A Stacked Prism Lens Concept for Next-Generation Hard X-Ray Telescopes
A Stacked Prism Lens Concept for Next-Generation Hard X-Ray Telescopes WUJUN MI Doctoral Thesis Stockholm, Sweden 2019 KTH Fysik TRITA-SCI-FOU 2019:41 SE-106 91 Stockholm ISBN 978-91-7873-286-9 SWEDEN Akademisk avhandling som med tillstånd av Kungl Tekniska högskolan framlägges till offentlig granskning för avläggande av teknologie doktorsexamen i fysik fredagen den 27 september 2019 klockan 10.00 i E3, Osquars backe 14, Kungliga Tekniska Högskolan, Stockholm. © Wujun Mi, September 2019 Tryck: Universitetsservice US AB iii Abstract Over the past half century, the focusing X-ray telescope has played a very prominent role in X-ray astronomy at the frontier of fundamental physics. The finer angular resolution and increased effective area have enabled more and more exciting discoveries and detailed studies of the high-energy universe, including the cosmic X-ray background (CXB) radiation, black holes in active galactic nuclei (AGN), galaxy clusters, supernova remnants, and so on. At present, nearly all the state-of-the-art focusing X-ray telescopes are based on Wolter-I optics or its variations, for which the throughput is severely restricted by the mirror’s surface roughness, figure error, alignment error, and so on. Within the course of this work, we have developed a novel point-focusing refractive lens, the stacked prism lens (SPL), which is built by stacking disks embedded with various number of prismatic rings. As a Fresnel-like X-ray lens, it could provide a significantly higher efficiency and larger effective aper- ture than the conventional compound refractive lenses (CRLs). The aim of this thesis is to demonstrate the feasibility of the stacked prism lens and investigate the application to a next-generation hard X-ray telescope.
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