LISA telescope assembly optical stability characterization for ESA

Adrianus L. Verlaan; Harmen Hogenhuis; Joep Pijnenburg; Martin Lemmen; Stefano Lucarelli; Dietmar Scheulen; David Ende

doi:10.1117/12.925112

13 September 2012 LISA telescope assembly optical stability characterization for ESA

Adrianus L. Verlaan, Harmen Hogenhuis, Joep Pijnenburg, Martin Lemmen, Stefano Lucarelli, Dietmar Scheulen, David Ende

Proceedings Volume 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II; 845003 (2012) https://doi.org/10.1117/12.925112
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The LISA Optical Stability Characterization project is part of the LISA CTP activities to achieve the required Technonlogy Readiness Level (TRL) for all of the LISA technologies used. This activity aims demonstration of the Telescope Assembly (TA), with a structure based on CFRP technology, that a CTE of 10^-7 1/K can be achieved with measures to tune the CTE to this level. In addition the demonstration is required to prove that the structure exhibits highly predictable mechanical distortion characteristics when cooling down to -90°C, during outgassing in space and when going from 1g environment to 0g. This paper describes the test facilities as well as the first test results. A dedicated test setup is designed and realized to allow monitoring dimensional variations of the TA using three interferometers, while varying the temperature in a thermal vacuum chamber. Critical parameters of the verification setup are the length metrology accuracy in thermal vacuum and the thermal vacuum flexibility and stability. The test programme includes Telescope Assembly CTE measurements and thermal gradient characterization.

Citation Download Citation

Adrianus L. Verlaan, Harmen Hogenhuis, Joep Pijnenburg, Martin Lemmen, Stefano Lucarelli, Dietmar Scheulen, and David Ende "LISA telescope assembly optical stability characterization for ESA", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 845003 (13 September 2012); https://doi.org/10.1117/12.925112

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