11 July 2016 The filter and calibration wheel for the ATHENA wide field imager
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The planned filter and calibration wheel for the Wide Field Imager (WFI) instrument on Athena is presented. With four selectable positions it provides the necessary functions, in particular an UV/VIS blocking filter for the WFI detectors and a calibration source. Challenges for the filter wheel design are the large volume and mass of the subsystem, the implementation of a robust mechanism and the protection of the ultra-thin filter with an area of 160 mm square. This paper describes performed trade-offs based on simulation results and describes the baseline design in detail. Reliable solutions are envisaged for the conceptual design of the filter and calibration wheel. Four different variant with different position of the filter are presented. Risk mitigation and the compliance to design requirements are demonstrated.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Rataj, M. Rataj, S. Polak, S. Polak, T. Palgan, T. Palgan, T. Kamisiński, T. Kamisiński, A. Pilch, A. Pilch, J. Eder, J. Eder, N. Meidinger, N. Meidinger, M. Plattner, M. Plattner, M. Barbera, M. Barbera, G. Parodi, G. Parodi, Fabio D'Anca, Fabio D'Anca, "The filter and calibration wheel for the ATHENA wide field imager", Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 990568 (11 July 2016); doi: 10.1117/12.2235411; https://doi.org/10.1117/12.2235411

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