kodama, Yasuhiko Sentoku, R. B. Campbell |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Physics
Nuclear and High Energy Physics Electron density 020209 energy Mechanical Engineering 02 engineering and technology Electron Plasma 01 natural sciences 010305 fluids & plasmas Magnetic field law.invention Ignition system Thermalisation Nuclear Energy and Engineering Filamentation Physics::Plasma Physics law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Relativistic electron beam General Materials Science Atomic physics Civil and Structural Engineering |
| Zdroj: | Fusion Science and Technology. 49:316-326 |
| ISSN: | 1943-7641 1536-1055 |
| DOI: | 10.13182/fst06-a1151 |
| Popis: | A reentrant cone concept for efficient heating of high-density plasmas has been studied as an advanced fast ignition scheme. The roles of the reentrant cone, as indicated by particle-in-cell (PIC) code simulations and confirmed by basic experiments, are reviewed, particularly the efficient collection and guidance of the laser light into the cone tip and the direction of the energetic electrons into the high-density region. It has been shown that the energetic electrons converge to the tip of the cone as a result of the surface electron flow guided by self-generated quasi-static magnetic fields and electrostatic sheath fields. As a result, the energetic electron density at the tip is locally greater than the case of using an open geometry such as a normal flat foil target. Using these advantageous properties of the reentrant cone, efficient fast heating of imploded high-density plasmas has been demonstrated in integrated fast ignition experiments. A hybrid PIC code (LSP) has been used to understand the relativistic electron beam thermalization and subsequent heating of highly compressed plasmas. The simulation results are in reasonable agreement with the integrated experiments. Anomalous stopping appears to be present and is created by the growth and saturation of an electromagnetic filamentation mode that generates a strong back-electromagnetic force impeding energetic electrons. |
| Databáze: | OpenAIRE |
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