Electron acceleration by an intense laser pulse inside a density profile induced by non-linear pulse evolution
| Autor: | S. A. Ghasemi, M. Pishdast, J. Yazdanpanah |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry Condensed Matter Physics Laser 01 natural sciences Atomic and Molecular Physics and Optics 010305 fluids & plasmas Pulse (physics) law.invention Nonlinear system Optics Electron acceleration law 0103 physical sciences Electrical and Electronic Engineering 010306 general physics business |
| Zdroj: | Laser and Particle Beams. 36:41-48 |
| ISSN: | 1469-803X 0263-0346 |
| Popis: | By sophisticated application of particle-in-cell simulations, we demonstrate the ultimate role of non-linear pulse evolutions in accelerating electrons during the entrance of an intense laser pulse into a preformed density profile. As a key point in our discussions, the non-linear pulse evolutions are found to be very fast even at very low plasma densities, provided that the pulse length exceeds the local plasma wavelength. Therefore, these evolutions are sufficiently developed during the propagation of typical short density scale lengths occurred at high contrast ratios of the pulse, and lead to plasma heating via stochastic acceleration in multi-waves. Further analysis of simulation data at different physical parameters indicates that the rate of evolutions increases with the plasma density leading to higher plasma heating and overgrown energetic electrons. In the same way, shortening the density scale length results into increase in the evolution rate and, simultaneously, decrease in the interaction time. This behavior can describe the observed optimum value of pre-plasma scale length for the maximum electron heating. |
| Databáze: | OpenAIRE |
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