一类新的单能离子谱真空等离子体膨胀的自相似解
New class of self-similar solutions for vacuum plasma expansion admitting mono-energetic ion spectra
摘要：
我们报告一类新的自相似解决方案等离子体膨胀到真空中，允许准单能离子光谱。一个简单的分析模型考虑到外部控制的热电子随时间变化的温度。当激光的时间轮廓被适当地定制时，等离子体的准中性自相似膨胀导致在相空间中的离子浓度以特定的速度，从而产生准单能谱。我们证明了这一分析预测使用一维粒子在细胞（PIC）模拟的时间依赖性的等离子体温度是由两个激光脉冲在一个合适的时间延迟拍摄在箔控制。
英文摘要：
We report a new class of self-similar solutions for plasma expanding into vacuum that allows for quasi-monoenergetic ion spectra. A simple analytical model takes into account externally controlled time-dependent temperature of the hot electrons. When the laser temporal profile is tailored properly, the quasi-neutral self-similar expansion of the plasma results in ion concentration in the phase-space at a particular velocity thus producing a quasi-monoenergetic spectrum. We prove this analytical prediction using a 1D partice-in-cell (PIC) simulation where the time-dependent plasma temperature is controlled by two laser pulses shot at a foil at a suitable time delay.
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