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Arcus is a concept for a probe class mission to deliver high-resolution FUVand X-ray spectroscopy. For X-rays, it combines cost-effective silicon poreoptics (SPO) with high-throughput critical-angle transmission (CAT) gratings toachieve $R> 3000$ in a bandpass from 12-50 Angstroem. We show in detail how theX-ray and the UV spectrographs (XRS and UVS) on Arcus will be aligned to eachother. For XRS we present ray-tracing studies to derive performancecharacteristics such as the spectral resolving power and effective area, studythe effect of misalignments on the performance, and conclude that mosttolerances can be achieved with mechanical means alone. We also present anestimate of the expected on-orbit background.

Arcus X-ray telescope performance and alignment