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Progress in the indirect slumping technology development at MPE for lightweight X-ray optics

机译：MPE的轻型X射线光学器件间接沉陷技术开发的进展

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Large X-ray telescopes for future observatories need to combine a big collecting area, meaning thin mirrors with large diameter, with good angular resolution. Structures have to be stiff enough to guarantee the correct profiles and positioning of such mirrors. Due to the mass limits of the launching rockets, lightweight materials and configurations are required.. The Slumped Glass Optic (SGO) group of the Max-Planck-Institute for Extraterrestrial physics (MPE) is developing the indirect slumping technology to comply with this need. This technique foresees the shaping at high temperature of thin glass foils, originally flat, to Wolter I design X-ray mirror segments, by using suitable moulds. During the thermal cycle inside an electrical oven the glass viscosity is such reduced that it allows its bending onto the mould. So the mould's shape is replicated while still maintaining the original micro-roughness of the glass on the non-contact side that is of fundamental importance for X-ray reflections. This replication process is particularly suitable for the manufacturing of several identical optical elements, which must successively be coated with the necessary reflective layer and then aligned and integrated into supporting structures. Numerous aspects of the technology have been studied in the past, such as the selection of mould and glass materials, and the corresponding optimization of the thermal cycle parameters. During the last year, we focused on different process set-ups. The current results and status of activities will be presented in the paper.
机译：面向将来的天文台的大型X射线望远镜需要结合较大的收集区域，这意味着直径较大且具有良好角分辨率的薄镜。结构必须足够坚硬，以保证此类反射镜的正确轮廓和位置。由于发射火箭的质量限制，需要轻质材料和配置。 。这项技术可以预见高温下薄玻璃箔的形状，该玻璃箔原先是平坦的，然后通过使用合适的模具，Wolter I设计了X射线镜段。在电烤箱内的热循环过程中，玻璃的粘度会降低，从而使其弯曲到模具上。因此，模具的形状得以复制，同时仍保持玻璃在非接触面的原始微观粗糙度，这对于X射线反射至关重要。该复制过程特别适合于制造多个相同的光学元件，这些光学元件必须先后用必要的反射层进行涂覆，然后对准并集成到支撑结构中。过去已经研究了该技术的许多方面，例如模具和玻璃材料的选择以及热循环参数的相应优化。去年，我们专注于不同的流程设置。本文将介绍活动的当前结果和状态。

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