X-ray pencil beam facility for optics characterization

被引：22

作者：

Krumrey, Michael ^{[1
]}

Cibik, Levent ^{[1
]}

Mueller, Peter ^{[1
]}

Bavdaz, Marcos ^{[2
]}

Wille, Eric ^{[2
]}

Ackermann, Marcelo ^{[3
]}

Collon, Maximilien J. ^{[3
]}

机构：

[1] PTB, Abbestr 2-12, D-10587 Berlin, Germany

[2] European Space Agcy, Estec, NL-2200 AG Noordwijk, Netherlands

[3] Cosine Res BV, NL-2333 CA Leiden, Netherlands

来源：

SPACE TELESCOPES AND INSTRUMENTATION 2010: ULTRAVIOLET TO GAMMA RAY | 2010年 / 7732卷

关键词：

synchrotron radiation; beamline; radiometry; calibration; silicon pore optics; X-ray optics; X-ray telescopes; CALIBRATION; PTB;

D O I：

10.1117/12.857335

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Physikalisch-Technische Bundesanstalt (PTB) has used synchrotron radiation for the characterization of optics and detectors for astrophysical X-ray telescopes for more than 20 years. At a dedicated beamline at BESSY II, a monochromatic pencil beam is used by ESA and cosine Research since the end of 2005 for the characterization of novel silicon pore optics, currently under development for the International X-ray Observatory (IXO). At this beamline, a photon energy of 2.8 keV is selected by a Si channel-cut monochromator. Two apertures at distances of 12.2 m and 30.5 m from the dipole source form a pencil beam with a typical diameter of 100 mu m and a divergence below 1". The optics to be investigated is placed in a vacuum chamber on a hexapod, the angular positioning is controlled by means of autocollimators to below 1". The reflected beam is registered at 5 m distance from the optics with a CCD-based camera system. This contribution presents design and performance of the upgrade of this beamline to cope with the updated design for IXO. The distance between optics and detector can now be 20 m. For double reflection from an X-ray Optical Unit (XOU) and incidence angles up to 1.4 degrees, this corresponds to a vertical translation of the camera by 2 m. To achieve high reflectance at this angle even with uncoated silicon, a lower photon energy of 1 keV is available from a pair of W/B4C multilayers. For coated optics, a high energy option can provide a pencil beam of 7.6 keV radiation.

引用

页数：8

共 6 条

[1] A quarter-century of metrology using synchrotron radiation by PTB in Berlin [J].