Transmission grating arrays for the X-ray spectrometer on Arcus Probe

被引：0

作者：

Heilmann, Ralf K. ^{[1
]}

Bruccoleri, Alexander R. ^{[2
]}

Gregory, James A. ^{[3
]}

Gullikson, Eric M. ^{[4
]}

Günther, Hans Moritz ^{[5
]}

Hertz, Edward ^{[6
]}

Lambert, Renee D. ^{[3
]}

Young, Douglas J. ^{[3
]}

Schattenburg, Mark L. ^{[1
]}

机构：

[1] Massachusetts Institute of Technology, MIT Kavli Institute for Astrophysics and Space Research, Space Nanotechnology Laboratory, Cambridge, MA

[2] Izentis, LLC, Cambridge, MA

[3] MIT Lincoln Laboratory, Lexington, MA

[4] Lawrence Berkeley National Laboratory, Berkeley, CA

[5] Massachusetts Institute of Technology, MIT Kavli Institute for Astrophysics and Space Research, Cambridge, MA

[6] Harvard-Smithsonian Astrophysical Observatory, Center for Astrophysics, Cambridge, MA

来源：

Journal of Astronomical Telescopes, Instruments, and Systems | 2025年 / 11卷 / 01期

基金：

美国国家航空航天局;

关键词：

Arcus; critical-angle transmission grating; high-resolution X-ray spectroscopy; X-ray spectrometer;

D O I：

10.1117/1.JATIS.11.1.011004

中图分类号：

学科分类号：

摘要：

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-ray band and one for the far ultraviolet. Together, these instruments can provide unprecedented performance to address important key questions about the structure and dynamics of our universe across a large range of length scales. The X-ray spectrometer consists of four parallel optical channels, each featuring an X-ray telescope with a fixed array of 216 lightweight, high-efficiency, blazed transmission gratings, and two charge-coupled device readout arrays. Average spectral resolving power λ/Δλ>2500 (3500 expected) across the 12 to 50 A band and combined effective area >350 cm2 (>470 cm2 expected) near OVII wavelengths are predicted, based on the measured X-ray performance of the spectrometer prototypes and detailed ray trace modeling. We describe the optical and structural design of the grating arrays, from the macroscopic grating petals to the nanoscale gratings bars, grating fabrication, alignment, and X-ray testing. Recent X-ray diffraction efficiency results from chemically thinned grating bars are presented and show performance above mission assumptions. © 2025 SPIE. All rights reserved.

引用

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