Dr. Andrew Caldwell Profile

Dr. Andrew Caldwell

at STFC Rutherford Appleton Lab

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Author

Publications (6)

Proceedings Article | 27 August 2022 Poster + Paper

Preliminary surface charging analysis of Ariel payload dielectrics in early transfer orbit and L2-relevant space environment

M. Focardi, M. Michelagnoli, V. Noce, M. Vela Nunez, P. Bolli, R. Nesti, A. Lorenzani, L. Carbonaro, C. Del Vecchio, G. Falcini, A. Tozzi, A, Di Giorgio, E. Galli, M. Farina, G. Giusi, S. Liu, M. Venter, E. Tommasi, F. De Persio, M. Salatti, D. Brienza, R. Piazzolla, G. Morgante, N. Auricchio, E. Pascale, L. Naponiello, G. Redigonda, E. Pace, G. Preti, G. Micela, G. Malaguti, P. Eccleston, A. Caldwell, G. Bishop, L. Desjonqueres, G. Tinetti

Proceedings Volume 12180, 1218047 (2022) https://doi.org/10.1117/12.2628170

KEYWORDS: Space operations, Plasma, Dielectrics, Electrons, Solar processes, Ions, Particles, Satellites, Spectroscopy, Information technology

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Proceedings Article | 27 August 2022 Poster + Paper

Ground calibration of the Ariel space telescope: optical ground support equipment design and description

Neil Bowles, Manuel Abreu, Tim van Kempen, Matthijs Krijger, Robert Spry, Rory Evans, Robert Watkins, Cédric Pereira, E. Pascale, Paul Eccleston, Chris Pearson, Lucile Desjonquères, Georgia Bishop, Andrew Caldwell, Andrea Moneti, Mauro Focardi, Subhajit Sarkar, Giuseppe Malaguti, Ioannis Argyriou, Keith Nowicki, Alexandre Cabral, Giovanna Tinetti

Proceedings Volume 12180, 1218049 (2022) https://doi.org/10.1117/12.2627049

KEYWORDS: Calibration, Sensors, Mirrors, Projection systems, Cryogenics, Telescopes, Beam expanders, Spectroscopy, Monochromators, Signal detection

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This paper describes the Optical Ground Support Equipment (OGSE) that is being developed for the payload level testing of the Ariel Space Telescope. Ariel has been adopted as ESA’s “M4” mission in its Cosmic Visions Programme and will launch in 2029 to the second Earth-Sun Lagrange point. During four years of operation the Ariel payload (PL – the cryogenic payload module plus warm units) will perform precise transit spectroscopy of approximately 1000 known exoplanetary atmospheres using a 1.1 m × 0.7 m telescope coupled to two instruments: the Fine Guidance Sensor (FGS) and the Ariel Infrared Spectrometer (AIRS). These instruments provide three spectrometric channels that cover 1.0 to 7.8 μm wavelength range and three photometric channels between 0.5 and 1.1 μm. The Ariel OGSE will verify the optical and radiometric performance of the integrated Ariel PL under vacuum and cryogenic (<40 K) test conditions within the limitations of operation under Earth’s gravity and vibration environments. To achieve these verification requirements the OGSE is integrated with the main Ariel ground test 5 m thermal vacuum chamber. The test chamber contains a cryogenic enclosure (the Cryogenic Test Rig) that surrounds the PL and the OGSE itself comprises of four subsystems. (1) A cryogenic vacuum chamber and integrating sphere illumination module that is fed by visible, near infrared and thermal infrared sources. The illumination module is mounted external to the Ariel test chamber and coupled via a vacuum feedthrough that relays a 22 mm diameter test beam into the Cryogenic Test Rig. The test beam is then relayed using (2) an injection module that steers the beam to maintain alignment during cool-down and scan the Ariel telescope field of view. The beam is then expanded to partially illuminate the Ariel telescope primary mirror using an (3) ~0.3 m diameter target projector collimating mirror. The final optical component of the OGSE is a (4) beam expander placed on the Ariel common optical bench to compensate for the sub-aperture illumination of the primary and to ensure that the spectrometer modules provide illumination with correct cone angles during ground testing. It is planned to use the OGSE in 2026 for a full range of calibration and verification tests of the end-to-end telescope and instrument performance, including detectors, field of view and alignment. These tests will then ensure that Ariel meets it challenging photometric and spectral performance requirements.

Proceedings Article | 27 August 2022 Poster + Paper

Preliminary analysis of ground-to-flight mechanical tolerances of the Ariel mission telescope

Paolo Chioetto, Andrea Tozzi, Anna Brucalassi, Debora Ferruzzi, Andrew Caldwell, Martin Caldwell, Fausto Cortecchia, Emiliano Diolaiti, Paul Eccleston, Elisa Guerriero, Matteo Lombini, Giuseppe Malaguti, Giuseppina Micela, Emanuele Pace, Enzo Pascale, Raffaele Piazzolla, Giampaolo Preti, Mario Salatti, Giovanna Tinetti, Elisabetta Tommasi, Paola Zuppella

Proceedings Volume 12180, 121804R (2022) https://doi.org/10.1117/12.2628900

KEYWORDS: Telescopes, Monte Carlo methods, Mirrors, Tolerancing, Point spread functions, Device simulation, Statistical analysis, Optimization (mathematics), Telescope design, Thermography

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Proceedings Article | 27 August 2022 Presentation + Paper

AIRS: ARIEL IR spectrometer status

Jérôme Martignac, Jérôme Amiaux, Michel Berthé, Christophe Cara, Cyrille Delisles, Achrène Direk, Luc Dumaye, Jean Fontignie, Alain Goestschy, Benoît Horeau, Norma Hurtado, Duc-Dat Huyn, Grégory Kaszubiak, Pierre-Olivier Lagage, Isabelle Le Mer, Michel Lortholary, Vincent Moreau, Salima Mouzali, Patrick Mulet, François Nico, Thibault Pichon, Lena Provost, Diana Renaud, Victor Schwartz, Michel Talvard, Thierry Tourrette, François Visticot, Axel Arhancet, Damien Bachet, Nicolas Berton, Mickael Lacroix, Hervé Le Provost, Olivier Tellier, Anne Philippon, Clémence De Jabrun, Jean-Pierre Dubois, François Langlet, Dylan Le Claire, Benoît Lecomte, Marc Ollivier, Stéphane Tosti, Vincent Lapeyrère, Marion Bonafous, Jérôme Parisot, Jean-Michel Reess, Didier Zegadanin, Jean-Philipe Beaulieu, Virginie Batista, Pierre Drossart, Salma Fahmy, Delphine Jollet, Ludovic Puig, Thierry Tirolien, Pascale Danto, Gilles Hervet, Oceane Maisonnave, Paul Eccleston, Georgia Bishop, Rachel Drumond, Andrew Caldwell, Martin Caldwell, Lucile Desjonqueres, Martin Whalley, Enzo Pascale, Gianluca Morgante, Mauro Focardi, Emanuele Pace, Anna Maria Di Giorgio

Proceedings Volume 12180, 1218012 (2022) https://doi.org/10.1117/12.2628920

KEYWORDS: Sensors, Prisms, Spectroscopy, Telescopes, Interfaces, Control systems, Optical benches, Electronics, Infrared spectroscopy

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Proceedings Article | 13 December 2020 Paper

The role of the instrument control unit within the ARIEL Payload and its current design

Luca Naponiello, Vladimiro Noce, Mauro Focardi, Anna Maria Di Giorgio, Giampaolo Preti, Andrea Lorenzani, Andrea Tozzi, Ciro Del Vecchio, Maria Farina, Emanuele Galli, Gianluca Morgante, Antonio Scippa, Gabriele Redigonda, Giovanni Giusi, Jerome Amiaux, Christophe Cara, Michel Berthe, Roland Ottensamer, Paul Eccleston, Andrew Caldwell, Georgia Bishop, Lucile Desjonqueres, Rachel Drummond, Daniele Brienza, Emanuele Pace

Proceedings Volume 11443, 114434P (2020) https://doi.org/10.1117/12.2560504

KEYWORDS: Infrared spectroscopy, Spectroscopic atmospheric monitoring techniques, Infrared radiation, Exoplanets, Remote sensing, Spectroscopes, Control systems, Electronics, Spectroscopy, Space operations

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Proceedings Article | 13 December 2020 Presentation

The ARIEL payload: A technical overview

Paul Eccleston, Rachel Drummond, Kevin Middleton, Georgia Bishop, Andrew Caldwell, Lucile Desjonqueres, Ian Tosh, Nick Cann, Martin Crook, Matthew Hills, Chris Pearson, Caroline Simpson, Richard Stamper, Giovanna Tinetti, Enzo Pascale, Mark Swain, Warren Holmes, Andre Wong, Ludovic Puig, Göran Pilbratt, Martin Linder, Nathalie Boudin, Hanno Ertel, Lisa Gambicorti, Jean-Philippe Halain, Emanuele Pace, Francesc Vilardell, José Gómez, Josep Colomé, Jérôme Amiaux, Christophe Cara, Michel Berthe, Vincent Moreau, Gianluca Morgante, Giuseppe Malaguti, Gustavo Alonso, Javier Álvarez, Marc Ollivier, Anne Philippon, Marie-Laure Hellin, Steve Roose, Martin Frericks, Matthijs Krijger, Miroslaw Rataj, Piotr Wawer, Konrad Skup, Mateusz Sobiecki, Niels Christian Jessen, Søren Møller Pedersen, Peter Hargrave, Matt Griffin, Roland Ottensamer, Thomas Hunt, Duncan Rust, Aymen Saleh, Berend Winter, Mauro Focardi, Vania Da Deppo, Paola Zuppella, Markus Czupalla

Proceedings Volume 11443, 114430Z (2020) https://doi.org/10.1117/12.2561478

KEYWORDS: Space operations, Exoplanets, Spectroscopy, Spectrometers, Infrared radiation, Telescopes, Photometry, Infrared telescopes, Remote sensing, Spectroscopic atmospheric monitoring techniques

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