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Proceedings Paper

The polarization optics for the European Solar Telescope (EST)
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Paper Abstract

EST (European Solar Telescope) is a 4-m class solar telescope, which is currently in the conceptual design phase. EST will be located at the Canary Islands and aims at observations with the best possible spectral, spatial and temporal resolution and best polarimetric performance, of the solar photosphere and chromosphere, using a suite of instruments that can efficiently produce two-dimensional spectropolarimetric information of the thermal, dynamic and magnetic properties of the plasma over many scale heights, and ranging from λ=350 until 2300 nm. In order to be able to fulfill the stringent requirements for polarimetric sensitivity and accuracy, from the very beginning the polarimetry has been included in the design work. The overall philosophy has been to use a combination of techniques, which includes a telescope with low (and stable) instrumental polarization, optimal full Stokes polarimeters, differential measurement schemes, fast modulation and demodulation, and accurate calibration. The current baseline optical layout consists of a 14-mirror layout, which is polarimetrically compensated and nonvarying in time. In the polarization free F2 focus ample space is reserved for calibration and modulators and a polarimetric switch. At instrument level the s-, and p-planes of individual components are aligned, resulting in a system in which eigenvectors can travel undisturbed through the system.

Paper Details

Date Published: 20 July 2010
PDF: 12 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77356I (20 July 2010); doi: 10.1117/12.857817
Show Author Affiliations
F. C. M. Bettonvil, Utrecht Univ. (Netherlands)
M. Collados, Instituto de Astrofísica de Canarias (Spain)
A. Feller, Max-Planck-Institut für Sonnensystemforschung (Germany)
B. F. Gelly, CNRS, Themis S.L. (Spain)
C. U. Keller, Utrecht Univ. (Netherlands)
T. J. Kentischer, Kiepenheuer-Institut für Sonnenphysik, Albert-Ludwigs-Univ. Freiburg (Germany)
A. López Ariste, CNRS, Themis S.L. (Spain)
O. Pleier, Max-Planck-Institut für Sonnensystemforschung (Germany)
F. Snik, Utrecht Univ. (Netherlands)
H. Socas-Navarro, Instituto de Astrofísica de Canarias (Spain)

Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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