The Simons Observatory: Characterization of absorbing Neutral Density Filters

Shreya Sutariya; Kathleen Harrington; Thomas Alford; Carlos Sierra; Jeff McMahon

doi:10.1117/12.2630538

26 August 2022 The Simons Observatory: Characterization of absorbing Neutral Density Filters

Shreya Sutariya, Kathleen Harrington, Thomas Alford, Carlos Sierra, Jeff McMahon

Proceedings Volume PC12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI; PC1219008 (2022) https://doi.org/10.1117/12.2630538
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

Microwave absorbers are commonly used as neutral density filters to enable sensitive detectors which saturate with room temperature loads to be characterized in the laboratory setting. We present transmission and reflection measurements of two types of machinable magnetically loaded cured epoxies (Eccosorb MF-112 and MF-114) in millimeter to sub-millimeter wavelengths at room and cryogenic temperatures. These measurements are made using an ultra broadband coherent source (reflection from 30-500 GHz at 300K and transmission from 30-300GHz at 300 and 77K) and a Fourier Transform Spectrometer (70-170 GHz at 4K). We present the dielectric properties of these materials and catalog the differences between presently available machinable samples and commonly cited epoxy-based samples.

Conference Presentation

Citation Download Citation

Shreya Sutariya, Kathleen Harrington, Thomas Alford, Carlos Sierra, and Jeff McMahon "The Simons Observatory: Characterization of absorbing Neutral Density Filters", Proc. SPIE PC12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, PC1219008 (26 August 2022); https://doi.org/10.1117/12.2630538

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