Quasimonoenergetic proton bunch generation by dual-peaked electrostatic-field acceleration in foils irradiated by an intense linearly polarized laser.
Quasimonoenergetic proton bunch generation by dual-peaked electrostatic-field acceleration in foils irradiated by an intense linearly polarized laser.
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DOI：
10.1103/physrevlett.105.065003
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发表时间：
2010-08
影响因子：
8.6
通讯作者：
H. Zhuo;Z. Chen;W. Yu;Z. Sheng;M. Yu;Z. Jin;R. Kodama
中科院分区：
文献类型：
--
作者：
H. Zhuo;Z. Chen;W. Yu;Z. Sheng;M. Yu;Z. Jin;R. Kodama
结果表明，在适当的薄箔厚度和激光强度下，线偏振超强激光辐照薄箔可以实现质子的稳定加速。由激光有质动力的振荡和非振荡分量产生的双峰静电场在箔表面周围形成。这个场结合了辐射压力加速和靶法向鞘加速，产生了一个单一的准单能离子束。得到了该机制起作用的判据，并通过二维粒子模拟进行了验证。在激光强度为∼5.5×10(22)W/cm(2)的条件下，获得了∼能量为100 MeV、空间发散小于4°、能量转换效率为∼50%的准单能GeV质子束。
It is found that stable proton acceleration from a thin foil irradiated by a linearly polarized ultraintense laser can be realized for appropriate foil thickness and laser intensity. A dual-peaked electrostatic field, originating from the oscillating and nonoscillating components of the laser ponderomotive force, is formed around the foil surfaces. This field combines radiation-pressure acceleration and target normal sheath acceleration to produce a single quasimonoenergetic ion bunch. A criterion for this mechanism to be operative is obtained and verified by two-dimensional particle-in-cell simulation. At a laser intensity of ∼5.5×10(22) W/cm(2), quasimonoenergetic GeV proton bunches are obtained with ∼100 MeV energy spread, less than 4° spatial divergence, and ∼50% energy conversion efficiency from the laser.