The technical challenges of the Solar-Orbiter EUI instrument

Halain, Jean-Philippe; Rochus, Pierre; Appourchaux, T.; Berghmans, D.; Harra, L. K.; Schühle, U.; Auchère, F.; Zhukov, A. N.; Renotte, Étienne; Defise, Jean-Marc; Rossi, Laurence; Fleury-Frenette, Karl; Jacques, Lionel; Hochedez, J.‐F.; Moussa, A. Ben

doi:10.1117/12.857976

Cited by 11 publications

(14 citation statements)

References 4 publications

(3 reference statements)

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“…Two aluminum filters are used to reject infrared and visible light. One is placed at the end of the front baffle and the second one between the secondary mirror and the detector array [6].…”

Section: B Design Trade-offmentioning

confidence: 99%

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EUV high resolution imager on-board solar orbiter: optical design and detector performances

Halain

Mazzoli

Rochus

et al. 2017

International Conference on Space Optics — ICSO 2012

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Abstract-The EUV high resolution imager (HRI) channel of the Extreme Ultraviolet Imager (EUI) on-board SolarDue to the instrument compactness and the constraints on the optical design, the channel performance is very sensitive to the manufacturing, alignments and settling errors. A trade-off between two optical layouts was therefore performed to select the final optical design and to improve the mirror mounts. The effect of diffraction by the filter mesh support and by the mirror diffusion has been included in the overall error budget. Manufacturing of mirror and mounts has started and will result in thermo-mechanical validation on the EUI instrument structural and thermal model (STM).Because of the limited channel entrance aperture and consequently the low input flux, the channel performance also relies on the detector EUV sensitivity, readout noise and dynamic range. Based on the characterization of a CMOS-APS back-side detector prototype, showing promising results, the EUI detector has been specified and is under development. These detectors will undergo a qualification program before being tested and integrated on the EUI instrument.

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Section: B Design Trade-offmentioning

confidence: 99%

“…The entrance pupil is located at the entrance of a front baffle [5]. Two aluminum filters are used to reject infrared and visible light.…”

Section: B Design Trade-offmentioning

confidence: 99%

EUV high resolution imager on-board solar orbiter: optical design and detector performances

Halain

Mazzoli

Rochus

et al. 2017

International Conference on Space Optics — ICSO 2012

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“…The EUI instrument is composed of two units, an Optical Bench System (OBS) and a Common Electrical Box (CEB) [6] . The OBS unit holds three telescope channels: -A High Resolution Imager (100 km resolution) at the hydrogen Lyman-α line [9] (HRI Lya channel), -A High Resolution Imager (100 km resolution) at the extreme ultra-violet (EUV) 174 Ǻ line (HRI EUV channel), -A Full Sun Imager (900 km resolution) at alternatively the EUV 174 Ǻ and 304 Ǻ lines [4], [5] (FSI channel).…”

Section: Introductionmentioning

confidence: 99%

“…The Extreme Ultraviolet Imager (EUI) instrument [6][10] [13] [14] is one of the ten scientific instruments of the Solar Orbiter mission [1], [2], [3], [12] dedicated to the observation of the Sun's atmosphere and heliosphere.…”

Section: Introductionmentioning

confidence: 99%

The extreme ultraviolet imager of solar orbiter: optical design and alignment scheme

et al. 2015

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The Extreme Ultraviolet Imager (EUI) is one of the remote sensing instruments on-board the Solar Orbiter mission. It will provide dual-band full-Sun images of the solar corona in the extreme ultraviolet (17.1 nm and 30.4 nm), and highresolution images of the solar disk in both extreme ultraviolet (17.1 nm) and vacuum ultraviolet (Lyman-alpha 121.6 nm).The EUI optical design takes heritage of previous similar instruments. The Full Sun Imager (FSI) channel is a singlemirror Herschel design telescope. The two High Resolution Imager (HRI) channels are based on a two-mirror optical refractive scheme, one Ritchey-Chretien and one Gregory optical design for the EUV and the Lyman-alpha channels, respectively.The spectral performances of the EUI channels are obtained thanks to dedicated mirror multilayer coatings and specific band-pass filters. The FSI channel uses a dual-band mirror coating combined with aluminum and zirconium band-pass filters. The HRI channels use optimized band-pass selection mirror coatings combined with aluminum band-pass filters and narrow band interference filters for Lyman-alpha.The optical performances result from accurate mirror manufacturing tolerances and from a two-step alignment procedure. The primary mirrors are first co-aligned. The HRI secondary mirrors and focal planes positions are then adjusted to have an optimum interferometric cavity in each of these two channels. For that purpose a dedicated alignment test setup has been prepared, composed of a dummy focal plane assembly representing the detector position.Before the alignment on the flight optical bench, the overall alignment method has been validated on the Structural and Thermal Model, on a dummy bench using flight spare optics, then on the Qualification Model to be used for the system verification test and qualifications.

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“…To achieve the EUI performances, a set of new technologies have been developed [9] . As part of the instrument preliminary development phase, breadboards and prototypes have been developed and used to improve the instrument design and characterize the new technologies.…”

Section: Introductionmentioning

confidence: 99%

The EUI instrument on board the Solar Orbiter mission: from breadboard and prototypes to instrument model validation

et al. 2012

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The Solar Orbiter mission will explore the connection between the Sun and its heliosphere, taking advantage of an orbit approaching the Sun at 0.28 AU. As part of this mission, the Extreme Ultraviolet Imager (EUI) will provide full-sun and high-resolution image sequences of the solar atmosphere at selected spectral emission lines in the extreme and vacuum ultraviolet.To achieve the required scientific performances under the challenging constraints of the Solar Orbiter mission it was required to further develop existing technologies. As part of this development, and of its maturation of technology readiness, a set of breadboard and prototypes of critical subsystems have thus been realized to improve the overall instrument design.The EUI instrument architecture, its major components and sub-systems are described with their driving constraints and the expected performances based on the breadboard and prototype results. The instrument verification and qualification plan will also be discussed. We present the thermal and mechanical model validation, the instrument test campaign with the structural-thermal model (STM), followed by the other instrument models in advance of the flight instrument manufacturing and AIT campaign.

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The technical challenges of the Solar-Orbiter EUI instrument

Cited by 11 publications

References 4 publications

EUV high resolution imager on-board solar orbiter: optical design and detector performances

EUV high resolution imager on-board solar orbiter: optical design and detector performances

The extreme ultraviolet imager of solar orbiter: optical design and alignment scheme

The EUI instrument on board the Solar Orbiter mission: from breadboard and prototypes to instrument model validation

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