Energy transport in short-pulse-laser-heated targets measured using extreme ultraviolet laser backlighting.
Energy transport in short-pulse-laser-heated targets measured using extreme ultraviolet laser backlighting.
复制标题
使用极紫外激光背光测量短脉冲激光加热目标中的能量传输。
DOI：
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
D. Ros
中科院分区：
文献类型：
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作者：
L. Wilson;G. Tallents;J. Pasley;D. Whittaker;S. Rose;O. Guilbaud;K. Cassou;S. Kazamias;S. Daboussi;M. Pittman;O. Delmas;J. Demailly;O. Neveu;D. Ros
激光驱动固体靶中热电子输运的准确表征和超热电子加热的确定是目前国家点火装置正在进行的旨在利用激光实现热核聚变点火的实验中的两个非常重要的问题。由电子热传导引起的电离可以导致材料的不透明度显著下降，一旦束缚-自由光电离在能量上不再可能。我们发现，这种不透明度的下降使得能够测量13.9 nm的极紫外（EUV）激光脉冲的透射率，以作为薄（50 nm）铁层与50 nm厚的聚对二甲苯-N（CH）覆盖层在辐照度为3×10（16）Wcm（-2）的35 fs脉冲辐照下加热的特征。将辐照后不同时间的EUV透射率测量结果与流体代码模拟结果进行比较表明，靶被热电子（约为激光能量的10%）瞬间加热，然后进行热传导，通量限制器为0.05。
The accurate characterization of thermal electron transport and the determination of heating by suprathermal electrons in laser driven solid targets are both issues of great importance to the current experiments being performed at the National Ignition Facility, which aims to achieve thermonuclear fusion ignition using lasers. Ionization, induced by electronic heat conduction, can cause the opacity of a material to drop significantly once bound-free photoionization is no longer energetically possible. We show that this drop in opacity enables measurements of the transmission of extreme ultraviolet (EUV) laser pulses at 13.9 nm to act as a signature of the heating of thin (50 nm) iron layers with a 50-nm thick parylene-N (CH) overlay irradiated by 35-fs pulses at irradiance 3×10(16) Wcm(-2). Comparing EUV transmission measurements at different times after irradiation to fluid code simulations shows that the target is instantaneously heated by hot electrons (with approximately 10% of the laser energy), followed by thermal conduction with a flux limiter of ≈0.05.
18.9 nm 类镍钼 X 射线激光器的掠入射泵浦
DOI：
10.1140/epjst/e2009-01134-3
发表时间：
2009
期刊：
The European Physical Journal Special Topics
影响因子：
--
作者：
Booth N
通讯作者：
Booth N
激光等离子体中热致密物质的极紫外干涉测量。
影响因子：
3.6
作者：
Gartside LM
通讯作者：
Gartside LM