The Arcus X-ray spectrograph (XRS) will deliver high-resolution spectra in four telescope/grating modules (called “channels”) imaged onto the same set of detectors. We examine two effects (cross-dispersion from support structures in the diffraction gratings and frame transfer) that can lead to a photon being assigned to a different channel in the data reduction. Even within a channel, photons can be assigned the wrong diffraction order because orders are closely spaced in energy. Based on simulations, we show that cross-dispersion and frame transfer effects contribute <1% to the extracted signal and that order sorting is efficient enough that only very bright emission lines in a contaminating order can cause a visible signal. Finally, we describe a process to construct per-order non-X-ray background spectra for XRS simulations.

中文翻译：

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Arcus 的顺序排序和后台处理


Arcus X 射线光谱仪 （XRS） 将在四个望远镜/光栅模块（称为“通道”）中提供高分辨率光谱，这些光谱成像到同一组探测器上。我们研究了两种效应（衍射光栅中支撑结构的交叉色散和帧转移），这可能导致光子在数据缩减中被分配到不同的通道。即使在通道内，光子也可能被分配错误的衍射级数，因为级数的能量间距很近。基于仿真，我们表明交叉色散和帧传输效应对提取的信号贡献了 <1%，并且阶次排序足够有效，只有污染阶次的非常亮的发射线才能产生可见信号。最后，我们描述了为 XRS 模拟构建每阶非 X 射线背景光谱的过程。