Ion acceleration at two collisionless shocks in a multicomponent plasma
| Autor: | Nigel Woolsey, R. Kumar, Leonard N. K. Döhl, Takayoshi Sano, Alessio Morace, Youichi Sakawa |
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| Rok vydání: | 2021 |
| Předmět: |
Hydrogen
FOS: Physical sciences chemistry.chemical_element Flux 01 natural sciences Instability 010305 fluids & plasmas Ion Physics - Space Physics Physics::Plasma Physics 0103 physical sciences 010306 general physics High Energy Astrophysical Phenomena (astro-ph.HE) Physics Plasma Physics - Plasma Physics Space Physics (physics.space-ph) Shock (mechanics) Plasma Physics (physics.plasm-ph) Particle acceleration chemistry Physics::Space Physics Atomic physics Astrophysics - High Energy Astrophysical Phenomena Vector potential |
| Zdroj: | Physical Review E. 103 |
| ISSN: | 2470-0053 2470-0045 1550-2376 |
| DOI: | 10.1103/physreve.103.043201 |
| Popis: | Intense laser-plasma interactions are an essential tool for the laboratory study of ion acceleration at a collisionless shock. With two-dimensional particle-in-cell calculations of a multicomponent plasma we observe two electrostatic collisionless shocks at two distinct longitudinal positions when driven with a linearly polarized laser at normalized laser vector potential ${a}_{0}$ that exceeds 10. Moreover, these shocks, associated with protons and carbon ions, show a power-law dependence on ${a}_{0}$ and accelerate ions to different velocities in an expanding upstream with higher flux than in a single-component hydrogen or carbon plasma. This results from an electrostatic ion two-stream instability caused by differences in the charge-to-mass ratio of different ions. Particle acceleration in collisionless shocks in multicomponent plasma are ubiquitous in space and astrophysics, and these calculations identify the possibility for studying these complex processes in the laboratory. |
| Databáze: | OpenAIRE |
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