Saha Timo T, Zhang William
NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
Appl Opt. 2003 Aug 1;42(22):4599-605. doi: 10.1364/ao.42.004599.
We introduce a new type of x-ray telescope design, an equal-curvature telescope. We simply add a second-order axial sag to the base grazing-incidence cone-cone telescope. The radius of curvature of the sag terms is the same on the primary surface and on the secondary surface. The design is optimized such that the on-axis image spot at the focal plane is minimized. The on-axis rms spot diameter of two telescopes that we studied is less than 0.2 arc sec. The off-axis performance is comparable with that of equivalent Wolter type 1 telescopes.
我们介绍了一种新型的X射线望远镜设计，即等曲率望远镜。我们只是在基本掠入射圆锥-圆锥望远镜上增加了二阶轴向 sag。sag项在主表面和次表面的曲率半径相同。该设计经过优化，使得焦平面上的轴上像斑最小化。我们研究的两台望远镜的轴上均方根光斑直径小于0.2角秒。离轴性能与等效的沃尔特1型望远镜相当。
