X-ray evolving universe spectroscopy mission (XEUS): narrow-field imaging high-resolution spectrometer instrument: I

Details X-ray evolving universe spectroscopy mission (XEUS): narrow-field imaging high-resolution spectrometer instrument: I X-ray evolving universe spectroscopy mission (XEUS): narrow-field imaging high-resolution spectrometer instrument: I

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3766..144v&link_type=abstract

Proc. SPIE Vol. 3766, p. 144-151, X-Ray Optics, Instruments, and Missions II, Richard B. Hoover; Arthur B. Walker; Eds.

Physics

Optics

Scientific paper

XEUS: The x-ray evolving universe spectroscopy mission aims to study the astrophysics of some of the most distant and hence youngest known discrete objects in the universe. In particular it specifically will measure the x-ray spectra of objects with a redshift z > 4 at flux levels below 10-17 erg cm-2s-1. At these high redshifts line emission from helium-like iron and oxygen which may be observed in the x-ray spectrum will be shifted down into the soft x-ray band. This places requirements on the spectral resolution and efficiency of any instrument in the focal plane which is to measure the detailed spectra of these faint sources and through the detection of these lines determine the redshift, distance and age. A narrow field low temperature imaging spectrometer covering the energy range 0.05-3 keV is currently considered as a possible element of the suite of focal plane instruments. This instrument, with a field of view of 0.5 arc minutes, an imaging capability matched to the XEUS optics of approximately 2-5 inches, will need to achieve an energy resolution of below approximately 2 eV at 500 eV. Currently a close packed large format array of superconducting tunnel junctions is envisaged operation at a temperature of approximately 30-350 mK. Such an array will be cooled by a closed cycle system comprising a mechanical cooler with a base temperature of 2.5 K and either a low temperature 3He sorption pump providing the very low temperature stage and/or an Adiabatic Demagnetization Refrigeration. In this paper we describe the key requirements of the XEUS low energy imaging spectrometer, the performance based on prototype designs together with soft x-ray test results of prototype arrays.

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