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  • 1.
    Andersen, Torben
    et al.
    Lunds universitet.
    Enmark, Anita
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
    Integrated Modeling of Telescopes2011Book (Other academic)
  • 2.
    Enmark, Anita
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
    Andersen, Torben
    Lund Observatory.
    Owner-Petersen, Mette
    Lund Observatory.
    Chakraborty, Rijuparna
    Collège de France.
    Labeyrie, Antoine
    Collège de France.
    Integrated model of the Carlina Telescope2011In: Symposium on Integrated Modeling of Complex Optomechanical Systems: 15-17 August 2011, Kiruna, Sweden / [ed] Torben Andersen; Anita Enmark, 2011Conference paper (Refereed)
    Abstract [en]

    The Carlina hypertelescope is a planned sparse aperture 100 m telescope with pupil densification. The telescope has a spherical primary with segments located in a valley between mountains, and additional optical elements in a gondola suspended in eight cables some 100 m above the primary mirror. The resolution is about 1.2×10-3 arcsec. It is imperative that the position and attitude of the gondola be maintained within tight tolerances during observation and star tracking. The present design has servo-controlled winches on the ground for control of the gondola via the cables. An integrated model of the system, including optics, cables, gondola, position and attitude control system, and wind disturbances has been set up. The structural and control models are linear. Calculations in the frequency domain and simulations in the time domain show that the performance of the telescope with the present design seems adequate for short exposures. However, for long-exposure operation, the gondola stability should be improved by about two orders of magnitude. Recommendations are given on possible approaches for performance improvement.

  • 3.
    Gräslund, Astrid
    et al.
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Ehrenberg, Anders
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Tyrosyl radical, diiron center and enzyme mechanism in ribonucleotide reductase2007In: Appl. Magn. Reson., no 31, p. 447-455Article in journal (Refereed)
1 - 3 of 3
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