| 1. |
- Berkefeld, Thomas, et al.
(author)
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Site-seeing measurements for the European Solar Telescope
- 2010
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In: Ground-based and Airborne Telescopes III. ; , s. 77334I-
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Conference paper (other academic/artistic)abstract
- Seeing measurements are crucial for the optimum design of (multi-conjugate) adaptive optics systems operating at solar telescopes. For the design study of the 4-meter European Solar Telescope, to be located in the Canary Islands, several instruments have been constructed and operated, at the Observatorio del Roque de los Muchachos (La Palma) and at the Observatorio del Teide (Tenerife), to measure the properties of the ground layer and medium-high altitude turbulence. Several units of short (42.34 cm) and two long (323.06 cm) scintillometer bars are, or are to be, installed at both observatories. In addition to them, two wide-field wavefront sensors will be attached to the optical beams of the Swedish tower, on La Palma, and of the German VTT, on Tenerife, simultaneously used with the normal operation of the telescopes. These wavefront sensors are of Shack-Hartmann type with ~1 arcminute field of view. In this contribution, the instruments setup and their performance are described.
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| 2. |
- Berkefeld, Thomas, et al.
(author)
-
Wavefront sensing and wavefront reconstruction for the 4m European Solar Telescope EST
- 2010
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In: Adaptive Optics Systems II. - : SPIE. ; , s. 77362J-
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Conference paper (other academic/artistic)abstract
- We give an overview of the Adaptive Optics (AO) and Multi-conjugate Adaptive Optics (MCAO) system of the planned 4m European Solar Telescope (EST). The parameter space and the problems of solar MCAO working in the visible are explained. The wavefront reconstruction schemes presently being considered are explained. First estimates of the expected MCAO performance for varying parameter sets are given.
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| 3. |
- Enmark, Anita, et al.
(author)
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Simulation of adaptive optics for the Vacuum Tower Telescope
- 2006
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In: Experimental Astronomy. - : Springer Science and Business Media LLC. - 0922-6435 .- 1572-9508. ; 21:2, s. 87-99
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Journal article (peer-reviewed)abstract
- A simulation model of the adaptive optics of the German Vacuum Tower Telescope (VTT), Observatorio del Teide, Tenerifes presented. The model uses modules from the integrated model of the Euro50 extremely large telescope, and includes submodels of a Shack-Hartmann wavefront sensor, a de-formable mirror, a tip-tilt mirror, high-voltage amplifier low-pass filters, a reconstructor and a controller. We investigate the impact on the closed loop bandwidth of changes in controller configuration and certain system parameters, such as low pass filter bandwidth and camera integration and readout time. Control strategies were tested on simple models before implementation on the full VTT model. Using the models, different control strategies are compared.
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| 4. |
- Soltau, Dirk, et al.
(author)
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Adaptive optics and MCAO for the 4-m European Solar Telescope EST
- 2010
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In: Adaptive Optics Systems II. - : SPIE. ; , s. 77360U-
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Conference paper (other academic/artistic)abstract
- A consortium of more than 20 European solar physics institution from 15 different countries is conducting a design study for a 4 m class solar telescope which shall be situated at the Canary Islands. In this paper we introduce the AO and MCAO design concept for EST. A ground layer deformable mirror is combined with an arrangement of four deformable layer mirrors. A combination of Shack-Hartmann wave front sensors with wide and narrow fields of view is used to control the system and to achieve a corrected field of view of one arcmin.
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