Dr. Bruce Sibthorpe Profile

Dr. Bruce Sibthorpe

at SRON

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Publications (3)

Proceedings Article | 17 November 2017 Open Access

Safari: instrument design of the far-infrared imaging spectrometer for spica

W. Jellema, C. Pastor, D. Naylor, B. Jackson, B. Sibthorpe, P. Roelfsema

Proceedings Volume 10563, 105631K (2017) https://doi.org/10.1117/12.2304105

KEYWORDS: Sensors, Fourier transforms, Space telescopes, Telescopes, Spectroscopy, Mirrors, Magnetism, Astronomical imaging, Staring arrays, Interferometers

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The next great leap forward in space-based far-infrared astronomy will be made by the Japanese-led SPICA mission, which is anticipated to be launched late 2020’s as the next large astrophysics mission of JAXA, in partnership with ESA and with key European contributions. Filling in the gap between JWST and ALMA, the SPICA mission will study the evolution of galaxies, stars and planetary systems. SPICA will utilize a deeply cooled 3m-class telescope, provided by European industry, to realize zodiacal background limited performance, high spatial resolution and large collecting area.

Making full advantage of the deeply cooled telescope (<6K), the SAFARI instrument on SPICA is a highly sensitive wide-field imaging photometer and spectrometer operating in the 34-210 μm wavelength range. Utilizing Nyquist-sampled focal-plane arrays of very sensitive Transition Edge Sensors (TES), SAFARI will offer a photometric imaging (R ≈ 2), and a low (R = 100) and medium resolution (R = 2000 at 100 μm) imaging spectroscopy mode in three photometric bands within a 2’x2’ instantaneous FoV by means of a cryogenic Mach-Zehnder Fourier Transform Spectrometer.

In this paper we will provide an overview of the SAFARI instrument design and system architecture. We will describe the reference design of the SAFARI focal- plane unit, the implementation of the various optical instrument functions designed around the central large-stroke FTS system, the photometric band definition and out-of-band filtering by quasioptical elements, the control of straylight, diffraction and thermal emission in the long-wavelength limit, and how we interface to the large-format FPA arrays at one end and the SPICA telescope assembly at the other end.

We will briefly discuss the key performance drivers with special emphasis on the optical techniques adopted to overcome issues related to very low background operation of SAFARI. A summary and discussion of the expected instrument performance and an overview of the astronomical capabilities finally conclude the paper.

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Proceedings Article | 5 August 2014 Paper

Relative performance of dispersive and non-dispersive far-infrared spectrometer instrument architectures

Bruce Sibthorpe, Willem Jellema

Proceedings Volume 9150, 91500J (2014) https://doi.org/10.1117/12.2056524

KEYWORDS: Fourier transforms, Sensors, Spectroscopy, Astronomy, Telescopes, Space telescopes, Spectral resolution, Photodetectors, Spectrometer engineering, Picosecond phenomena

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Proceedings Article | 2 August 2014 Paper

SAFARI new and improved: extending the capabilities of SPICA's imaging spectrometer

Peter Roelfsema, Martin Giard, Francisco Najarro, Kees Wafelbakker, Willem Jellema, Brian Jackson, Bruce Sibthorpe, Marc Audard, Yasuo Doi, Anna di Giorgio, Matthew Griffin, Frank Helmich, Inga Kamp, Franz Kerschbaum, Michael Meyer, David Naylor, Takashi Onaka, Albrecht Poglitch, Luigi Spinoglio, Floris van der Tak, Bart Vandenbussche

Proceedings Volume 9143, 91431K (2014) https://doi.org/10.1117/12.2056449

KEYWORDS: Galactic astronomy, Sensors, Stars, Spectroscopy, Fourier transforms, Space telescopes, Planets, Telescopes, Mirrors, Satellites

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