Dr. Riccardo Bressan Profile

Dr. Riccardo Bressan

at EIE Srl

SPIE Involvement:

Author

Publications (10)

Proceedings Article | 29 August 2022 Paper

From giant telescopes design: a new method of modal thermal analysis for innovative telescopes and instrumentation

G. Marchiori, M. Tordi, F. Rampini, M. Spinola, R. Bressan, A. Colovini, M. Faccioni

Proceedings Volume 12182, 1218243 (2022) https://doi.org/10.1117/12.2630297

KEYWORDS: Finite element methods, Thermal modeling, Systems modeling, Cameras, Diffusion, Thermal analysis, Control systems, Matrices, Telescopes, Solid modeling

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Proceedings Article | 29 August 2022 Presentation

Vera C. Rubin Observatory. The final erection of the big and fast Rotating Enclosure

Gianpietro Marchiori, Simone De Lorenzi, Johana Martinez, Leonardo Ghedin, Tommaso Marchiori, Cristina Battistel, Cristiana Manfrin, Riccardo Bressan, Lorenzo Vio, Matteo Faccioni, Tiziano Niero, Victor Krabbendan, Jeff Barr, Doug Neill, Jacques Sebag, Eduardo Serrano, Hernan Herrera, Wouter van Reeven, German Schumacher, Oliver Wiecha, Chuck Gessner, Chuck Claver

Proceedings Volume 12182, 121821L (2022) https://doi.org/10.1117/12.2629174

KEYWORDS: Observatories, Telescopes, Manufacturing, Wind energy, Lead, Large Synoptic Survey Telescope, Design for manufacturability, Control systems, Cladding, Astronomy

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Proceedings Article | 13 December 2020 Presentation + Paper

The ELT early vibration assessment and for other Giant Telescopes

Gianpietro Marchiori, Riccardo Bressan, Alessandro Colovini, Mattia Scomparin

Proceedings Volume 11445, 114450X (2020) https://doi.org/10.1117/12.2563308

KEYWORDS: Telescopes, Optical instrument design, Vibration isolation, Fluctuations and noise, Mirrors

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Proceedings Article | 10 September 2019 Presentation + Paper

VERT-X: VERTical X-ray raster-scan facility for ATHENA calibration. The concept design.

A. Moretti, G. Pareschi, M. Uslenghi, M. Tordi, R. Bressan, G. Valsecchi, F. Zocchi, P. Attina, F. Amisano, G. Sironi, B. Salmaso, S. Basso, G. Tagliaferri, D. Spiga, N. La Palombara, M. Fiorini, F. Dury, F. Marioni, G. Parissenti, G. Parodi, E. Wille, P. Corradi, M. Bavdaz, I. Ferreira

Proceedings Volume 11119, 111190O (2019) https://doi.org/10.1117/12.2530713

KEYWORDS: Calibration, X-rays, Collimators, X-ray optics

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Proceedings Article | 12 July 2019 Open Access

A vertical facility based on raster scan configuration for the x-ray scientific calibrations of the ATHENA optics

G. Pareschi, A. Moretti, B. Salmaso, G. Sironi, G. Tagliaferri, M. Uslenghi, M. Fiorini, P. Attinà, R. Bressan, G. Marchiori, M. Tordi, F. Marioni, G. Valsecchi, F. Zocchi

Proceedings Volume 11180, 1118025 (2019) https://doi.org/10.1117/12.2535996

KEYWORDS: Mirrors, X-rays, Calibration, X-ray sources, X-ray optics, X-ray telescopes, Cameras, Sensors, Raster graphics, Point spread functions

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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 since 2004 as the baseline for making the X-ray Mirror Assembly. Up to 700 mirror modules to obtain a nested Wolter like optics. The maximum diameter of the shells will be 2.5 m while the focal length is 12 m. The requirements for on-axis angular resolution and effective area at 1 keV are 5 arcsec HEW and 1.4 m², while the field of view will be 40 arcmin in diameter (50 % vignetting). While in this moment there an on-going effort aiming at demonstrating the feasibility of a so large optics with so stringent scientific requirements, an important aspect to be considered regards the scientific calibrations of the X-ray optics. In this respect, the Point Spread Function and effective area have to be correctly measured and calibrated on-ground at different energies across the entire field of view, with a low vignetting. The approach considered so far foresees the use of a long (several hundreds of meters) facility to allow a full illumination with low divergence of the entire optics module (or at least of large sections of it). The implementation of similar configurations in a completely new facility to be realized in Europe (friendly called "super Panter") or the retrofitting existing facilities like the XRCF at NASA/MSFC are being considered. In both cases the costs and the programmatic risks related to the implementation of these huge facilities, with their special jigs for the alignment of the ATHENA optics, represent important aspects to be considered. Moreover, the horizontal position of the optics to be used in full illumination facilities would determine gravitational deformations, not easy to be removed with actuators or by modeling. In this talk we will discuss a completely different concept, based on the mount of the optics in vertical position and the use of a raster scan of the ATHENA optics with a small (a few cm² wide) highly collimated (1 arcsec or so) white beam X-ray. This system will allow us to operate a much compact system. The use of a vertical configuration will imply smaller gravitational deformations, that can be controlled with actuators able to compensate them. A proper camera system with a sufficient energy resolution will be able to grant a correct measurement of both PSF and effective area of the Mirror Assembly within the calibration requirements and in a reasonable integration time. Moreover, it may allow us also to perform end-to-end tests using the two flight focal plane instruments of ATHENA. The cost and risks for the implementation would be much lower than for the full illumination systems. The conceptual configuration and preliminary expected performance of the facility will be discussed.

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Proceedings Article | 10 July 2018 Presentation + Paper

ELT dome and telescope: a unique prototype in a highly seismic context

Gianpietro Marchiori, Francesco Rampini, Stefano Mian, Ludovico De Lotto, Guido Camata, Riccardo Bressan

Proceedings Volume 10706, 107060Z (2018) https://doi.org/10.1117/12.2314945

KEYWORDS: Telescopes, Prototyping, Mirrors, Domes, Optical instrument design, Large telescopes, Spherical lenses, Structural design, Earthquakes, Finite element methods

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The European Extremely Large Telescope (E-ELT), with its primary mirror diameter of 39 meters, will be the largest optical/near-infrared telescope in the world and will allow scientists to investigate important unsolved issues of the universe.

The dome and telescope (DMS) are designed to ensure high performance in one of the most seismic active areas in the world, Cerro Armazones in Chile.

The Dome diameter is 86 m and sits on the top of a stiff concrete pier, which has been designed with horizontal seismic devices to reduce the seismic accelerations on the structures. The isolation system consists of a combination of High Damping Rubber Bearings (HDRBs) and lubricated spherical bearings.

The Telescope structure has been designed to be adaptive, during operation it is extremely stiff with low damping to guarantee the pointing and tracking (fixed condition) and when subjected to strong earthquakes it is flexible with high damping (isolated condition) to reduce the accelerations on the mirrors and instruments.

To fulfill these requirements, a 3D adaptive seismic isolation system has been designed with unique features. The telescope natural frequencies and damping change suddenly when the telescope is subjected to a 1-year return period seismic event, which is the maximum threshold acceleration acceptable without isolation. In the isolated configuration, the telescope frequencies range between 0.3 Hz (isolation frequency) and 30 Hz (highest frequency of interest), while in the fixed configurations the frequencies range between 2.6 Hz and 30Hz.

The vertical and horizontal acceleration reduction is obtained with special devices designed for this type of applications.

This paper presents the design and shows the results of the sophisticated nonlinear time history analyses performed on the DMS. The large finite element models consist of about 75000 nodes and over 110000 elements and include nonlinear spring damper elements calibrated experimentally to model the vertical and horizontal behavior of the seismic devices.

Proceedings Article | 10 July 2018 Paper

ELT Telescope: control system dynamic simulations

Gianpietro Marchiori, Francesco Rampini, Simone De Lorenzi, Enrico Marcuzzi, Enrico Bragante, Riccardo Bressan

Proceedings Volume 10705, 107052E (2018) https://doi.org/10.1117/12.2314946

KEYWORDS: Space telescopes, Telescopes, Control systems, Computer programming, Device simulation, Systems modeling, Finite element methods, Servomechanisms, Optical instrument design, Modal analysis

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Proceedings Article | 10 July 2018 Presentation + Paper

ELT dome and telescope: performance analysis overview

Gianpietro Marchiori, Francesco Rampini, Stefano Mian, Leonardo Ghedin, Enrico Marcuzzi, Riccardo Bressan

Proceedings Volume 10705, 1070513 (2018) https://doi.org/10.1117/12.2314942

KEYWORDS: Telescopes, Domes, Finite element methods, Space telescopes, 3D modeling, Servomechanisms, Control systems, Mirrors, Error analysis, Computer programming

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