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Proceedings Paper

X-ray pencil beam facility for optics characterization
Author(s): Michael Krumrey; Levent Cibik; Peter Müller; Marcos Bavdaz; Eric Wille; Marcelo Ackermann; Maximilien J. Collon
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Paper Abstract

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 μm 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°, 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.

Paper Details

Date Published: 29 July 2010
PDF: 8 pages
Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77324O (29 July 2010); doi: 10.1117/12.857335
Show Author Affiliations
Michael Krumrey, Physikalisch-Technische Bundesanstalt (Germany)
Levent Cibik, Physikalisch-Technische Bundesanstalt (Germany)
Peter Müller, Physikalisch-Technische Bundesanstalt (Germany)
Marcos Bavdaz, European Space Research and Technology Ctr. (Netherlands)
Eric Wille, European Space Research and Technology Ctr. (Netherlands)
Marcelo Ackermann, cosine Research B.V. (Netherlands)
Maximilien J. Collon, cosine Research B.V. (Netherlands)


Published in SPIE Proceedings Vol. 7732:
Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Monique Arnaud; Stephen S. Murray; Tadayuki Takahashi, Editor(s)

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