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Future perspectives in solar hot plasma observations in the soft X-rays

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Abstract

The soft X-rays (SXRs: 90–150 Å) are among the most interesting spectral ranges to be investigated in the next generation of solar missions due to their unique capability of diagnosing phenomena involving hot plasma with temperatures up to 15 MK. Multilayer (ML) coatings are crucial for developing SXR instrumentation, as so far they represent the only viable option for the development of high-efficiency mirrors in the this spectral range. However, the current standard MLs are characterized by a very narrow spectral band which is incompatible with the science requirements expected for a SXR spectrometer. Nevertheless, recent advancement in the ML technology has made the development of non-periodic stacks repeatable and reliable, enabling the manufacturing of SXR mirrors with a valuable efficiency over a large range of wavelengths. In this work, after reviewing the state-of-the-art ML coatings for the SXR range, we investigate the possibility of using M-fold and aperiodic stacks for the development of multiband SXR spectrometers. After selecting a possible choice of key spectral lines, some trade-off studies for an eight-bands spectrometer are also presented and discussed, giving an evaluation of their feasibility and potential performance.

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Authors and Affiliations

  1. National Research Council of Italy, Institute for Photonics and Nanotechnologies, via Trasea 7, 35131, Padova, Italy

    Alain Jody Corso

  2. DAMTP, CMS, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA, UK

    Giulio Del Zanna

  3. Bay Area Environmental Research Institute, NASA Research Park, Moffett Field, CA, 94035, USA

    Vanessa Polito

  4. Lockheed Martin Solar and Astrophysics Laboratory, Building 252, 3251 Hanover Street, Palo Alto, CA, 94304, USA

    Vanessa Polito

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  1. Alain Jody Corso
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  2. Giulio Del Zanna
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Correspondence to Alain Jody Corso.

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Corso, A.J., Del Zanna, G. & Polito, V. Future perspectives in solar hot plasma observations in the soft X-rays. Exp Astron 51, 453–474 (2021). https://doi.org/10.1007/s10686-021-09756-2

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