20 citations · 123 across the 19 of their papers we have counts for
19 papers
Lynx2030 Science Analysis Group: Final Report
Lynx2030 Science Analysis Group, Simon R. Bandler, Laura W. Brenneman +51
The Lynx2030 Science Analysis Group (SAG) was convened to reassess the scientific goals and technical drivers of the Lynx mission concept amid a rapidly evolving astrophysics lands…
X-ray grating spectroscopy as a mission enhancement
Hans Moritz Guenther, Ehud Behar, Joel N. Bregman +27
We propose to add instruments to any potential future X-ray mission with focussing optics that is considered in NASA's ASTRA framework. Such an instrument is a necessity to study A…
Diffraction Gratings for X-ray Spectroscopy
Ralf K. Heilmann, David P. Huenemoerder, Jake A. McCoy +1
X-ray diffraction gratings play an essential role in high-resolution spectroscopy of astrophysical phenomena. We present some scientific highlights from the X-ray grating spectrome…
Concept of a Double Tilted Rowland Spectrograph for X-rays
Hans Moritz Günther, Casey T. DeRoo, Ralf K. Heilmann +1
High-resolution spectroscopy in soft X-rays ( keV) requires diffractive elements to resolve any astrophysically relevant diagnostics, such as closely spaced lines, weak absorpt…
Transmission grating arrays for the X-ray spectrometer on Arcus Probe
Ralf K. Heilmann, Alexander R. Bruccoleri, James A. Gregory +6
The Arcus Probe mission concept has been submitted as an Astrophysics Probe Explorer candidate. It features two co-aligned high-resolution grating spectrometers: one for the soft x…
Arcus X-ray telescope performance and alignment
Hans Moritz Günther, Peter Cheimets, Eric D. Miller +4
Arcus is a concept for a probe class mission to deliver high-resolution FUV and X-ray spectroscopy. For X-rays, it combines cost-effective silicon pore optics (SPO) with high-throu…
The First Flight of the Marshall Grazing Incidence X-ray Spectrometer (MaGIXS)
Sabrina L. Savage, Amy R. Winebarger, Ken Kobayashi +34
The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) sounding rocket experiment launched on July 30, 2021 from the White Sands Missile Range in New Mexico. MaGIXS is a unique…
X-ray performance of critical-angle transmission grating prototypes for the Arcus mission
Ralf K. Heilmann, Alexander R. Bruccoleri, Vadim Burwitz +12
Arcus is a proposed soft x-ray grating spectrometer Explorer. It aims to explore cosmic feedback by mapping hot gases within and between galaxies and galaxy clusters and characteri…
Calibration of the MaGIXS experiment II: Flight Instrument Calibration
P. S. Athiray, Amy R. Winebarger, Patrick Champey +21
The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) is a sounding rocket experiment that observes the soft X-ray spectrum of the Sun from 6.0 - 24 Angstrom (0.5 - 2.0 keV),…
Stress tensor mesostructures for freeform shaping of thin substrates
Youwei Yao, Brandon Chalifoux, Ralf Heilmann +1
Stress-induced shaping, which deforms thin substrates utilizing stressed surface coatings, has enabled and enhanced a host of applications in past decades. Owing to the touchless f…
Toward volume manufacturing of high-performance soft x-ray critical-angle transmission gratings
Ralf K. Heilmann, Alexander R. Bruccoleri, Jungki Song +11
High-resolution () x-ray absorption and emission line spectroscopy in the soft x-ray band is a crucial diagnostic for the exploration of the properties of ubiquitou…
A Small Satellite Version of a Broad-band Soft X-ray Polarimeter
Herman L. Marshall, Sarah N. T. Heine, Alan Garner +16
We describe a new implementation of a broad-band soft X-ray polarimeter, substantially based on a previous design. This implementation, the Pioneer Soft X-ray Polarimeter (PiSoX) i…
Lynx grating spectrometer design: Optimizing chirped transmission gratings
Hans Moritz Günther, Ralf K. Heilmann
Lynx is one of four large-mission concept studies for NASA's 2020 Decadal survey. The design reference mission includes an X-ray grating spectrometer (XGS) based on critical-angle…
Optical design of diffraction-limited X-ray telescopes
Brandon D. Chalifoux, Ralf K. Heilmann, Herman L. Marshall +1
Astronomical imaging with micro-arcsecond (as) angular resolution could enable breakthrough scientific discoveries. Previously-proposed as X-ray imager designs have been inte…
Demonstration of resolving power for a space-based x-ray transmission grating spectrometer
Ralf K. Heilmann, Jeffery Kolodziejczak, Alexander R. Bruccoleri +2
We present measurements of the resolving power of a soft x-ray spectrometer consisting of 200 nm-period lightweight, alignment-insensitive critical-angle transmission (CAT) grating…
Critical-angle x-ray transmission grating spectrometer with extended bandpass and resolving power > 10,000
Ralf K. Heilmann, Alexander R. Bruccoleri, Jeffery Kolodziejczak +4
Several high priority subjects in astrophysics can be addressed by a state-of-the-art soft x-ray grating spectrometer (XGS). An Explorer-scale, large-area (> 1,000 cm2), high resol…
Structure and Evolution of Pre-Main Sequence Stars
Norbert S. Schulz, Glenn Allen, Mark W. Bautz +28
Low-mass pre-main sequence (PMS) stars are strong and variable X-ray emitters, as has been well established by EINSTEIN and ROSAT observatories. It was originally believed that thi…
Distribution and Structure of Matter in and around Galaxies
Norbert S. Schulz, Glenn Allen, Mark W. Bautz +24
Understanding the origins and distribution of matter in the Universe is one of the most important quests in physics and astronomy. Themes range from astro-particle physics to chemi…
Rotationally symmetric ordered phase in the three-state antiferromagnetic Potts model
Ralf K. Heilmann, Jian-Sheng Wang, Robert H. Swendsen
We investigate the three-state antiferromagnetic Potts model on a simple cubic lattice with a cluster flipping Monte Carlo simulation algorithm in the temperature region below the…