4MOST calibration system: design, assembly, and testing

Ioannis Politopoulos; Johan Pragt; Rik ter Horst; Ronald Roelfsema; Olga Bellido-Tirado; Joar Brynnel; Steffen Frey; Amina Helmi; Jeroen Herrewijnen; Roelof de Jong; Michael Lehmitz; Ramon Navarro; Allar Saviauk; Ray Sharples; Luke Tyas; Jurgen Schmoll; Walter Seifert; Menno de Haan; Menno Schuil; Eddy Elswijk; Eduardo Balbinot

doi:10.1117/12.2629542

29 August 2022 4MOST calibration system: design, assembly, and testing

Ioannis Politopoulos, Johan Pragt, Rik ter Horst, Ronald Roelfsema, Olga Bellido-Tirado, Joar Brynnel, Steffen Frey, Amina Helmi, Jeroen Herrewijnen, Roelof de Jong, Michael Lehmitz, Ramon Navarro, Allar Saviauk, Ray Sharples, Luke Tyas, Jurgen Schmoll, Walter Seifert, Menno de Haan, Menno Schuil, Eddy Elswijk, Eduardo Balbinot

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 1218473 (2022) https://doi.org/10.1117/12.2629542
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The Calibration Unit for 4MOST is providing hundreds of highly stable sharp spectral features with high power and mimicking the sky over the focal plane. The heart of the system is a combination of a bright broadband lamp and a Fabry-Perot etalon that provides a regular comb of spectral lines. 120 integrating spheres are distributed in 4 Light sabre linear arrays. These Light sabres are attached to the telescope spider struts and provide unvignetted illumination to the telescope focal plane. We describe the final design, the alignment, and the results of the testing.

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Ioannis Politopoulos, Johan Pragt, Rik ter Horst, Ronald Roelfsema, Olga Bellido-Tirado, Joar Brynnel, Steffen Frey, Amina Helmi, Jeroen Herrewijnen, Roelof de Jong, Michael Lehmitz, Ramon Navarro, Allar Saviauk, Ray Sharples, Luke Tyas, Jurgen Schmoll, Walter Seifert, Menno de Haan, Menno Schuil, Eddy Elswijk, and Eduardo Balbinot "4MOST calibration system: design, assembly, and testing", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 1218473 (29 August 2022); https://doi.org/10.1117/12.2629542

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