29 August 2017 Test plan for the PROBA3/ASPIICS scaled model measurement campaign
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Abstract
PROBA3/ASPIICS (Association of Spacecraft for Polarimetric and Imaging Investigation of the Corona of the Sun) is the first formation flight solar coronagraph, scheduled by ESA for a launch and currently in phase C/D. It is constituted by two spacecraft (one hosting the occulter, diameter 142 cm, and one with the telescope) separated by 144 m, kept in strict alignment by means of complex active and metrology custom systems. The stray light analysis, which is always one the most critical work packages for a solar coronagraph, has been only theoretically investigated so far due to the difficulty of replicating the actual size system in a clean laboratory environment. The light diffracted by the external occulter is the worst offender for the stray light level on the instrument focal plane, thus there is strong interest for scaling at least the occultation system of the coronagraph and test it in front of a solar simulator in order to experimentally validate the expected theoretical performance. The theory for scaling the occulter, the occulter-pupil distance and the source dimension has been developed and a scaled model is being manufactured. A test campaign is going to be conducted at the OPSys facility in Torino in front of a solar simulator (conveniently scaled). This work accounts for the description of the scaled model laboratory set-up and of the test plan.
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Federico Landini, Federico Landini, Cristian Baccani, Cristian Baccani, Sébastien Vives, Sébastien Vives, Silvano Fineschi, Silvano Fineschi, Marco Romoli, Marco Romoli, Gerardo Capobianco, Gerardo Capobianco, Giuseppe Massone, Giuseppe Massone, Marta Casti, Marta Casti, Alessandro Bemporad, Alessandro Bemporad, Mauro Focardi, Mauro Focardi, Maurizio Pancrazzi, Maurizio Pancrazzi, Davide Loreggia, Davide Loreggia, Vladimiro Noce, Vladimiro Noce, Alain Jody Corso, Alain Jody Corso, Cédric Thizy, Cédric Thizy, Etienne Renotte, Etienne Renotte, Benoît Marquet, Benoît Marquet, } "Test plan for the PROBA3/ASPIICS scaled model measurement campaign", Proc. SPIE 10397, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX, 103971C (29 August 2017); doi: 10.1117/12.2273921; https://doi.org/10.1117/12.2273921
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