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首页> 外文期刊>Matter and Radiation at Extremes >Self-focusing of UV radiation in 1 mm scale plasma in a deep ablative crater produced by 100 ns, 1 GW KrF laser pulse in the context of ICF
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Self-focusing of UV radiation in 1 mm scale plasma in a deep ablative crater produced by 100 ns, 1 GW KrF laser pulse in the context of ICF

机译：在ICF的背景下，在100ns，1 gw Krf激光脉冲中产生的1 mm尺寸等离子体中的UV辐射自聚焦在ICF的背景下

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ABSTRACTExperiments at the GARPUN KrF laser facility and 2D simulations using the NUTCY code were performed to study the irradiation of metal and polymethyl methacrylate (PMMA) targets by 100 ns UV pulses at intensities up to 5 × 10~(12) W cm~(?2). In both targets, a deep crater of length 1 mm was produced owing to the 2D geometry of the supersonic propagation of the ablation front in condensed matter that was pushed sideways by a conical shock wave. Small-scale filamentation of the laser beam caused by thermal self-focusing of radiation in the crater-confined plasma was evidenced by the presence of a microcrater relief on the bottom of the main crater. In translucent PMMA, with a penetration depth for UV light of several hundred micrometers, a long narrow channel of length 1 mm and diameter 30 μ m was observed emerging from the crater vertex. Similar channels with a length-to-diameter aspect ratio of ～1000 were produced by a repeated-pulse KrF laser in PMMA and fused silica glass at an intensity of ～10~(9) W cm~(?2). This channel formation is attributed to the effects of radiation self-focusing in the plasma and Kerr self-focusing in a partially transparent target material after shallow-angle reflection by the crater wall. Experimental modeling of the initial stage of inertial confinement fusion-scale direct-drive KrF laser interaction with subcritical coronal plasmas from spherical and cone-type targets using crater-confined plasmas seems to be feasible with increased laser intensity above 10~(14) W cm~(?2).
机译：在Garpun KRF激光设施和使用Nutcy Code的2D模拟的AbsertureStiments进行了使用100ns UV脉冲在高达5×10〜（12）W cm〜（？ 2）。在两个靶标中，由于锥形冲击波被横向推动的冷凝物的烧蚀前沿的超声波展示的2D几何形状，产生了长度1mm的深陨位。通过在主要火山口的底部存在微型传道缓解，通过在火山口局限性等离子体中产生的热自聚焦引起的激光束的小尺寸丝。在半透明PMMA中，对于紫外线的渗透深，从陨石坑顶点出来，观察到长度为1mm和直径30毫升的长窄通道。通过在PMMA中的重复脉冲KRF激光器和熔融二氧化硅玻璃中的重复脉冲KRF激光，强度为〜10〜（9）Wcm〜（α2）的熔融二氧化硅玻璃的相似通道。该频道形成归因于辐射自聚焦在火山口壁的浅角度反射之后散热在等离子体和克尔自聚焦中的施加在部分透明的目标材料中。使用火山飞口局压等离子体与亚临界冠状等级的惯性限制融合型直接驱动KRF激光相互作用的初始阶段的实验建模似乎是可行的激光强度高于10〜（14）W cm 〜（？2）。

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