Design of a soft gamma-ray focusing telescope for the study of nuclear lines

C. M. Hubert Chen; Finn Erland Christensen; Fiona A. Harrison; Peter H. Mao; David L. Windt

doi:10.1117/12.461419

11 March 2003 Design of a soft gamma-ray focusing telescope for the study of nuclear lines

C. M. Hubert Chen, Finn Erland Christensen, Fiona A. Harrison, Peter H. Mao, David L. Windt

Author Affiliations +

Proceedings Volume 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy; (2003) https://doi.org/10.1117/12.461419
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

We have studied the design of astronomical multilayer telescopes optimized for performance from 5 to 200 keV. This region of the spectrum contains important nuclear lines that are observable in supernovae and their remnants. The study of these lines can help to differentiate currently competing theories of supernova explosion. Our telescope design will enable us to measure the spectral lines of isotopes such as Ni-56 in Type Ia supernovae and Ti-44 in core-collapse remnants, as well as to observe active galactic nuclei at gamma-ray energies. We considered the performances of multilayers of various material pairs, including W/Si, Pt/C and Ni93V7/Si, as employed in conical-approximation Wolter I optics. We experimented with dividing the energy band of interest into several sections, and optimizing different groups of mirror shells within a single telescope for each smaller energy band. Different material pairs are also used for different energy bands, in order to obtain a higher overall performance. We also consider the significance of the energy bandwidth on the effectiveness of Joensen's parametrization of the multilayer thickness profile, and on the mirror performance within the band.

Citation Download Citation

C. M. Hubert Chen, Finn Erland Christensen, Fiona A. Harrison, Peter H. Mao, and David L. Windt "Design of a soft gamma-ray focusing telescope for the study of nuclear lines", Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003); https://doi.org/10.1117/12.461419

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