Characterizing and reducing the POL-2 instrumental polarization

Per Friberg; David Berry; Giorgio Savini; Dan Bintley; Jessica Dempsey; Sarah Graves; Harriet Parsons

doi:10.1117/12.2314345

9 July 2018 Characterizing and reducing the POL-2 instrumental polarization

Per Friberg, David Berry, Giorgio Savini, Dan Bintley, Jessica Dempsey, Sarah Graves, Harriet Parsons

Proceedings Volume 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX; 107083M (2018) https://doi.org/10.1117/12.2314345
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

Sub-millimeter polarization observations using the POL-2 instrument mounted on the dual wavelength (850/450 μm) 10 k pixel sub-millimeter camera SCUBA-2 is in high demand on the James Clerk Maxwell Telescope (JCMT). The high level of Instrumental Polarization (IP) generated by the Gore-Tex^TM wind blind protecting the telescope is a hampering factor for these observations. The wind blind both introduces an overall linear polarization and a four lobed polarization footprint seen on strong point sources after removal of a beam averaged IP. During commissioning an IP model was developed for the 850 μm band but a good 450 μm model was lacking. This paper describes the effort to improve the 850 μm IP model, establish a 450 μm model and the work to understand and model the IP. During the work the wind blind was removed for a month to isolate the contribution of the wind blind from other sources of the IP. A theoretical model for the non wind blind generated IP has been developed. However, a theoretical model for the wind blind IP is still being worked on.

Citation Download Citation

Per Friberg, David Berry, Giorgio Savini, Dan Bintley, Jessica Dempsey, Sarah Graves, and Harriet Parsons "Characterizing and reducing the POL-2 instrumental polarization", Proc. SPIE 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, 107083M (9 July 2018); https://doi.org/10.1117/12.2314345

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