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Nicolai Brejnholt
Researcher at Lawrence Livermore National Laboratory
Publications - 35
Citations - 4151
Nicolai Brejnholt is an academic researcher from Lawrence Livermore National Laboratory. The author has contributed to research in topics: Telescope & X-ray optics. The author has an hindex of 14, co-authored 35 publications receiving 3784 citations. Previous affiliations of Nicolai Brejnholt include Technical University of Denmark.
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Proceedings ArticleDOI
Hard x-ray/soft gamma-ray telescope designs for future astrophysics missions
Desiree Della Monica Ferreira,Finn Erland Christensen,Michael J. Pivovaroff,Nicolai Brejnholt,Mónica Fernández-Perea,Niels Jørgen Stenfeldt Westergaard,Anders Clemen Jakobsen,Marie-Anne Descalle,Regina Soufli,Julia Vogel +9 more
TL;DR: In this paper, the authors present several concept designs of hard X-ray/soft λ-ray focusing telescopes for future astrophysics missions, based on depth graded multilayer coatings.
Journal ArticleDOI
The Rainwater Memorial Calibration Facility for X-Ray Optics
Nicolai Brejnholt,Finn Erland Christensen,Charles J. Hailey,Nicolas M. Barrière,William W. Craig,Brian W. Grefenstette,Jason E. Koglin,Kristin K. Madsen,Julia Vogel,Hongjun An,Kenneth L. Blaedel,Josh Brown,T. Decker,Zeshan Haider,Anders Clemen Jakobsen,Carsten P. Cooper-Jensen,Kaya Mori,Melania Nynka,Michael J. Pivovaroff,Clio Sleator,Dennis Stefanik,Marcela Stern,Gordon Tajiri,Douglas Thornhill,Jeremy S. Cushman +24 more
TL;DR: The ground calibration of the NuSTAR optics posed a challenge as the need to suppress finite source distance effects over the full optic and the energy range of interest were unique requirements not met by any existing facility as discussed by the authors.
Journal ArticleDOI
Atomic scattering factor of the ASTRO-H (Hitomi) SXT reflector around the gold's L edges.
Naomichi Kikuchi,Sho Kurashima,Manabu Ishida,Ryo Iizuka,Yoshitomo Maeda,Takayuki Hayashi,Takashi Okajima,Hironori Matsumoto,Ikuyuki Mitsuishi,Shigetaka Saji,Toshiki Sato,Sasagu Tachibana,Hideyuki Mori,Finn Erland Christensen,Nicolai Brejnholt,Kiyofumi Nitta,Tomoya Uruga +16 more
TL;DR: The edges associated with the L-I, II, and III transitions are identified, of which the depths are found to be roughly 60% shallower than those expected from the Henke's atomic scattering factor.
Proceedings ArticleDOI
The Nuclear Spectroscopic Telescope Array (NuSTAR)
Fiona A. Harrison,Steven E. Boggs,Finn Erland Christensen,William W. Craig,Charles J. Hailey,Daniel Stern,William W. Zhang,Lorella Angelini,Hongjun An,Varun Bhalereo,Nicolai Brejnholt,L. R. Cominsky,W. Rick Cook,Melania Doll,Paolo Giommi,Brian W. Grefenstette,Allan Hornstrup,Victoria M. Kaspi,Yunjin Kim,Takao Kitaguchi,Jason E. Koglin,Carl Christian Liebe,Greg Madejski,Kristin K. Madsen,Peter H. Mao,David L. Meier,Hiromasa Miyasaka,Kaya Mori,M. Perri,Michael J. Pivovaroff,Simonetta Puccetti,Vikram Rana,Andreas Zoglauer +32 more
TL;DR: The Nuclear Spectroscopic Telescope Array (NuSTAR) is a NASA Small Explorer mission that will carry the first focusing hard X-ray (5 -- 80 keV) telescope to orbit as mentioned in this paper.
Journal ArticleDOI
Optical constants of magnetron sputtered Pt thin films with improved accuracy in the N- and O-electronic shell absorption regions
Regina Soufli,Franck Delmotte,Julia Meyer-Ilse,Farhad Salmassi,Nicolai Brejnholt,Sonny Massahi,David Girou,Finn Erland Christensen,Eric M. Gullikson +8 more
TL;DR: In this article, a self-consistent determination of the optical constants (refractive index) of Pt using a combination of photoabsorption and reflectance data in the photon energy range 25 −778 eV was presented.