We develop a filtered absolute extreme ultraviolet (AXUV) diode array to measure the time evolution of the soft x-ray spectrum in the energy range of 1–10 keV. AXUV–HS5, the detector, has a fast rise time of 0.7 ns, a wide energy detection range, and high accessibility. We use Geant4 simulations to design an appropriate filter set for flat-and-sharp virtual channels (VCs), where a filter with no spectral edge removes large tails of the response curves. A Levenberg–Marquardt (LM) method, sensitive to the expected spectral function, is improved to reliably generate a continuous radiation spectrum, by utilizing spectral information from the least-squares (LS) method that reconstructs a discrete spectrum with low spectral resolution directly from the VCs. We test the filtered AXUV diode array on an X-pinch device with a peak current of 140 kA at Seoul National University; the array with ten channels is installed in a vacuum chamber. For a two-wire 40 μm stainless steel X-pinch, x-ray power, radiation temperature, and the reconstructed x-ray spectrum are obtained from the filtered AXUV diode array by the combined LS–LM method.

中文翻译：

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开发用于 1-10 keV 能量范围内 X 收缩软 X 射线光谱的滤波 AXUV 二极管阵列

我们开发了一种过滤的绝对极紫外 (AXUV) 二极管阵列，用于测量 1-10 keV 能量范围内软 X 射线光谱的时间演变。AXUV-HS5 检测器具有 0.7 ns 的快速上升时间、宽能量检测范围和高可达性。我们使用 Geant4 模拟为平坦而锐利的虚拟通道 (VC) 设计合适的滤波器组，其中没有光谱边缘的滤波器去除了响应曲线的大尾部。Levenberg-Marquardt (LM) 方法对预期的光谱函数敏感，通过利用来自最小二乘法 (LS) 方法的光谱信息，该方法可以直接重建具有低光谱分辨率的离散光谱，从而可靠地生成连续辐射光谱。 VC。我们在首尔国立大学的峰值电流为 140 kA 的 X-pinch 设备上测试了滤波后的 AXUV 二极管阵列；具有十个通道的阵列安装在真空室中。对于两线制 40μ m 不锈钢 X 收缩、X 射线功率、辐射温度和重建的 X 射线光谱是通过组合 LS-LM 方法从过滤后的 AXUV 二极管阵列获得的。