论文标题
在超高强度激光照射下进行多层靶标的加热和密度振荡的影响
Heating in Multi-Layer Targets at ultra-high Intensity Laser Irradiation and the Impact of Density Oscillation
论文作者
论文摘要
我们介绍了在超高强度激光照射下多层靶标的等化加热的计算研究（约10 ** 20 w/cm ** 2）。先前的研究表明，界面处的离子加热增强，但以大温度梯度为代价。在这里，我们研究了多层目标，以将这种增强的界面加热扩散到整个目标，并找到温度分布比单个界面更均匀的加热参数，同时仍超过非层次目标的平均温度。此外，我们确定了一种压力振荡，该振荡使该层在扩展和被压缩的对加热的不利影响之间交替。基于此，我们得出了一个分析模型，该模型估计了振荡期，以找到优化加热和温度同质性的目标条件。该模型也可以用于推断可以从振荡周期开始的血浆温度，该温度可以测量，例如通过XFEL探测。
We present a computational study of isochoric heating in multi-layered targets at ultra-high intensity laser irradiation (approx. 10**20 W/cm**2). Previous studies have shown enhanced ion heating at interfaces, but at the cost of large temperature gradients. Here, we study multi-layered targets to spread this enhanced interface heating to the entirety of the target and find heating parameters at which the temperature distribution is more homogeneous than at a single interface while still exceeding the mean temperature of a non-layered target. Further, we identify a pressure oscillation that causes the layers to alternate between expanding and being compressed with non beneficial effect on the heating. Based on that, we derive an analytical model estimating the oscillation period to find target conditions that optimize heating and temperature homogeneity. This model can also be used to infer the plasma temperature from the oscillation period which can be measured e.g. by XFEL probing.
