Abstract: To achieve the demanding aims of XEUS, which involve the detection of sources as faint as 10$+$MIN@18$/ ergs cm$+$MIN@2$/s$+$MIN@1$/ a large x-ray mirror will need to be developed. This core scientific aim implies that the XEUS mirror needs to have an effective collection area at 1 keV of 30 m$+2$/ coupled to a spatial resolution on-axis of between 2 and 5 arcsec, so as to avoid source confusion at these very faint flux levels. Finally a field of view of at least 5 arcmin must be covered so as to ensure that a significantly large population of high redshift x-ray sources can be observed in a single pointing over the energy band from 0.05-30 keV. Clearly the key characteristics of XEUS is the large x-ray mirror aperture coupled to the high spatial resolution. The XEUS mirror aperture of 10 m diameter is divided into annuli with each annulus subdivided into sectors. The basic mirror unit therefore consist of a set of heavily stacked thin mirror plates each retaining the correct geometry. This unit is known as a mirror petal and constitutes a complete free-standing calibrated part of the overall XEUS mirror. !3
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机译：摘要：为了实现XEUS的苛刻目标，其中包括检测微弱的源，例如10 $ + $ MIN @ 18 $ / ergs cm $ + $ MIN @ 2 $ / s $ + $ MIN @ 1 $ /大x -射线镜将需要开发。这个核心的科学目的意味着，XEUS镜需要在1 keV处具有30 m $ + 2 $ /的有效收集区域，并在2到5 arcsec的轴向空间分辨率之间耦合，以避免在这些位置产生光源混淆通量水平非常微弱。最后，必须覆盖至少5 arcmin的视场，以确保可以在0.05-30 keV的能带上的单个指向中观察到大量的高红移X射线源。显然，XEUS的关键特征是大X射线镜孔径与高空间分辨率相结合。直径为10 m的XEUS镜孔被分为多个环，每个环又细分为多个扇区。因此，基本反射镜单元由一组高度堆叠的薄反射镜板组成，每个反射镜板均保持正确的几何形状。这个单元被称为镜瓣，并构成整个XEUS镜的完整的独立校准部分。 ！3
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