Design concepts of EUV polarimeter

Raveena Khan; K. Nagaraju; DVS Phanindra

doi:10.1117/12.2682729

5 October 2023 Design concepts of EUV polarimeter

Raveena Khan, K. Nagaraju, DVS Phanindra

Proceedings Volume 12679, Optics for EUV, X-Ray, and Gamma-Ray Astronomy XI; 126790T (2023) https://doi.org/10.1117/12.2682729
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

The solar corona is a complex and dynamic region primarily controlled by the magnetic fields. Hence the routine measurement of these fields is crucial. Magnetic field information remains embedded in the polarization profiles of the spectral lines, which can be quantified through spectropolarimetry. Differential Hanle effect is a promising diagnostic tool to probe weak coronal magnetic fields and their vector properties. In a recent study we have found several combinations of spectral lines located in the wavelength range 100 to 1210 Å suitable for the above purpose whose critical Hanle field lies in the range of 0.01-200 Gauss. Since the background emission from the Sun’s underlying layers, such as the photosphere and the chromosphere, is almost negligible at these short wavelengths, the coronagraphic technique is not required to study the solar corona, thereby enabling both on-disk and off-limb measurements. Yet there is no EUV polarimeter built for solar observations. In this context we explored a few polarimeter concepts based on the configurations of two and three reflecting mirrors. The performances of these configurations are studied in terms of their throughput and polarizing power using Zemax software in the wavelength range 740-780 Å. They are also compared with different coating materials namely, BaF₂, MgF₂ and LiF. It is found that BaF₂ has significantly higher throughput and polarizing power in the above stated wavelength range.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Raveena Khan, K. Nagaraju, and DVS Phanindra "Design concepts of EUV polarimeter", Proc. SPIE 12679, Optics for EUV, X-Ray, and Gamma-Ray Astronomy XI, 126790T (5 October 2023); https://doi.org/10.1117/12.2682729

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