Nash T J, Rochau G A, Bailey J E
Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
Rev Sci Instrum. 2010 Oct;81(10):10E518. doi: 10.1063/1.3483230.
We are attempting to measure the transmission of iron on Z at plasma temperatures and densities relevant to the solar radiation and convection zone boundary. The opacity data published by us to date has been taken at an electron density about a factor of 10 below the 9×10(22)/cm(3) electron density of this boundary. We present results of two-dimensional (2D) simulations of the heating and expansion of an opacity sample driven by the dynamic Hohlraum radiation source on Z. The aim of the simulations is to design foil samples that provide opacity data at increased density. The inputs or source terms for the simulations are spatially and temporally varying radiation temperatures with a Lambertian angular distribution. These temperature profiles were inferred on Z with on-axis time-resolved pinhole cameras, x-ray diodes, and bolometers. A typical sample is 0.3 μm of magnesium and 0.078 μm of iron sandwiched between 10 μm layers of plastic. The 2D LASNEX simulations indicate that to increase the density of the sample one should increase the thickness of the plastic backing.
我们正尝试在与太阳辐射和对流区边界相关的等离子体温度和密度条件下测量Z上铁的传输。我们迄今发布的不透明度数据是在比该边界9×10(22)/cm(3)电子密度低约10倍的电子密度下获取的。我们展示了由Z上的动态黑腔辐射源驱动的不透明度样品加热和膨胀的二维（2D）模拟结果。模拟的目的是设计能在更高密度下提供不透明度数据的箔片样品。模拟的输入或源项是具有朗伯角分布的随空间和时间变化的辐射温度。这些温度分布是通过Z上的轴上时间分辨针孔相机、X射线二极管和测辐射热计推断出来的。一个典型的样品是0.3μm厚的镁和夹在10μm厚塑料层之间的0.078μm厚的铁。二维LASNEX模拟表明，要提高样品的密度，应该增加塑料背衬的厚度。
