Resolve onboard the x-ray satellite X-Ray Imaging and Spectroscopy Mission (XRISM) is a cryogenic instrument with an x-ray microcalorimeter in a Dewar. A lid partially transparent to x-rays (called gate valve or GV) is installed at the top of the Dewar along the optical axis. Because observations will be made through the GV for the first few months, the x-ray transmission calibration of the GV is crucial for initial scientific outcomes. We present the results of our ground calibration campaign of the GV, which is composed of a Be window and a stainless steel mesh. For the stainless steel mesh, we measured its transmission using the x-ray beamline at ISAS. For the Be window, we used synchrotron facilities to measure the transmission and modeled the data with (i) photoelectric absorption and incoherent scattering of Be, (ii) photoelectric absorption of contaminants, and (iii) coherent scattering of Be changing at specific energies. We discuss the physical interpretation of the transmission discontinuity caused by the Bragg diffraction in polycrystal Be, which we incorporated into our transmission phenomenological model. We present the x-ray diffraction measurement on the sample to support our interpretation. The measurements and the constructed model meet the calibration requirements of the GV. We also performed a spectral fitting of the Crab nebula observed with Hitomi SXS and confirmed improvements of the model parameters.

中文翻译：

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X射线天文学卫星XRISM的闸阀的X射线透射校准

解决X射线卫星上的问题X射线成像和光谱任务（XRISM）是一种低温仪器，在杜瓦瓶中装有X射线微热量计。杜瓦瓶顶部沿光轴安装有对X射线部分透明的盖子（称为闸阀或GV）。由于前几个月将通过GV进行观察，因此GV的X射线透射校准对于初步的科学成果至关重要。我们介绍了GV地面校准活动的结果，该活动由Be窗口和不锈钢网组成。对于不锈钢网，我们使用ISAS的X射线束线测量了其透射率。对于Be窗口，我们使用同步加速器工具来测量透射率，并通过（i）Be的光电吸收和非相干散射对数据进行建模，（ii）污染物的光电吸收，和（iii）Be在特定能量下的相干散射变化。我们讨论了由多晶Be中的布拉格衍射引起的传输不连续性的物理解释，并将其纳入了我们的传输现象学模型。我们介绍了样品的X射线衍射测量结果，以支持我们的解释。测量值和构建的模型符合GV的校准要求。我们还对使用Hitomi SXS观测到的蟹状星云进行了光谱拟合，并确认了模型参数的改进。我们将其纳入了传输现象学模型。我们介绍了样品的X射线衍射测量结果，以支持我们的解释。测量值和构建的模型符合GV的校准要求。我们还对使用Hitomi SXS观测到的蟹状星云进行了光谱拟合，并确认了模型参数的改进。我们将其纳入了传输现象学模型。我们介绍了样品的X射线衍射测量结果，以支持我们的解释。测量值和构建的模型符合GV的校准要求。我们还对使用Hitomi SXS观测到的蟹状星云进行了光谱拟合，并确认了模型参数的改进。