QUBIC VII: The feedhorn-switch system of the technological demonstrator. (arXiv:2008.12721v1 [astro-ph.IM])

QUBIC VII: The feedhorn-switch system of the technological demonstrator. (arXiv:2008.12721v1 [astro-ph.IM])
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We present the design, manufacturing and performance of the horn-switch
system developed for the technological demonstrator of QUBIC (the $Q$&$U$
Bolometric Interferometer for Cosmology). This system is constituted of 64
back-to-back dual-band (150,GHz and 220,GHz) corrugated feed-horns
interspersed with mechanical switches used to select desired baselines during
the instrument self-calibration. We manufactured the horns in aluminum
platelets milled by photo-chemical etching and mechanically tightened with
screws. The switches are based on steel blades that open and close the
wave-guide between the back-to-back horns and are operated by miniaturized
electromagnets. We also show the current development status of the
feedhorn-switch system for the QUBIC full instrument, based on an array of 400
horn-switch assemblies.

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