Kavli Affiliate: Ralf K. Heilmann
| First 5 Authors: Ralf K. Heilmann, Alexander R. Bruccoleri, James A. Gregory, Eric M. Gullikson, Hans Moritz Günther
| Summary:
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 UV. 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 (XRS) 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 CCD readout
arrays. Average spectral resolving power $lambda/Delta lambda > 2,500$
($sim 3500$ expected) across the 12-50 AA band and combined effective area
$> 350$ cm$^2$ ($> 470$ cm$^2$ expected) near OVII wavelengths are predicted,
based on the measured x-ray performance of 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.
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