Optical simulations for design, alignment, and performance prediction of silicon pore optics for the ATHENA x-ray telescope
| Autor: | Spiga, D., Della Monica Ferreira, Desiree, Shortt, B., Bavdaz, M., Bergback Knudsen, E., Bergbäck Knudsen, Erik, Bianucci, G., Christensen, Finn Erland, Civitani, M., Collon, M., Conconi, P., Fransen, S., Marioni, F., Massahi, Sonny, Pareschi, G., Salmaso, B., Jegers, A. S., Tayabaly, K., Valsecchi, G., Westergaard, Niels Jørgen Stenfeldt, Wille, E. |
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| Přispěvatelé: | ITA, DNK, NLD, O'Dell, Stephen L., Pareschi, Giovanni |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Point spread function
Design Population X-ray telescope 01 natural sciences law.invention 010309 optics Telescope Optics law 0103 physical sciences Performance prediction Angular resolution education 010303 astronomy & astrophysics Alignment Physics education.field_of_study business.industry Silicon pore optics ATHENA Metrology business Focus (optics) Diffraction Simulation |
| Zdroj: | Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII Spiga, D, Della Monica Ferreira, D, Shortt, B, Bavdaz, M, Bergback Knudsen, E, Bergbäck Knudsen, E, Bianucci, G, Christensen, F E, Civitani, M, Collon, M, Conconi, P, Fransen, S, Marioni, F, Massahi, S, Pareschi, G, Salmaso, B, Jegers, A S, Tayabaly, K, Valsecchi, G, Westergaard, N J S & Wille, E 2017, Optical simulations for design, alignment, and performance prediction of silicon pore optics for the ATHENA x-ray telescope . in S L O'Dell & G Pareschi (eds), Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII . vol. 10399, 103990H, SPIE-International Society for Optical Engineering, Proceedings of SPIE-The International Society for Optical Engineering, SPIE Optics + Photonics 2017, San Diego, California, United States, 06/08/2017 . https://doi.org/10.1117/12.2274905 |
| Popis: | The ATHENA X-ray observatory is a large-class ESA approved mission, with launch scheduled in 2028. The technology of silicon pore optics (SPO) was selected as baseline to assemble ATHENA’s optic with hundreds of mirror modules, obtained by stacking wedged and ribbed silicon wafer plates onto silicon mandrels to form the Wolter-I configuration. In the current configuration, the optical assembly has a 3 m diameter and a 2 m2 effective area at 1 keV, with a required angular resolution of 5 arcsec. The angular resolution that can be achieved is chiefly the combination of 1) the focal spot size determined by the pore diffraction, 2) the focus degradation caused by surface and profile errors, 3) the aberrations introduced by the misalignments between primary and secondary segments, 4) imperfections in the co-focality of the mirror modules in the optical assembly. A detailed simulation of these aspects is required in order to assess the fabrication and alignment tolerances; moreover, the achievable effective area and angular resolution depend on the mirror module design. Therefore, guaranteeing these optical performances requires: a fast design tool to find the most performing solution in terms of mirror module geometry and population, and an accurate point spread function simulation from local metrology and positioning information. In this paper, we present the results of simulations in the framework of ESA-financed projects (SIMPOSiuM, ASPHEA, SPIRIT), in preparation of the ATHENA X-ray telescope, analyzing the mentioned points: 1) we deal with a detailed description of diffractive effects in an SPO mirror module, 2) we show ray-tracing results including surface and profile defects of the reflective surfaces, 3) we assess the effective area and angular resolution degradation caused by alignment errors between SPO mirror module’s segments, and 4) we simulate the effects of co-focality errors in X-rays and in the UV optical bench used to study the mirror module alignment and integration. |
| Databáze: | OpenAIRE |
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