Chandrayaan-2, the second Indian mission to the Moon, carries a spectrometer called the Solar X-ray Monitor (XSM) to perform soft X-ray spectral measurements of the Sun while a companion payload measures the fluorescence emission from the Moon. Together these two payloads will provide quantitative estimates of elemental abundances on the lunar surface. XSM is also expected to provide significant contributions to the solar X-ray studies with its highest time cadence and energy resolution spectral measurements. For this purpose, the XSM employs a Silicon Drift Detector and carries out energy measurements of incident photons in the 1 -- 15 keV range with a resolution of less than 180 eV at 5.9 keV, over a wide range of solar X-ray intensities. Extensive ground calibration experiments have been carried out with the XSM using laboratory X-ray sources as well as X-ray beam-line facilities to determine the instrument response matrix parameters required for quantitative spectral analysis. This includes measurements of gain, spectral redistribution function, and effective area, under various observing conditions. The capability of the XSM to maintain its spectral performance at high incident flux as well as the dead-time and pile-up characteristics have also been investigated. The results of these ground calibration experiments of the XSM payload are presented in this article.

中文翻译：

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月船二号轨道器上太阳 X 射线监视器的地面校准

Chandrayaan-2 是印度第二次登月任务，它携带一个称为太阳 X 射线监测器 (XSM) 的光谱仪，用于对太阳进行软 X 射线光谱测量，而伴随的有效载荷则测量来自月球的荧光发射。这两个有效载荷将一起提供月球表面元素丰度的定量估计。XSM 还有望以其最高的时间节奏和能量分辨率光谱测量为太阳 X 射线研究做出重大贡献。为此，XSM 使用硅漂移探测器并在很宽的太阳 X 射线强度范围内对 1 - 15 keV 范围内的入射光子进行能量测量，分辨率小于 180 eV，5.9 keV。XSM 使用实验室 X 射线源和 X 射线束线设备进行了广泛的地面校准实验，以确定定量光谱分析所需的仪器响应矩阵参数。这包括在各种观测条件下对增益、光谱再分布函数和有效面积的测量。还研究了 XSM 在高入射通量下保持其光谱性能以及死区时间和堆积特性的能力。本文介绍了 XSM 有效载荷的这些地面校准实验的结果。和有效面积，在各种观测条件下。还研究了 XSM 在高入射通量下保持其光谱性能以及死区时间和堆积特性的能力。本文介绍了 XSM 有效载荷的这些地面校准实验的结果。和有效面积，在各种观测条件下。还研究了 XSM 在高入射通量下保持其光谱性能以及死区时间和堆积特性的能力。本文介绍了 XSM 有效载荷的这些地面校准实验的结果。