C E Vennari, N E Palmer, P R Nyholm, N S Bhandakar, S R Nagel, R B Petre, C V Stan, J H Eggert, D K Bradley, Y Ping, A Thomas, D C Swift, A C Carpenter, A J MacKinnon, L R Benedetti
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引用次数: 0
摘要
用于激光实验的灵活成像衍射诊断仪(FIDDLE)是美国国家点火装置(NIF)的一种新型诊断仪,旨在利用时间分辨 X 射线衍射技术观测高压下的原位固-固相变化。FIDDLE 目前集成了五个伊卡洛斯(Icarus)超快 X 射线成像仪传感器,可拍摄 2 毫微秒的快照,并可调至收集数十毫微秒的 X 射线。该平台利用 NIF 的激光功率进行激光驱动,并使用 Ge 背光箔产生 10 keV X 射线,时间为 10 ns。我们的目标是利用 FIDDLE 观察压缩过程中不同时间的衍射,以探究相变动力学。在斜坡压缩过程中,铅经历了两次固-固相变:从面心立方(FCC)到六方紧密堆积(HCP),以及从六方紧密堆积到体心立方(BCC)。将报告在 NIF 使用 FIDDLE 诊断对峰值压力为 ∼110 GPa 的 Pb 进行斜坡压缩的一些首次拍摄结果,以及单次未驱动 CeO2 校准拍摄的结果。报告还讨论了观测到的衍射的不确定性。
Time resolved x-ray diffraction using the flexible imaging diffraction diagnostic for laser experiments (FIDDLE) at the National Ignition Facility (NIF): Preliminary assessment of diffraction precision.
The Flexible Imaging Diffraction Diagnostic for Laser Experiments (FIDDLE) is a new diagnostic at the National Ignition Facility (NIF) designed to observe in situ solid-solid phase changes at high pressures using time resolved x-ray diffraction. FIDDLE currently incorporates five Icarus ultrafast x-ray imager sensors that take 2 ns snapshots and can be tuned to collect X-rays for tens of ns. The platform utilizes the laser power at NIF for both the laser drive and the generation of 10 keV X-rays for ∼10 ns using a Ge backlighter foil. We aim to use FIDDLE to observe diffraction at different times during compression to probe the kinetics of phase changes. Pb undergoes two solid-solid phase transitions during ramp compression: from face centered cubic (FCC) to hexagonal close packed (HCP) and HCP to body centered cubic (BCC). Results will be reported on some of the first shots using the FIDDLE diagnostic at NIF on ramp compressed Pb to a peak pressure of ∼110 GPa and a single undriven CeO2 calibration shot. A discussion of the uncertainties in the observed diffraction is included.
期刊介绍:
Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.