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Modelling of a lens antenna receiver system for NASA GUSTO
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The radiation at terahertz (THz) frequency range (1 THz = 300 μm in wavelength)
provides us a powerful window into cosmic evolution, from the birth and explosion of
stars to the evolution of galaxies and the universe itself. The THz is a largely unexplored
region in the electro-magnetic spectrum, partly owing to technological constraints and
partly due to atmospheric absorption on the Earth. Consequently, THz astronomy observations
are best performed from space-based or balloon-borne telescopes, like the
proposed NASA balloon GUSTO mission. The observations will be complementary to
other space missions like Hershel’s HIFI instrument.
In this work, a model of GUSTO’s optical system was proposed and analysed in order
to improve its efficiency in detecting three of the most important terahertz lines, [NII],
[CII] and [OI], with multi-pixel heterodyne cameras. Moreover, simulations were performed
with PILRAP, a antenna simulation software, to study the parameters that affect
the optical f# number and radiation pattern of a 5 mm diameter lens system, and to
explain the heterodyne sensitivity differences between a 10 mm lens and 3.1 mm lenses.
Outcome of my thesis work concludes the feasibility to use smaller lens for GUSTO’s
heterodyne arrays.
Descrição
Palavras-chave
GUSTO THz HEB Optic Design Lens Design PILRAP