The SPEED facility is used in an educational context during teaching lectures given in Licence (L3 - UCA) and Master (M1/M2 Astrophysics MAUCA and MASS) degrees.
In the Physics license degree
SPEED is part of three elective and supervised projects given in the second semester of the 3rd year on coronagraphy, cophasing optics and the JWST.
 Coronagraphy: diffractive optics for exoplanets detection
 Cophasing optics: active optics for astronomical observations
 WebbPSF[edu]: understand JWST's images and development of the WebbPSF[edu] tool
In the Astrophysics master's degree
SPEED is part of instrumental courses given in various METEORs (Modules Experiments ThEOry Research) of the MAUCA master's degree (http://mauca.unice.fr/) and in two instrumental lectures in the MASS master's degree (https://www.master-mass.eu/).
 CSO: Cophasing Segmented Optics (elective lecture - M1/M2 MAUCA)
 SEFA: Software Engineering for Astronomy (elective lecture - M1/M2 MAUCA)
 IE: Imaging Exoplanets (elective lecture - M1/M2 MAUCA)
 Telescope Optics - Erasmus Master MASS (Master in Astrophysics and Space Science, compulsory course)
 Cophasing Optics - Erasmus Master MASS (Master in Astrophysics and Space Science, compulsory course)
Summary of courses currently proposed:
|Lecture||University year in which the lecture was provided|
|Supervised project on coronagraphy ||2018-2019 / 2019-2020 / 2020-2021|
|Supervised project on cophasing |
|Supervised project on WebbPSF[edu] ||2022-2023|
|Cophasing Segmented Optics ||2018-2019 / 2019-2020 / 2021-2022 / 2023-2024|
|Software Engineering for Astronomy ||2023-2024|
|Imaging Exoplanets |
|Telescope Optics ||2022-2023 / 2023-2024|
|Cophasing Optics ||2022-2023 / 2023-2024|
As of July 1st 2023, the SPEED project is a 731 k€ project (hardware). Funding came from various sources as described below. The project also received funding support from CNES, Airbus Defense & Space, Thales Alenia Space, Région PACA, OCA, and EDSFA for PhD contracts, and from the Lagrange laboratory for IUT and Master's degrees internships.
|Fresnel/Talbot effect, instrumental contrast design||LESIA, France|
|Self-coherent camera phasing sensor (SCC-PS, cophasing)||LESIA, France|
|ZELDA-PS (cophasing)||LAM, France|
|PIAACMC design study||NAOJ, USA|
|P. Martinez||Scientific manager (PI)|
|C. Gouvret||Optical study and AIT manager|
|J. Dejonghe||Opto-mechanical study|
|M. Beaulieu||System study and end-to-end modelling|
|A. Spang||Opto-mechanical engineering and AIV|
|C. Sallard||PhD student 2024-2027 (Thales Alenia Space /Région PACA)|
|R. Dharmadhikari||PhD senior fellow at the Indian Institut of Astrophysics (collaboration September - December 2023)|
|I. Lapassat||Administrative manager|
|G. Doyen||PhD student 2019-2022 (CNES/UCA), PhD withdrew in June 2022|
|O. Preis||Project manager|
|L. Abe||High-contrast simulation and validation expertise|
|K. Barjot||Internship M2|
|M. Postnikova||Internship M2|
|PhD student 2017-2020 (CNES/OCA), PhD withdrew in September 2018|
|P. Janin-Potiron||Internship M2|
|PhD student 2014-2017 (Airbus Defense & Space/Région PACA), awarded PhD SF2A 2018|
|Y. Fantei||Software consultant|
|J-B. Daban||Project manager|
|L. David||Internship IUT|
|P. Belzanne||Internship IUT|
|A. Chambinaud||Internship IUT|
|H. Philippon||Internship IUT|
Publication list with hyperlink
As of 2023 December 1st, the project gathers:
18 conference publications and 10 refereed publications, and 2 defended PhD theses.
Project overview publications
Martinez et al. ESO Messenger 2023 n°190
Martinez et al. Proceeding of the SPIE 2022
Martinez et al. Proceeding of the SPIE 2020
Martinez et al. Proceeding of the SPIE 2018
Martinez et al. Proceeding of the SPIE 2016
Martinez et al. Proceeding of the SPIE 2014
Martinez et al. ESO Messenger 2015 n°159
Key hardware studies publications
Martinez et al. A&A 2023 (sous press)
Martinez et al. A&A 2023 (sous press)
Doyen et al. Proceeding of the SPIE 2020
Barjot et al. Proceeding of the SPIE 2020
Beaulieu et al. MNRAS 2020, 498
Martinez et al. A&A 2020, Vol. 635, A126
Martinez, A&A Letter 2019, 629, L10
Beaulieu et al. Proceeding of the SPIE 2018
Martinez et al. Proceeding of the SPIE 2018
Janin-Potiron et al. A&A 2017
Beaulieu et al. MNRAS 2017, 469
Janin-Potiron et al. A&A 2016, 592, A110
Janin-Potiron et al. Proceeding of the SPIE 2016
Beaulieu et al. Proceeding of the SPIE 2016
Janin-Potiron et al. EAS publications series 78-79 2016
Preis et al. Proceeding of the AO4ELT 4th Edition 2015
Beaulieu et al. Proceeding of the AO4ELT 4th Edition 2015
Janin-Potiron et al. Proceeding of the AO4ELT 4th Edition 2015
Project related publications
Janin-Potiron, Martinez and Carbillet, OSA Continuum 2018 - 1(2), 715-726
Martinez and Janin-Potiron, A&A Letter 2016, 593, L1
Janin-Potiron Pierre, Université Côte d’Azur 2017 (Prix SF2A 2018)
Beaulieu Mathilde, Université Côte d’Azur 2017
Experimental results obtained on the SPEED testbed
The architectural principle of the SPEED bench is presented in the above diagram. The field of view of interest is restricted to 8 λ/D in radius given the aimed objective of high contrast at small angular separations. The bench is therefore composed of a visible cophasing optical path (in blue) and a near-infrared path (in red) dedicated to high contrast.
The common path is in orange colour in the 3D CAO view of the bench presented above. The visible path dedicated to the optical cophasing corresponds to the blue lines and the near-infrared path, dedicated to high-contrast imaging, corresponds to the red lines.
The Speed bench is installed in a clean-room environment (ISO7 classroom) at the Lagrange Laboratory, FIZEAU building on the Valrose campus in the city centre of Nice.
The SPEED project is an instrumental facility to study high-contrast imaging techniques with a segmented telescope that struggled to very close angular separations in view of the next generation of ground- and space-based observatories. The bench combines a segmented telescope simulator with 163 segments, co-phasing optics (in the optical domain), and multi-DM architecture combined with deep coronagraphic imaging (in the near-infrared). The scientific field of view is from 1 to 8 λ/D in the H-band. In terms of key hardware, the bench combines a super-continuum NKT light source, an integral sphere, a tip/tilt mirror, an IRIS AO PTT489 segmented deformable mirror, 2 Kilo-C deformable mirrors from Boston Micromachines, an SCC-PS and/or ZELDA-PS (cophasing sensors), a PIAACMC (coronagraph), and an SCC. The bench is currently under the AIT phase in an ISO 7 room in the FIZEAU building. The SPEED project benefits from wide local, national, and European support (see at the bottom of the page).
In particular, the SPEED testbed searches for participating in the future instrumental development of an exoplanet hunter around late-type stars (M-stars).
Three main research axes are studied:
The testbed will also offer the possibility to study ELT's inherent drawbacks from its segmented nature and emphasize the study of their impact on high-contrast (e.g., missing segment, cophasing residual, mixing XAO residuals and cophasing residuals, etc.)
All the SPEED OAPs have been realized by the OCA optical workshop.
Crédit: J. Dejonghe - C. Gouvret
3D CAO view of the SPEED test-bed placed on a 1.5 x 2.4 m table with protection panels forming a nearly closed box. Color code: telescope simulator and common path (orange), visible path (blue) and near-infrared path (red). Acronyms: TTM - tip/tilt mirror, OAP - off-axis parabola, ASM - active segmented mirror, DM - deformable mirror, FM - flat mirror, DIC - dichroic, L - lens, SCC-PS - self- coherent camera-phasing sensor, FPM - focal plan (mask), PIAA-M1 & PIAA-M2 - phase induced amplitude apodization mirror 1 & 2, LS - Lyot stop, APOGEE - visible camera, NIT - near-infrared camera, Basler - pupil camera (Vis. and NiR), FF - flip flop mirror, FW - filter wheel.
Simulated pupil of the SPEED telescope simulator exhibiting 30% central obscuration, 6 spiders and 163 segments.
Simulated NiR PSF image. The Blue circle defines the wavefront shaping DMs cut-off frequency. The red circle defines the field of view (FoV) targetted by the project and is restricted to small angular separations. Green circles localized the first diffractive signatures from the primary mirror segmentation.
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Tél. : +33 (0)4 92 00 30 11
Fax : +33 (0)4 92 00 30 33