16 - 21 June 2024
Yokohama, Japan
Conference 13093 > Paper 13093-9
Paper 13093-9

Optical alignment of contamination-sensitive far-ultraviolet spectrographs for Aspera SmallSat mission

16 June 2024 • 11:30 - 11:50 Japan Standard Time | Room G414/415, North - 4F

Abstract

Aspera is a NASA Astrophysics Pioneers SmallSat mission designed to study diffuse Ovi emission from the warm-hot phase gas in the halos of nearby galaxies. Its payload consists of two identical Rowland Circle-type long-slit spectrographs, sharing a single MicroChannel plate detector. Each spectrograph channel consists of an off-axis parabola primary mirror and a toroidal diffraction grating optimized for the 1013-1057 Å bandpass. Despite the simple configuration, the optical alignment/integration process for Aspera is challenging due to tight optical alignment tolerances, driven by the compact form factor, and the contamination sensitivity of the Far-Ultraviolet optics and detectors. In this paper, we discuss implementing a novel multi-phase approach to meet these requirements using state-of-the-art optical metrology tools. For coarsely positioning the optics we use a blue-laser 3D scanner while the fine alignment is done with a Zygo interferometer and a custom computer-generated hologram. The detector focus requires iterative in-vacuum alignment using a Vacuum UV collimator. The alignment is done in a controlled cleanroom facility at the University of Arizona.

Presenter

Steward Observatory (United States)
Author
Steward Observatory (United States)
Author
Steward Observatory (United States)
Presenter/Author
Steward Observatory (United States)
Author
Wyant College of Optical Sciences (United States)
Author
Daewook Kim
Wyant College of Optical Sciences (United States)
Author
Steward Observatory (United States)
Author
Keri Hoadley
The Univ. of Iowa (United States)
Author
Carlos J. Vargas
Steward Observatory (United States)
Author
Daniel Truong
Lunar and Planetary Laboratory, University of Arizona (United States)
Author
Lunar and Planetary Laboratory, Steward Observatory, University of Arizona (United States)
Author
Steward Observatory, University of Arizona (United States)
Author
Steward Observatory, Steward Observatory, University of Arizona (United States)
Author
Jamison Noenickx
Steward Observatory, Steward Observatory, University of Arizona (United States)
Author
Jason B. Corliss
The Univ. of Arizona (United States)
Author
Steward Observatory (United States)
Author
Steward Observatory (United States)
Author
Lunar and Planetary Laboratory (United States)
Author
Wyant College of Optical Sciences (United States)
Author
Space Telescope Science Institute (STScI) (United States)
Author
Steward Observatory (United States)
Author
Harrison Bradley
Steward Observatory (United States)
Author
Trenton Brendel
Wyant College of Optical Sciences (United States)
Author
Department of Astronomy, New Mexico State University (United States)
Author
Jasmine Martinez Castillo
Steward Observatory (United States)
Author
Department of Computer Science, The University of Arizona (United States)
Author
Lauren Corlies
Adler Planetarium (United States)
Author
Greyson Davis
The Univ. of Iowa (United States)
Author
Ralf-J ̈urgen Dettmar
Ruhr-Universität Bochum (Germany)
Author
Steward Observatory (United States)
Author
Ascending Node Technologies (United States)
Author
The University of Arizona (United States)
Author
Lunar and Planetary Laboratory (United States)
Author
Ascending Node Technologies (United States)
Author
Department of Physics and Astronomy, University of Notre Dame (United States)
Author
Miriam Keppler
Steward Observatory (United States)
Author
Steward Observatory (United States)
Author
Ascending Node Technologies (United States)
Author
Steward Observatory (United States)
Author
Steward Observatory (United States)
Author
Steward Observatory (United States)
Author
Steward Observatory (United States)
Author
Steward Observatory (United States)
Author
Department of Astronomy, Columbia University (United States)
Author
Ascending Node Technologies (United States)
Author
Oswald Siegmund
Sensor Sciences, LLC (United States)
Author
Rebecca Su
Wyant College of Optical Sciences (United States)
Author
Sumedha Uppnor
The University of Arizona (United States)
Author
Jacob Vider
Steward Observatory (United States)
Author
Steward Observatory (United States)
Author
Lunar and Planetary Laboratory (United States)
Author
Dennis Zaritsky
Steward Observatory (United States)