May M J, Widmann K, Sorce C, Park H-S, Schneider M
Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
Rev Sci Instrum. 2010 Oct;81(10):10E505. doi: 10.1063/1.3475385.
The Dante is an 18 channel x-ray filtered diode array which records the spectrally and temporally resolved radiation flux from various targets (e.g., hohlraums, etc.) at x-ray energies between 50 eV and 10 keV. It is a main diagnostic installed on the OMEGA laser facility at the Laboratory for Laser Energetics, University of Rochester. The absolute flux is determined from the photometric calibration of the x-ray diodes, filters and mirrors, and an unfold algorithm. Understanding the errors on this absolute measurement is critical for understanding hohlraum energetic physics. We present a new method for quantifying the uncertainties on the determined flux using a Monte Carlo parameter variation technique. This technique combines the uncertainties in both the unfold algorithm and the error from the absolute calibration of each channel into a one sigma Gaussian error function. One thousand test voltage sets are created using these error functions and processed by the unfold algorithm to produce individual spectra and fluxes. Statistical methods are applied to the resultant set of fluxes to estimate error bars on the measurements.
“但丁”是一个18通道的X射线滤波二极管阵列，它能记录50电子伏特至10千电子伏特X射线能量范围内来自各种靶（如黑体腔等）的光谱和时间分辨辐射通量。它是安装在罗切斯特大学激光能量学实验室的OMEGA激光装置上的主要诊断设备。绝对通量由X射线二极管、滤光片和镜子的光度校准以及一种解卷积算法确定。了解这种绝对测量中的误差对于理解黑体腔能量物理至关重要。我们提出了一种使用蒙特卡罗参数变化技术量化所确定通量不确定性的新方法。该技术将解卷积算法中的不确定性和每个通道绝对校准的误差合并到一个单标准差高斯误差函数中。使用这些误差函数创建一千组测试电压集，并通过解卷积算法进行处理，以生成单独的光谱和通量。将统计方法应用于所得的通量集，以估计测量的误差范围。
