Reference : The Lyman-alpha telescope of the extreme ultraviolet imager on Solar Orbiter
Scientific journals : Article
Engineering, computing & technology : Aerospace & aeronautics engineering
The Lyman-alpha telescope of the extreme ultraviolet imager on Solar Orbiter
Schühle, Udo mailto [> >]
Halain, Jean-Philippe mailto [Université de Liège - ULiège > > CSL (Centre Spatial de Liège) >]
Meining, Stefan mailto [> >]
Teriaca, Luca mailto [> >]
Proceedings of SPIE : The International Society for Optical Engineering
International Society for Optical Engineering
[en] Solar Orbiter ; hydrogen Lyman-α line ; vacuum ultraviolet ; solar telescope
[en] On the Solar Orbiter mission, the Extreme Ultraviolet Imager (EUI) set of filtergraph-telescopes consists of two high-resolution imagers (HRI) and one dual-band full Sun imager (FSI) that will provide images of the solar atmosphere in the extreme ultraviolet and in the Lyman-α line of hydrogen at 121.6 nm. The Lyman-α HRI, in particular, will provide imaging of the upper chromospheres/lower transition region of the Sun at unprecedented high cadence and at an angular resolution of one 1″ (corresponding to a spatial resolution of 200 km at perihelion).
For vacuum-ultraviolet imaging of the Sun the main requirements for the instrumentation are high resolution, high cadence, and large dynamic range. We present here the novel solutions of the instrument design and show in detail the predicted performance of this telescope. We describe in detail how the high throughput and spectral purity at 121.6 nm is achieved. The technical solutions include multilayer coatings of the telescope mirrors for high reflectance at 121.6 nm, combined with interference filters and a multichannel-plate intensified CMOS active pixel camera. We make use of the design flexibilities of this camera to optimize the dynamic range in the focal plane.

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