Hydrodynamic optical-field-ionized plasma channels
Hydrodynamic optical-field-ionized plasma channels
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DOI：
10.1103/physreve.97.053203
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发表时间：
2018-05-07
影响因子：
2.4
通讯作者：
Hooker, S. M.
中科院分区：
文献类型：
--
作者：
Shalloo, R. J.;Arran, C.;Hooker, S. M.
我们目前的实验和数值模拟表明，完全电离，低密度等离子体通道可以形成由光场电离产生的等离子体柱的流体动力学膨胀。用轴棱锥透镜模拟氢中形成的等离子体柱的流体动力学膨胀，结果表明产生了200 mm长的等离子体通道，其轴向密度为n（e）（0）= 1 × 10（17）cm（-3），最低阶模的光斑尺寸W-M接近40 μ m。这些模拟表明，产生通道所需的激光能量是适度的：每厘米通道约1 mJ。用球形透镜进行的实验证实了模拟结果，这些实验表明形成了短等离子体通道，其1.5 × 10（17）cm（-3）小于或类似于n（e）（0）小于或类似于1 × 10（18）cm（-3），61 μ m大于或类似于W-M大于或类似于33 μ m。这种类型的低密度等离子体通道似乎非常适合作为多GeV激光等离子体加速器级，能够在高脉冲重复率下长期运行。
We present experiments and numerical simulations which demonstrate that fully ionized, low-density plasma channels could be formed by hydrodynamic expansion of plasma columns produced by optical field ionization. Simulations of the hydrodynamic expansion of plasma columns formed in hydrogen by an axicon lens show the generation of 200 mm long plasma channels with axial densities of order n(e)(0) = 1 x 10(17) cm(-3) and lowest-order modes of spot size W-M approximate to 40 mu m. These simulations show that the laser energy required to generate the channels is modest: of order 1 mJ per centimeter of channel. The simulations are confirmed by experiments with a spherical lens which show the formation of short plasma channels with 1.5 x 10(17) cm(-3) less than or similar to n(e)(0) less than or similar to 1 x 10(18) cm(-3) and 61 mu m greater than or similar to W-M greater than or similar to 33 mu m. Low-density plasma channels of this type would appear to be well suited as multi-GeV laser-plasma accelerator stages capable of long-term operation at high pulse repetition rates.