ICF实验软X光能谱的基函数解谱法
Unfolding soft X-ray spectra in ICF experiments with base function method
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摘要: 惯性约束聚变实验中，14通道软X光能谱仪是测量软X射线能谱、等效积分温度和辐射能流时间过程的重要诊断设备。基函数法是还原能谱分布的一种常用方法。通过对双峰谱形的还原,对不同类型基函数的选择、基函数参数的设置和求解方法等影响解谱的因素进行了比较分析。根据大量算例的结果，使用优化后的基函数和求解方法对实际测量辐射谱进行了计算，并与透射光栅谱仪的测量结果进行了比较。结果显示,根据谱仪通道响应选择三次样条的节点，能够较好还原软X射线的能谱。Abstract: In inertial confinement fusion experiments, three 14-channel soft X-ray spectrometers are used to detect the soft-X-ray spectra and obtain the time history of radiation flux and equivalent temperature. Base function method is one of the unfolding methods. Different parameters of the base functions and different solution methods are compared for the capability to unfold a two-peak predefined spectrum. Based on the unfolding test, the optimized base function and solution method are used to unfold spectrum in our experiment and the results are compared with the measurement of transmission grating spectrometers. The computation and analysis show that iterative method using third-order spline as base function has a better recovery of the soft-X-ray spectrum than other base functions and solutio
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Key words:
- soft x-ray spectrometer /
- inertial confinement fusion /
- unfolding method /
- base function
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