Burst intensification by singularity emitting radiation in multi-stream flows
| Autor: | Yoshiaki Kato, K. Ogura, Noboru Hasegawa, E. N. Ragozin, Masaharu Nishikino, David Neely, Alexander S. Pirozhkov, Tatiana Pikuz, Kiminori Kondo, Masaki Kando, T. Zh. Esirkepov, Sergei V. Bulanov, Hiroyuki Daido, A. Sagisaka, Yuji Fukuda, Takashi Imazono, Tetsuya Kawachi, James Koga, Paul R. Bolton, Yukio Hayashi, Hideyuki Kotaki, A. Ya. Faenov, Hiromitsu Kiriyama |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Shock wave
Physics Multidisciplinary Gravitational wave Astrophysics::High Energy Astrophysical Phenomena lcsh:R FOS: Physical sciences lcsh:Medicine Radiation 01 natural sciences Article Physics - Plasma Physics 010305 fluids & plasmas Computational physics Plasma Physics (physics.plasm-ph) Wavelength Singularity Relativistic plasma 0103 physical sciences lcsh:Q Gravitational singularity lcsh:Science 010306 general physics QC Relativistic speed |
| Zdroj: | Scientific Reports, Vol 7, Iss 1, Pp 1-10 (2017) Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | In various media the elementary components can emit traveling waves such as electromagnetic, gravitational or acoustic types. If these elementary emitters are synchronized, the resulting emission is coherent. Moreover, the faster the emitters approach an observer, the more intense and directional their apparent emission is, with associated frequency increase. Multi-stream flows ubiquitously occur in media (such as with shock waves and jets in astrophysical and laboratory plasmas) and produce fast moving density singularities, where high concentration and synchronism can bring constructive interference. However, a singularity emitting such characteristic coherent radiation has not been demonstrated yet. We show this general phenomenon in laser-driven relativistic plasma, which is an ideal medium for realizing these effects in the laboratory under controllable conditions. Our experiments and simulations reveal bright coherent soft x-ray radiation from nanoscale electron density singularities in multi-stream plasma. They constitute a new compact x-ray source of ultrashort duration, demanded in numerous applications. In general, singularities can be bright sources of other types of traveling waves. Thus our findings open new opportunities in different fields of science. For example, gravitational wave generation, as proposed in ultrahigh-energy accelerators, can be significantly enhanced by intentionally induced density singularities in the particle bunches. Further, we anticipate that multi-stream flows in cosmic media can produce intense bursts of coherent electromagnetic and/or gravitational waves, especially at longer wavelengths which facilitate constructive interference. We can then expect to observe more directional short wavelength bursts from cosmic emitters approaching at relativistic speeds. Thus, we present a new framework for interpreting a broad range of experimental results. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|