Effect of electron irradiation on the radius of curvature of a Zerodur mirror

Dominic B. Doyle; J. Bourrieau; Pierre M. Bricard; Bengt Johlander; Hans Joachim Juranek; A. Litzelmann; Wolfgang Pannhorst; W. Rits

doi:10.1117/12.246782

19 August 1996 Effect of electron irradiation on the radius of curvature of a Zerodur mirror

Dominic B. Doyle, J. Bourrieau, Pierre M. Bricard, Bengt Johlander, Hans Joachim Juranek, A. Litzelmann, Wolfgang Pannhorst, W. Rits

Author Affiliations +

Proceedings Volume 2775, Specification, Production, and Testing of Optical Components and Systems; (1996) https://doi.org/10.1117/12.246782
Event: Optical Instrumentation and Systems Design, 1996, Glasgow, United Kingdom

Abstract

This paper describes the results of a study carried out to measure the actual deformation of a Zerodur telescope mirror due to electron irradiation simulating the dose expected on a satellite in geostationary orbit (GEO). The purpose of the work was to provide a sound experimental basis for the predicted performance of the Silex telescope on the ARTEMIS GEO satellite. Silex is one of the data-relay payloads onboard ARTEMIS, which is an experimental satellite developed for the European Space Agency to test and operate new telecommunications services. The Silex telescope is a 250 mm diameter Cassegrain afocal telescope with an F/1.5 primary mirror which has been specified to meet very stringent long term focusing stability requirements in order to ensure a transmitted wavefront radius of curvature of 30 km or better over the ten year lifetime of the experiment. Communication will primarily be conducted between the GEO terminal and an identical one to be flown on the French SPOT 4 satellite in low earth orbit. The results presented here show that it is not possible in general to predict the behavior of a relatively large and complex Zerodur mirror by applying the results form small samples. Previously published results show that Zerodur obeys a square root lay for compaction versus electron irradiation dose. We find that the change in radius of curvature of a 250 mm diameter Zerodur mirror has a linear dependency on the dose, and that the compaction behavior is not dependent on the dose rate, but is confirmed to vary as the square root of the dose.

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Dominic B. Doyle, J. Bourrieau, Pierre M. Bricard, Bengt Johlander, Hans Joachim Juranek, A. Litzelmann, Wolfgang Pannhorst, and W. Rits "Effect of electron irradiation on the radius of curvature of a Zerodur mirror", Proc. SPIE 2775, Specification, Production, and Testing of Optical Components and Systems, (19 August 1996); https://doi.org/10.1117/12.246782

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