Opachich Y P, Heeter R F, Barrios M A, Garcia E M, Craxton R S, King J A, Liedahl D A, McKenty P W, Schneider M B, May M J, Zhang R, Ross P W, Kline J L, Moore A S, Weaver J L, Flippo K A, Perry T S
National Security Technologies, LLC, Livermore, California 94550, USA.
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Phys Plasmas. 2017 Jun;24(6):063301. doi: 10.1063/1.4985076. Epub 2017 Jun 8.
Direct drive implosions of plastic capsules have been performed at the National Ignition Facility to provide a broad-spectrum (500-2000 eV) X-ray continuum source for X-ray transmission spectroscopy. The source was developed for the high-temperature plasma opacity experimental platform. Initial experiments using 2.0 mm diameter polyalpha-methyl styrene capsules with ∼20 m thickness have been performed. X-ray yields of up to ∼1 kJ/sr have been measured using the Dante multichannel diode array. The backlighter source size was measured to be ∼100 m FWHM, with ∼350 ps pulse duration during the peak emission stage. Results are used to simulate transmission spectra for a hypothetical iron opacity sample at 150 eV, enabling the derivation of photometrics requirements for future opacity experiments.
在国家点火装置上进行了塑料胶囊的直接驱动内爆，以提供用于X射线透射光谱的广谱（500 - 2000 eV）X射线连续光源。该光源是为高温等离子体不透明度实验平台开发的。已使用直径2.0毫米、厚度约20微米的聚α-甲基苯乙烯胶囊进行了初步实验。使用丹特多通道二极管阵列测量到的X射线产额高达约1 kJ/sr。测量得到背光源尺寸在峰值发射阶段约为100微米半高宽，脉冲持续时间约为350皮秒。这些结果用于模拟150 eV下假设的铁不透明度样品的透射光谱，从而能够推导未来不透明度实验的光度学要求。
