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国家自然科学基金(10974250)

作品数:5 被引量:7H指数:1
相关作者:张杰李玉同魏志义刘峰郑君更多>>
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利用激光离焦的方法优化超强激光驱动的质子加速被引量:5
2011年
在中国科学院物理研究所"极光Ⅱ号"飞秒激光装置上,对激光与薄膜靶相互作用产生的靶后质子束特性进行了实验研究.结果发现,在主脉冲前存在较强的飞秒预脉冲的情况下,通过适当地对激光束散焦,可以使质子束的转换效率提高3个数量级,并同时改善质子束的准直性.分析表明,激光散焦的方法可以有效地抑制预脉冲的流体力学效应对质子加速的负面影响,从而提高质子的转换效率.此外,粒子模拟还发现,散焦量增大时可以产生更多的中低能超热电子,这也有利于建立高质量的质子加速电场.
徐妙华李玉同刘峰张翼林晓宣王首钧孟立民王兆华郑君盛政明魏志义李英骏张杰
Transmission Degradation of Femtosecond Laser Pulses in Opened Cone Targets被引量:1
2012年
Irradiated by femtosecond laser pulses with different energies, opened cone targets behave very differently in the transmission of incident laser pulses. The targets, each with an opening angle of 71° and an opening of 5 μm, are fabricated using standard semiconductor technology. When the incident laser energy is low and no pre-plasma is generated on the side walls of the cones, the cone target acts like an optical device to reflect the laser pulse, and 15% of the laser energy can be transmitted through the cones. In contrast, when the incident laser energy is high enough to generate pre-plasmas by the pre-pulse of the main pulse that fills the inner cone, the cone with the plasmas will block the transmission of the laser, which leads to a decrease in laser transmission compared with the low-energy case with no plasma. Simulation results using optical software in the low-energy case, and using the particle-in-cell code in the high-energy case, are primarily in agreement with the experimental results.
LIU FengLIN XiaoxuanLIU BichengDING WenjunDU FeiLI YutongMA JinglongLIU XiaolongSHENG ZhengmingCHEN LimingLU XinDONG QuanliWANG WeiminWANG ZhaohuaWEI ZhiyiCHEN JiaerZHANG Jie
多脉冲序列飞秒钛宝石激光的啁啾脉冲放大
2012年
在数太瓦钛宝石啁啾脉冲放大系统中(极光Ⅱ升级装置),对多脉冲序列的放大过程进行了详细的实验研究,获得了多脉冲序列的放大输出.每一个放大脉冲串中包含有19个独立的飞秒单脉冲,其相邻间隔为14.8 ns,对应的重复频率为67.5 MHz.脉冲串的总能量约为122 mJ,各单脉冲能量从20 mJ指数衰减至0.5 mJ,脉宽约为60fs,对应的峰值功率约为10^(11)—10^(10)W.这种脉冲序列在产生长寿命激光等离子体、激光微加工等方面有重要应用前景.
葛绪雷马景龙郑轶鲁欣蒋刚李玉同魏志义张杰
关键词:脉冲序列啁啾脉冲放大普克尔盒
Acceleration of Protons from a Double-Layer or Multi-Ion-Mixed Foil Irradiated by Ultraintense Lasers
2010年
Acceleration of protons by the radiation pressure of a circularly polarized laser pulse with the intensity up to 1021 W/cm^2 from a double-layer or multi-ion-mixed thin foil is investigated by two-dimensional particle-in-cell simulations. The double-layer foil is composed of a heavy ion layer and a proton layer. It is found that the radiation pressure acceleration can be classified into three regimes according to the laser intensity due to the different critical intensities for laser transparency with different ion species. When the laser intensity is moderately high, the laser pushes the electrons neither so slowly nor so quickly that the protons can catch up with the electrons, while the heavy ions cannot. Therefore, the protons can be accelerated efficiently. The proton beam generated from the double-layer foil is of better quality and higher energy than that from a pure proton foil with the same areal electron density. When the laser intensity is relatively low, both the protons and heavy ions are accelerated together, which is not favorable to the proton acceleration. When the laser intensity is relatively high, neither the heavy ions nor the protons can be accelerated efficiently due to the laser transparency through the target.
王伟民盛政明於陆勒李玉同KAWATA Shigeo张杰
The influence of target material and thickness on proton energy and angular distribution被引量:1
2013年
The paper has studied the influence of target material and thickness on energy and angular distributions of the protons generated by using an 800 rim, 60 fs, 0.24 J laser pulse to irradiate solid target foils. The results show that the initial density and thickness of the targets will affect the formation of the acceleration sheath fields in the target normal direction. For the same target thickness, using lower density target materials can obtain a higher proton maximum energy. However, lower density targets tend to be deformed due to the shock waves launched by the laser pulses, making the proton spatial distribution more divergent.
SU LuNingLIU BiChengLIN XiaoXuanLIU FengDU FeiLIU XiaoLongZHENG YiGE XuLeiLI YuTongSHENG ZhengMingCHEN LiMingWANG WeiMinMA JingLongLU XinWEI ZhiYiCHEN JiaErZHANG Jie
关键词:LASER-DRIVENPROTONACCELERATION
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