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Feedhorn development and scalability for Simons Observatory and beyond

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arxiv 1809.07373 v1 pith:IJ7FS3ME submitted 2018-09-19 astro-ph.IM

Feedhorn development and scalability for Simons Observatory and beyond

classification astro-ph.IM
keywords feedhornwillarrayscouplingobservatorypolarizationsimonsangular
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Simons Observatory (SO) will measure the cosmic microwave background (CMB) in both temperature and polarization over a wide range of angular scales and frequencies from 27-270 GHz with unprecedented sensitivity. One technology for coupling light onto the $\sim$50 detector wafers that SO will field is spline-profiled feedhorns, which offer tunability between coupling efficiency and control of beam polarization leakage effects. We will present efforts to scale up feedhorn production for SO and their viability for future CMB experiments, including direct-machining metal feedhorn arrays and laser machining stacked Si arrays.

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