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Nis C. Gellert
Researcher at Technical University of Denmark
Publications - 25
Citations - 180
Nis C. Gellert is an academic researcher from Technical University of Denmark. The author has contributed to research in topics: Coating & Engineering. The author has an hindex of 6, co-authored 15 publications receiving 120 citations. Previous affiliations of Nis C. Gellert include National Space Institute.
Papers
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Proceedings ArticleDOI
Design, development, and performance of X-ray mirror coatings for the ATHENA mission
Desiree Della Monica Ferreira,Sonny Massahi,Finn Erland Christensen,Brian Shortt,Marcos Bavdaz,Maximilien J. Collon,Boris Landgraf,Nis C. Gellert,Jakob Korman,Paschalis Dalampiras,Ida F. Rasmussen,Ifikratis Kamenidis,Michael Krumrey,Swenja Schreiber +13 more
TL;DR: In this article, the authors report the latest results on coating design optimisation and optics performance for the present Ir/B4C baseline coating and alternative designs and materials, including bilayers and linear graded multilayers.
Proceedings ArticleDOI
Performance and stability of mirror coatings for the ATHENA mission
Desiree Della Monica Ferreira,Sara Svendsen,Sonny Massahi,Atefeh Jafari,Lan M. Vu,Jakob Korman,Nis C. Gellert,Finn Erland Christensen,Shima Kadkhodazadeh,Takeshi Kasama,Brian Shortt,Marcos Bavdaz,Maximilien J. Collon,Boris Landgraf,Michael Krumrey,L. Cibik,Swenja Schreiber,Anja Schubert +17 more
TL;DR: In this article, the expected coating performance based on design and simulations, tested coating performance evaluated by means of X-ray reflectometry and short and long term stability of several materials considered as coating options for the Xray mirrors of the ATHENA mission was presented.
Proceedings ArticleDOI
Performance simulations for the ground-based, expanded-beam x-ray source BEaTriX
Daniele Spiga,Bianca Salmaso,Stefano Basso,Mauro Ghigo,Giorgia Sironi,G. Vecchi,Vincenzo Cotroneo,Paolo Conconi,Giovanni Pareschi,Gianpiero Tagliaferri,Marcos Bavdaz,Ivo Ferreira,Luigina Arcangeli,Massimilano Rossi,Vadim Burwitz,Surangkhana Rukdee,Gisela Hartner,Thomas Mueller,Thomas Schmidt,Andreas Langmeier,Desiree Della Monica Ferreira,Nis C. Gellert,Sonny Massahi,Finn Erland Christensen +23 more
TL;DR: In this paper, a set of comprehensive optical simulations were used to predict the collimation performances of the paraboloidal mirror, including the effect of surface errors obtained from metrology.
Proceedings ArticleDOI
Manufacturing and testing of the X-ray collimating mirror for the BEaTriX facility
G. Vecchi,Vincenzo Cotroneo,Mauro Ghigo,Stefano Basso,Bianca Salmaso,Giorgia Sironi,Daniele Spiga,Paolo Conconi,Giovanni Pareschi,Gianpiero Tagliaferri,Vadim Burwitz,Gisela Hartner,Thomas Müller,Surangkhana Rukdee,Thomas Schmidt,Finn Erland Christensen,Desiree Della Monica Ferreira,Nis C. Gellert,Sonny Massahi,Marcos Bavdaz,Ivo Ferreira +20 more
TL;DR: In this article, the authors present the development and test of the collimating mirror, a paraboloid sector having an optical surface of 400 mm ´ 60 mm and sagittal radii of about 155 mm.
Proceedings ArticleDOI
The effect of deposition process parameters on thin film coatings for the Athena X-ray optics
Sonny Massahi,Desiree Della Monica Ferreira,Finn Erland Christensen,Nis C. Gellert,Sara Svendsen,Peter L. Henriksen,A. S. Jegers,Maximilien J. Collon,Boris Landgraf,David Girou,Aniket Thete,Brian Shortt,Ivo Ferreira,Marcos Bavdaz,Waldemar Schönberger,Axel Langer +15 more
TL;DR: In this article, a literature study of the coating process parameter space and an overview of the thin film properties with a focus on micro roughness, chemical composition and wear resistance when deposited under various process conditions is presented.