Tolerance and alignment study of two-channel telescope spectroscopy for Aspera

Heejoo Choi; Haeun Chung; Carlos Vargas; Aafaque R. Khan; Jason Corliss; Daewook Kim

doi:10.1117/12.2678100

5 October 2023 Tolerance and alignment study of two-channel telescope spectroscopy for Aspera

Heejoo Choi, Haeun Chung, Carlos Vargas, Aafaque R. Khan, Jason Corliss, Daewook Kim

Author Affiliations +

Proceedings Volume PC12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV; PC126770D (2023) https://doi.org/10.1117/12.2678100
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

The warm-hot phase coronal gas, known as the circumgalactic matter (CGM), around galaxy halos plays a critical role in the evolution of galaxies. However, the morphology of the CGM is poorly understood as it is difficult to detect the extreme-UV (EUV) emission from this diffuse gas. Aspera, a small satellite telescope, is designed to map the EUV emission from the CGM of nearby galaxies. In order to achieve high observation efficiency, the payload has a unique dual-channel optical layout sharing a Microchannel plate (MCP) detector. The spectroscopy layout benchmarked the Rowland Circle ( OAP + slit + curved diffractive optics) and adopted a special coating to enhance reflectivity at EUV (~103.2 nm). The unique dual-channel layout requires co-pointing alignment of both channels and tight tolerance of each channel alignment. We reviewed the tolerance and sensitivity analyses of the optical system. The comprehensive Monte Carlo simulation provides the required alignment accuracy, and we proposed appropriate alignment plans using the interferometer and computer-generated hologram (CGH). The proposed alignment strategy is available for quantitative and decomposed evaluation of misalignin

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Citation Download Citation

Heejoo Choi, Haeun Chung, Carlos Vargas, Aafaque R. Khan, Jason Corliss, and Daewook Kim "Tolerance and alignment study of two-channel telescope spectroscopy for Aspera", Proc. SPIE PC12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV, PC126770D (5 October 2023); https://doi.org/10.1117/12.2678100

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KEYWORDS

Telescopes

Spectroscopy

Computer generated holography

Optical alignment

Extreme ultraviolet

Microchannel plates

Galactic astronomy

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