Effects of nanosecond-scale prepulse on generation of high-energy protons in target normal sheath acceleration
Autor: | X. Y. Liang, C. Wang, N. Y. Wang, Zhong-tang Xu, Jian Lu, Hong-wei Zhang, R. X. Li, Yin Shi, Yaoxiang Liu, Wenpeng Wang, Yongbin Leng, Xinchao Lu, Baifei Shen, Yongbing Xu, Yang Li |
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Rok vydání: | 2013 |
Předmět: | |
Zdroj: | Applied Physics Letters. 102:224101 |
ISSN: | 1077-3118 0003-6951 |
Popis: | A pulse cleaner based on noncollinear optical-parametric amplification and second-harmonic generation processes is used to improve the contrast of a laser of peak intensity ∼2 × 1019 W/cm2 to ∼1011 at 100 ps before the peak of the main pulse. A 7 MeV proton beam is observed when a 2.5 μm-thick Al foil is irradiated by this high-contrast laser. The maximum proton energy decreases to 2.9 MeV when a low-contrast (∼108) laser is used. Two-dimensional particle-in-cell simulations combined with MULTI simulations show that the maximum proton energy sensitively relies on the detecting direction. The ns-time-scale prepulse can bend a thin target before the main pulse arrives, which reduces maximum proton energy in the target normal sheath acceleration. |
Databáze: | OpenAIRE |
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