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Observation of parametric instabilities in the quarter critical density region driven by the Nike KrF laser

机译：观察Nike KrF激光器驱动的四分之一临界密度区域中的参数不稳定性

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摘要

The krypton-fluoride (KrF) laser is an attractive choice for inertial confinement fusion due to its combination of short wavelength (λ = 248 nm), large bandwidth (up to 3 THz), and superior beam smoothing by induced spatial incoherence. These qualities improve the overall hydrodynamics of directly driven pellet implosions and should allow use of increased laser intensity due to higher thresholds for laser plasma instabilities when compared to frequency tripled Nd:glass lasers (λ = 351 nm). Here, we report the first observations of the two-plasmon decay instability using a KrF laser. The experiments utilized the Nike laser facility to irradiate solid plastic planar targets over a range of pulse lengths (0.35 ns ≤ τ ≤ 1.25 ns) and intensities (up to 2 × 10 15 W / cm ~2). Variation of the laser pulse created different combinations of electron temperature and electron density scale length. The observed onset of instability growth was consistent with the expected scaling that KrF lasers have a higher intensity threshold for instabilities in the quarter critical density region.
机译：氟化k（KrF）激光器具有短波长（λ= 248 nm），大带宽（高达3 THz）和由诱导的空间不相干性带来的出色光束平滑性能，是惯性约束融合的诱人选择。这些质量改善了直接驱动的丸状内爆的整体流体力学，并且与三倍频Nd：玻璃激光器（λ= 351 nm）相比，由于更高的激光等离子体不稳定性阈值，应允许使用更高的激光强度。在这里，我们报告使用KrF激光对两等离激元衰减不稳定性的首次观察。实验利用耐克激光设备在一定范围的脉冲长度（0.35 ns≤τ≤1.25 ns）和强度（最高2×10 15 W / cm〜2）上照射固体塑料平面靶。激光脉冲的变化产生了电子温度和电子密度标度长度的不同组合。观察到的不稳定性增长的开始与预期的比例一致，即KrF激光器对四分之一临界密度区域的不稳定性具有更高的强度阈值。

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