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24 September 2012 Developments of the wideband spectropolarimeter of the Domeless Solar Telescope at Hida Observatory
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Abstract
We developed a new universal spectropolarimeter on the Domeless Solar Telescope at Hida Observatory to realize precise spectropolarimetric observations in a wide range of wavelength in visible and near infrared. The system aims to open a new window of plasma diagnostics by using Zeeman effect, Hanle effect, Stark effect, and impact polarization to measure the external magnetic field, electric field, and anisotropies in atomic excitation in solar atmosphere. The polarimeter consists of a 60 cm aperture vacuum telescope, a high dispersion vacuum spectrograph, polarization modulator and analyser composed of a continuously rotating waveplate whose retardation is constant in 400 - 1100 nm and Wallaston prisms located closely behind the focus of the telescope, and a fast and high sensitive CCD camera or a infrared camera. The duration for this polarimeter's achieving photometric accuracy of 10-3 is 30 - 60 s. Instrumental polarization of the telescope is calibrated by using a remotely controllable turret accommodating linear polarizer attached at the entrance window of the telescope to induce well known polarized light into the telescope. Thus a Mueller matrix model of the telescope is established to compensate the instrumental polarization included in observed data within the required accuracy.
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Tetsu Anan, Kiyoshi Ichimoto, Akihito Oi, Goichi Kimura, Yoshikazu Nakatani, and Satoru Ueno "Developments of the wideband spectropolarimeter of the Domeless Solar Telescope at Hida Observatory", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84461C (24 September 2012); https://doi.org/10.1117/12.925639
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