R
Ralf K. Heilmann
Researcher at Massachusetts Institute of Technology
Publications - 173
Citations - 2983
Ralf K. Heilmann is an academic researcher from Massachusetts Institute of Technology. The author has contributed to research in topics: Grating & Diffraction grating. The author has an hindex of 28, co-authored 166 publications receiving 2668 citations. Previous affiliations of Ralf K. Heilmann include University of Virginia & University of Arizona.
Papers
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Proceedings ArticleDOI
Raytracing with MARX: x-ray observatory design, calibration, and support
John E. Davis,Marshall W. Bautz,Daniel Dewey,Ralf K. Heilmann,John C. Houck,David P. Huenemoerder,Herman L. Marshall,Michael A. Nowak,Mark L. Schattenburg,Norbert S. Schulz,Randall K. Smith +10 more
TL;DR: The MARX ray-trace program was originally developed to simulate event data from the trans-mission grating spectrometers on-board the Chandra X-ray Observatory (CXO) as mentioned in this paper.
Journal ArticleDOI
Lynx X-Ray Observatory: an overview
Jessica A. Gaskin,Douglas A. Swartz,Alexey Vikhlinin,Feryal Özel,Karen Gelmis,Jonathan W. Arenberg,Simon R. Bandler,Mark W. Bautz,M. Civitani,A. Domínguez,Megan E. Eckart,A. Falcone,Enectali Figueroa-Feliciano,Mark D. Freeman,Hans Moritz Günther,Keith A. Havey,Ralf K. Heilmann,Kiranmayee Kilaru,Ralph P. Kraft,Kevin S. McCarley,Randall L. McEntaffer,Giovanni Pareschi,William R. Purcell,Paul B. Reid,Mark L. Schattenburg,Daniel A. Schwartz,Eric D. Schwartz,Harvey Tananbaum,Grant R. Tremblay,William W. Zhang,John ZuHone +30 more
TL;DR: The Lynx architecture enables a broad range of unique and compelling science to be carried out mainly through a General Observer Program, envisioned to include detecting the very first seed black holes, revealing the high-energy drivers of galaxy formation and evolution, and characterizing the mechanisms that govern stellar evolution and stellar ecosystems.
Journal ArticleDOI
Analyses of vector Gaussian beam propagation and the validity of paraxial and spherical approximations.
TL;DR: In this article, the angular spectrum of a Gaussian beam is represented as a power-series expansion, where the higher-order terms diverge at locations that are sufficiently far from the initial boundary, yielding unphysical results.
Journal ArticleDOI
Dimensional metrology for nanometre-scale science and engineering: towards sub-nanometre accurate encoders
TL;DR: In this article, the nanoruler was used to develop grating-and grid-based scales with sub-nanometre accuracy over 300mm dimensions using the scanning-beam interference lithography tool.
Journal ArticleDOI
Fabrication of ultrahigh aspect ratio freestanding gratings on silicon-on-insulator wafers
TL;DR: In this paper, a silicon-on-insulator (SOI) process was used for the fabrication of ultra-high aspect ratio freestanding gratings for high efficiency x-ray and extreme ultraviolet spectroscopy.