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The scientific payload of ROSAT consists of two imaging telescopes.

The main payload is the large X-ray telescope (XRT), the most powerful one ever built, designed for measurement of soft X-rays in the energy range of 0.1 keV - 2 keV, corresponding to wavwlengths of 100 Å - 6 Å.

The wide field camera (WFC), as the secondary payload, extends the measuring range to the extreme ultraviolet region with energies 0f 0.04 keV - 0.2 keV (300 Å - 60 Å).

[ZEISS - X-ray Mirror Integration]
X-ray Mirror Integration

The X-ray telescope consists of the following groups:

[XRT - Cross Section]
X-ray Telescope - Cross Section

Attached to the telescope front tube are the two star trackers and the gyro package, the most inportant attitude measurement units.

The wide field camera (WFC) uses three nested aluminium mirrors to focus the extreme ultraviolet (XUV) radiation on a microchannel plate (MCP) X-ray detector. A focal plane turret assembly is used to select one of two identical detector assemblies. Each MCP detector is mounted integrally with its high voltage power supply and pre-amplifiers.

A forward closure door is used to protect the mirror aperture and is opend for in-orbit operation.

A baffle assembly mounted in front of the mirrors excludes scattered solar radiation from the mirror aperture and provides thermal decoupling between mirrors and space.

Background electrons reflected by the mirrors into the telescope are deflected out of the detector aperture by a magnetic diverter system.

Attitude data is obtained from a star tracker unit, coaligned with the optical axis of the mirrors and mounted externally to the telescope, together with the star tracker electronics.

The power supply unit is also attached to the telescope outside.

A command and data handling electronics package is mounted to the telescope aft end and enclosed by hemispherical cover.

The external surfaces of the WFC are covered by multilayer thermal insulation.

ROSAT (Röntgensatellit)
Copyright © 1998 Max-Planck-Institut für extraterrestrische Physik, 85740 Garching, Germany.
The ROSAT project is run by the German Aerospace Center (DLR) (former DARA), Bonn, by order of the Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF). All rights reserved.