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首页> 外文会议>Soft X-Ray Lasers and Applications VII; Proceedings of SPIE-The International Society for Optical Engineering; vol.6702 >21nm x-ray laser Thomson scattering of laser-heated exploding foil plasmas
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21nm x-ray laser Thomson scattering of laser-heated exploding foil plasmas

机译：激光加热的爆炸箔等离子体的21nm X射线激光汤姆森散射

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摘要

Recent experiments were carried out on the Prague Asterix Laser System (PALS) towards the demonstration of a soft x-ray laser Thomson scattering diagnostic for a laser-produced exploding foil. The Thomson probe utilized the Ne-like zinc x-ray laser which was double-passed to deliver ～1 mJ of focused energy at 21.2 nm wavelength and lasting ～100 ps. The plasma under study was heated single-sided using a Gaussian 300-ps pulse of 438-nm light (3w of the PALS iodine laser) at laser irradiances of 10~(13) - 10~(14) W cm~(-2). Electron densities of 10~(20) -10~(22) cm~(-3) and electron temperatures from 200 to 500 eV were probed at 0.5 or 1 ns after the peak of the heating pulse during the foil plasma expansion. A flat-field 1200 line mm~(-1) variable-spaced grating spectrometer with a cooled charge-coupled device readout viewed the plasma in the forward direction at 30° with respect to the x-ray laser probe. We show results from plasmas generated from ～1 μm thick targets of Al and polypropylene (C_3H_6). Numerical simulations of the Thomson scattering cross-sections will be presented. These simulations show electron peaks in addition to a narrow ion feature due to collective (incoherent) Thomson scattering. The electron features are shifted from the frequency of the scattered radiation approximately by the electron plasma frequency ±w_(pe) and scale as n_e~(1/2).
机译：最近在布拉格Asterix激光系统（PALS）上进行了实验，以演示用于激光生产的爆炸箔的软X射线激光Thomson散射诊断仪。 Thomson探头使用了类似Ne的锌X射线激光，该激光经过两次通过后可在21.2 nm波长下提供约1 mJ的聚焦能量，持续时间约100 ps。使用438 nm高斯300 ps脉冲（PALS碘激光器的3w）以10〜（13）-10〜（14）W cm〜（-2）的高斯脉冲对被研究的等离子体进行单侧加热。 ）。在箔等离子体膨胀期间，在加热脉冲的峰值之后的0.5或1 ns处探测到10〜（20）-10〜（22）cm〜（-3）的电子密度和200至500 eV的电子温度。具有冷却的电荷耦合器件读数的平场1200线mm〜（-1）可变间隔光栅光谱仪，相对于X射线激光探头在30°的正向方向上查看了等离子体。我们显示了从约1μm厚的Al和聚丙烯（C_3H_6）靶产生的等离子体的结果。将介绍Thomson散射截面的数值模拟。这些模拟显示了由于集体（非相干）汤姆森散射而导致的电子峰以及狭窄的离子特征。电子特征从散射辐射的频率偏移大约电子等离子体频率±w_（pe），并且缩放为n_e〜（1/2）。

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