The development of a breadboard cryogenic optical delay line for DARWIN

Dool, T.C. van den; Kamphues, Fred; Gielesen, W.L.M.; Braam, B. C.; Loix, Nicolas; Kooijman, Peter Paul; Velsink, G.; Stockman, Yvan; Benoît, J.; Sève, F.

doi:10.1117/12.730435

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…The scan mechanism is based on magnetic bearings. The design concept assumed in the reference design was made by TNO [9][10][11], and is shown in Fig. 7.…”

Section: Fts Systemmentioning

confidence: 99%

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

Jellema

Sempere

Naylor

et al. 2017

International Conference on Space Optics — ICSO 2014

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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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“…The scan mechanism is based on magnetic bearings. The design concept assumed in the reference design was made by TNO [9][10][11], and is shown in Fig. 7.…”

Section: Fts Systemmentioning

confidence: 99%

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

Jellema

Sempere

Naylor

et al. 2017

International Conference on Space Optics — ICSO 2014

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“…This optical design incorporated a Mach-Zehnder interferometer in a Cat's Eye configuration. The FTS concept builds on a mechanism developed by TNO for the Darwin mission, which is based on magnetic bearings providing high precision translation at very low cryogenic dissipation [6][7].…”

Section: Introductionmentioning

confidence: 99%

The optical design concept of SPICA-SAFARI

Jellema

Kruizinga²,

Visser³

et al. 2012

Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave

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The Safari instrument on the Japanese SPICA mission is a zodiacal background limited imaging spectrometer offering a photometric imaging (R ≈ 2), and a low (R = 100) and medium spectral resolution (R = 2000 at 100 μm) spectroscopy mode in three photometric bands covering the 34-210 μm wavelength range. The instrument utilizes Nyquist sampled filled arrays of very sensitive TES detectors providing a 2'x2' instantaneous field of view. The all-reflective optical system of Safari is highly modular and consists of an input optics module containing the entrance shutter, a calibration source and a pair of filter wheels, followed by an interferometer and finally the camera bay optics accommodating the focal-plane arrays. The optical design is largely driven and constrained by volume inviting for a compact threedimensional arrangement of the interferometer and camera bay optics without compromising the optical performance requirements associated with a diffraction-and background-limited spectroscopic imaging instrument. Central to the optics we present a flexible and compact non-polarizing Mach-Zehnder interferometer layout, with dual input and output ports, employing a novel FTS scan mechanism based on magnetic bearings and a linear motor. In this paper we discuss the conceptual design of the focal-plane optics and describe how we implement the optical instrument functions, define the photometric bands, deal with straylight control, diffraction and thermal emission in the long-wavelength limit and interface to the large-format FPA arrays at one end and the SPICA telescope assembly at the other end.

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“…The basis for conducting this study is the successful design by TNO, Micromega-Dynamics, and SRON of a bread-board ODL for the DARWIN mission 1 . The DARWIN ODL has a 2-mirror cat's-eye optical layout with magnetic bearing guiding system and voice OPD actuator (see Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Cryogenic magnetic bearing scanning mechanism design for the SPICA/SAFARI Fourier transform spectrometer

et al. 2010

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TNO, together with its partners Micromega and SRON, have designed a cryogenic scanning mechanism for use in the SAFARI Fourier Transform Spectrometer (FTS) on board of the SPICA mission.The optics of the FTS scanning mechanism (FTSM) consists of two back-to-back cat's-eyes. The optics are mounted on a central "back-bone" tube which houses all the important mechatronic parts: the magnetic bearing linear guiding system, a magnetic linear motor serving as the OPD actuator, internal metrology with nanometer resolution, and a launch lock.A magnetic bearing is employed to enable a large scanning stroke in a small volume. It supports the optics in a freefloating way with no friction, or other non-linearities, enabling sub-nanometer accuracy within a single stage with a stroke of -4 mm to +31.5 mm.Because the FTSM will be used at cryogenic temperatures of 4 Kelvin, the main structure and optics are all constructed from 6061 Aluminum. The overall outside dimensions of the FTSM are: 393 x 130 x 125 mm, and the mass is 2.2 kg.

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The development of a breadboard cryogenic optical delay line for DARWIN

Cited by 7 publications

References 2 publications

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

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

The optical design concept of SPICA-SAFARI

Cryogenic magnetic bearing scanning mechanism design for the SPICA/SAFARI Fourier transform spectrometer

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