Euclid. VII. Structural-thermal-optical performance

The performance of the Euclid system is defined in terms of image quality metrics tuned to the weak gravitational lensing cosmological probe. The weak lensing measurement induces stringent requirements on the shape and stability of the VIS instrument system . The is affected by error contributions from the telescope, the focal plane, and image motion, and it is controlled by a global error budget, with error allocations for each contributor. PSF PSF During development of the spacecraft, we verified through a structural-thermal-optical performance (STOP) analysis that the built and verified telescope with its spacecraft interface meets the in-orbit steady-state and transient image quality requirements under temperature-induced loads in all permitted spacecraft attitudes after all permitted attitude transitions. Based on data from its first year in orbit, we compared the performance we expected with the actual performance. For the purposes of the STOP analysis, we set up a detailed finite-element mathematical model and defined a standard set of test cases, both steady-state and transient, comprising combinations of worst-case boundary conditions. Iterations of the analysis were performed in conjunction with the major reviews of the spacecraft verification cycle. After launch, we applied the model in sensitivity analyses using realistic boundary conditions. The STOP analysis addressed the interaction of all spacecraft components in transmitting temperature-induced loads that lead to optical train deformation. The results of the prelaunch analysis demonstrated that temperature-induced optical perturbations would be well below the allowable limits for all permitted observing conditions. We used the STOP analysis predictions to help interpret the measured performance of the spacecraft as a function of environmental variables during its first year in orbit. We discovered unpredicted disturbances (heat pulses from instrument operation propagating into the telescope), and unexpected sensitivities (e.g. a high dependence of the telescope baseplate temperature on the solar aspect angle; a nearly absent dependence on the azimuth angle after the attitude domain was redefined for stray light avoidance). In-orbit temperature variations are small (<300,mK) and so are their effects on the telescope structure (displacements < 1 μm, rotations < 1 μrad), but they are detected in the time histories of the image quality metrics and are a non-negligible factor in the point spread function stability budget demanded by the weak lensing science (Δ e < 10^ -3 over 11,000,s). Taking everything into account, our analysis confirms the overall excellent performance of the telescope.

Authors

Publication Details

Journal
Springer Link (Chiba Institute of Technology)
Published
2026-03-20
DOI
https://doi.org/10.1051/0004-6361/202557524/pdf
Primary Topic
Spacecraft Design and Technology
Type
article
Field-Weighted Citation Impact
0.00
Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
article

Euclid. VII. Structural-thermal-optical performance

J-C Salvignol, S.-M. Niemi, E. Maiorano, H. Hildebrandt et al.
Springer Link (Chiba Institute of Technology)
Spacecraft Design and Technology
article

Euclid. VII. Structural-thermal-optical performance

J-C Salvignol, S.-M. Niemi, E. Maiorano, H. Hildebrandt, L. C. Smith, T. Vassallo, L. Valenziano, C. A. J. Duncan, M. Tenti, A. M. C. Le Brun, E. Branchini, D. Paoletti, A. Blanchard, F. Dubath, L. Gabarra, Z. Sakr, F. Courbin, S. Anselmi, M. Frailis, L. Legrand, D. Potter, S. Bardelli, N. Fourmanoit, A. Calabro, G. Verza, S. Cavuoti, L. Maurin, O. Marggraf, A. Cimatti, A. Veropalumbo, R. Farinelli, A. Díaz-Sánchez, Y. Fang, J. Lesgourgues, M. Fumana, S. Mei, S. Mottini, J. García-Bellido, R. C. Nichol, S. Serrano, E. Medinaceli, L. Miller, B. Gillis, W. J. Percival, H. Degaudenzi, K. Jahnke, S. J. Liu, S. Quai, S. Camera, D. Vergani, S. Bruton, E. A. Valentijn, J. Martín-Fleitas, T. I. Liaudat, C. Giocoli, A. R. Cooray, S. Andreon, G. Costa, J. Gracia-Carpio, R. B. Metcalf, A. Enia, K. George, A. Balestra, K. Kuijken, S. Ferriol, R. Toledo-Moreo, C. Rosset, H. Dole, S. Nadathur, S. Pires, A. Pisani, A. Mora, E. Zucca, Y. Wang, J. Kim, G. Gozaliasl, N. Martinet, M. Sahlén, I. Risso, C. M. Gutierrez, C. J. Conselice, G. Castignani, S. Davini, G. Morgante, J. Weller, G. Congedo, K. Tanidis, G. Seidel, M. Miluzio, G. Verdoes Kleijn, F. Torradeflot, F. Finelli, C. C. Kirkpatrick, M. Farina, A. Renzi, L. Moscardini, J. Valiviita, E. Romelli, V. Mareschi, B. Altieri, F. Cogato, D. Sciotti, F. Pasian, C. S. Carvalho, D. A. Sanders, L. Courcould Mifsud, R. J. Massey, S. V. H. Haugan, F. Raison, E. Sellentin, G. Meylan, C. J. A. P. Martins, M. Castellano, M. L. Brown, S. Matthew, H. I. Teplitz, M. Kunz, F. Giacomini, J. Rhodes, J. M. Diego, M. Meneghetti, B. Sartoris, M. Wiesmann, A. Troja, X. Dupac, S. Dusini, D. Tavagnacco, L. Leuzzi, F. Lepori, A. Loureiro, I. Tutusaus, M. Cropper, J. Steinwagner, C. Baccigalupi, G. D. Racca, V. Scottez, A. Hornstrup, G. Sirri, A. Cappi, J. Le Graet, A. Pezzotta, S. Escoffier, A. Secroun, M. Magliocchetti, R. Saglia, K. Pedersen, M. Gottero, C. Carbone, F. Marulli, G. Polenta, B. Kubik, F. Faustini, B. Camacho Quevedo, V. Pettorino, I. Lloro, C. Neissner, K. Naidoo, J. Hjorth, E. Keihänen, Y. Kang, M. Bethermin, K. Paterson, A. Hall, S. Kruk, P. Vielzeuf, A. Da Silva, D. Sapone, F. Mannucci, F. Caro, E. Merlin, D. Maino, S. Ligori, R. Cabanac, M. Radovich, Y. Copin, M. Schirmer, C. Colodro-Conde, R. Teyssier, M. Tucci, D. Stramaccioni, H. Kurki-Suonio, A. Finoguenov, S. Paltani, E. Rossetti, K. Kiiveri, M. Fabricius, H. M. Courtois, M. Lembo, C. Burigana, D. Bertacca, A. Montoro, S. Galeotta, A. Zacchei, O. Cucciati, L. Blot, F. Gianotti, L. A. Popa, J. Macias-Perez, M. Viel, A. Franco, V. Kansal, C. Moretti, J. Hoar, G. Leroy, R. Laureijs, S. Toft, P. Monaco, L. Patrizii, E. Sarpa, G. De Lucia, J. J. Diaz, V. Capobianco, G. Desprez, G. F. Lesci, S. Borgani, O. Mansutti, J. Skottfelt, T. Gasparetto, R. Kohley, F. Ducret, P. B. Lilje, G. Cañas-Herrera, D. Karagiannis, F. Passalacqua, P. SCHNEIDER, M. Guidi, G. Riccio, M. Poncet, E. Gaztañaga, J. Carretero, R. Maoli, S. Sacquegna, M. Martinelli, I. Tereno, N. Mauri, M. Bolzonella, W. Holmes, R. Nakajima, Y. Akrami, W. G. Hartley, M. Brescia, N. Tessore, F. Grupp, A. Venhola, G. Testera, M. Baldi, S. Di Domizio, M. Bonici, C. Valieri, R. Rebolo, M. Y. Elkhashab, A. G. Sánchez, E. Bozzo, A. G. Ferrari, S. Tosi, M. Sereno, C. Sirignano, I. T. Andika, A. Navarro-Alsina, J. J. E. Kajava, M. Ballardini, M. Jhabvala, Y. Mellier, A. Schneider, M. Roncarelli, A. Biviano, J. A. Escartin Vigo, A. Anselmi, M. Moresco, G. Zamorani, C. Padilla, S. Conseil, F. Atrio-Barandela, A. Grazian, E. Franceschi, K. Ganga, A. Amara, A. N. Taylor, J.-C. Cuillandre, T. Schrabback, R. Bender, H. Hoekstra, N. Auricchio, N. A. Walton, P. Tallada-Crespí, M. Pöntinen, M. Archidiacono, V. Lindholm, L. Stanco, T. Castro, G. Mainetti, L. Conversi, S. Kermiche, F. Hormuth, A. Kiessling, S. Nesseris
article en

Abstract

The performance of the Euclid system is defined in terms of image quality metrics tuned to the weak gravitational lensing cosmological probe. The weak lensing measurement induces stringent requirements on the shape and stability of the VIS instrument system . The is affected by error contributions from the telescope, the focal plane, and image motion, and it is controlled by a global error budget, with error allocations for each contributor. PSF PSF During development of the spacecraft, we verified through a structural-thermal-optical performance (STOP) analysis that the built and verified telescope with its spacecraft interface meets the in-orbit steady-state and transient image quality requirements under temperature-induced loads in all permitted spacecraft attitudes after all permitted attitude transitions. Based on data from its first year in orbit, we compared the performance we expected with the actual performance. For the purposes of the STOP analysis, we set up a detailed finite-element mathematical model and defined a standard set of test cases, both steady-state and transient, comprising combinations of worst-case boundary conditions. Iterations of the analysis were performed in conjunction with the major reviews of the spacecraft verification cycle. After launch, we applied the model in sensitivity analyses using realistic boundary conditions. The STOP analysis addressed the interaction of all spacecraft components in transmitting temperature-induced loads that lead to optical train deformation. The results of the prelaunch analysis demonstrated that temperature-induced optical perturbations would be well below the allowable limits for all permitted observing conditions. We used the STOP analysis predictions to help interpret the measured performance of the spacecraft as a function of environmental variables during its first year in orbit. We discovered unpredicted disturbances (heat pulses from instrument operation propagating into the telescope), and unexpected sensitivities (e.g. a high dependence of the telescope baseplate temperature on the solar aspect angle; a nearly absent dependence on the azimuth angle after the attitude domain was redefined for stray light avoidance). In-orbit temperature variations are small (<300,mK) and so are their effects on the telescope structure (displacements < 1 μm, rotations < 1 μrad), but they are detected in the time histories of the image quality metrics and are a non-negligible factor in the point spread function stability budget demanded by the weak lensing science (Δ e < 10^ -3 over 11,000,s). Taking everything into account, our analysis confirms the overall excellent performance of the telescope.

Springer Link (Chiba Institute of Technology)
Openalex Percentile: Top 11%
Spacecraft Design and Technology
DOISourceOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.