| 1. |
- Berkefeld, Thomas, et al.
(författare)
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Site-seeing measurements for the European Solar Telescope
- 2010
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Ingår i: Ground-based and Airborne Telescopes III. ; , s. 77334I-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)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.
(författare)
-
Wavefront sensing and wavefront reconstruction for the 4m European Solar Telescope EST
- 2010
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Ingår i: Adaptive Optics Systems II. - : SPIE. ; , s. 77362J-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)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. |
- Koopmann, Rudolf, et al.
(författare)
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In vivo protein crystallization opens new routes in structural biology
- 2012
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Ingår i: Nature Methods. - : Springer Science and Business Media LLC. - 1548-7091 .- 1548-7105. ; 9:3, s. 259-262
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Tidskriftsartikel (refereegranskat)abstract
- Protein crystallization in cells has been observed several times in nature. However, owing to their small size these crystals have not yet been used for X-ray crystallographic analysis. We prepared nano-sized in vivo–grown crystals of Trypanosoma brucei enzymes and applied the emerging method of free-electron laser-based serial femtosecond crystallography to record interpretable diffraction data. This combined approach will open new opportunities in structural systems biology.
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| 4. |
- Soltau, Dirk, et al.
(författare)
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Adaptive optics and MCAO for the 4-m European Solar Telescope EST
- 2010
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Ingår i: Adaptive Optics Systems II. - : SPIE. ; , s. 77360U-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)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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