24 September 2012 The visible tunable filtergraph for the ATST
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The Kiepenheuer-Institut will develop for the Advanced Technology Solar Telescope (ATST) a narrowband tunable filter system (Visible Tunable Filter, VTF) for imaging spectroscopy and spectropolarimetry based on large-format Fabry Perot interferometers. A major challenge for the realization of this instrument is the development of large-format Fabry-Perots with a free aperture of about 250 mm. The instrument will operate in the spectral range between 500 and 900 nm with access to a host of magnetically sensitive lines. The instrument is designed to match the diffraction limit of the 4m-aperture ATST and will be able to observe processes on the sun at spatial scales of 35 km. Its multi-line capability, together with a field of view of one arc minute, and the ability to measure polarization states of the incoming light allow to probe different layers of the solar atmosphere within a couple of seconds. The instrument is capable to vary the spectral sampling, the integration time, and the temporal cadence over a wide range without changing or compromising the opto-mechanical setup. This versatility gives unique possibilities to apply different measurement schemes to a variety of science questions. The ATST is a fully funded US project, with the VTF as the only non-US contribution, and is ready to start construction at the Haleakala summit. The VTF is foreseen as one of the ATST’s firstlight instruments and should become operational in 2018.
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T. J. Kentischer, T. J. Kentischer, W. Schmidt, W. Schmidt, O. von der Lühe, O. von der Lühe, M. Sigwarth, M. Sigwarth, A. Bell, A. Bell, C. Halbgewachs, C. Halbgewachs, A. Fischer, A. Fischer, } "The visible tunable filtergraph for the ATST", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844677 (24 September 2012); doi: 10.1117/12.926789; https://doi.org/10.1117/12.926789

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