| Autor: |
Yong-sheng Huang, Xiao-fei Lan, Xiao-jiao Duan, Zhi-xin Tan, Nai-yan Wang, Yi-jin Shi, Xiu-zhang Tang, Ye-xi He |
| Předmět: |
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| Zdroj: |
Physics of Plasmas; Oct2007, Vol. 14 Issue 10, p103106, 6p, 4 Graphs |
| Abstrakt: |
A model, called the Step Model, is proposed to describe hot-electron recirculation. A formula to estimate electron density at the rear side sheath is described. With a fixed initial hot-electron density for some target thicknesses, the results from the Step Model are compared with several experiments. The influences of laser pulse absorption efficiency, laser pulse duration, the opening angle of hot-electrons, hot-electron recirculation, and target thickness on the ion acceleration are discussed. When the target thickness is far less than the laser focus radius, the initial electron density will be proportional to the laser pulse absorption efficiency, and the angular effect and the thickness effect can both be ignored. For any target thickness, the maximum ion velocity accelerated by the rear side sheath can be calculated using the Step Model. As an application to some experiments, the Step Model provides a half-analytic method to achieve the dependence of the laser pulse absorption efficiency on target thickness and the influence of amplified spontaneous emission (ASE) duration on the laser absorption efficiency. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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