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Reflectivity-enhancement at low x-ray energies in astronomical telescopes using low-density overcoatings: alternative materials and deposition methods

  • Low density overcoatings (mainly based on materials containing Carbon) onto usual high-density coatings (based i.e. on materials like e.g. like Ir, Au or Pt) have been proposed since many years ago in order to enhance the X- ray reflectivity at low energy (between 0.5 and 4 keV) of X-ray astronomical optics. The trick is to make use of the total reflection from the thin low-density material (which does not suffer much the photoelectric absorption) at low X-ray energies; the reflection of photons at higher energies (< 4 keV) occurs thanks to the much denser material under the overcoating. For several future projects, like e.g. ATHENA, LYNX and eXTP, it is foreseen the use of low-density overcoatings that will importantly increase the effective area at low X-ray energies. In this paper we will introduce the use of overcoatings based on materials different from the usual ones considered so far like C, B4C and SiC. In particular, we will discuss about a novel approach based on the use of thin layer of a Carbon-like materials deposited using a dip coating method. A possible combination with an intermediate thin layer of Chromium deposited e.g. via sputtering onto the usual high density material (Ir, Au or Pt) before the application of the Carbon-like material is also considered in the study, because it can further greatly enhance the soft X-ray effective area of future X-ray telescopes.
Metadaten
Author:Giovanni Pareschi, Marta Maria Civitani, Giorgia Sironi, Yang Yang, Vincenzo Cotroneo, Giuseppe Valsecchi, Luca Magagnin, Thorsten DöhringORCiD, Miranda Bradshaw, Vadim Burwitz, Carlo Pelliciari
DOI:https://doi.org/https://doi.org/10.1117/12.2532392
Parent Title (English):Proceedings of SPIE
Publisher:SPIE
Document Type:Conference Proceeding
Language:English
Year of Completion:2019
Date of first Publication:2019/10/21
Creating Corporation:Osservatorio Astronomico di Brera
Contributing Corporation:Technische Hochschule Aschaffenburg
Release Date:2020/01/28
Tag:X-ray; coating; iridium; telescope
GND Keyword:Röntgenteleskop
Volume:2019
Issue:11119
Page Number:13
First Page:11119OS-1
Last Page:11119OS-13
Urheberrecht:1
research focus :Materials / Innovative Material Processing
Materials / Material Testing & Sensor Technology
Licence (German):Keine Lizenz - es gilt das deutsche Urheberrecht
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