Mr. Karl Honnen Profile

Karl Honnen

at Airbus Defence and Space

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Author

Publications (5)

Proceedings Article | 21 September 2012 Paper

The JWST near-infrared spectrograph NIRSpec: status

Pierre Ferruit, Giorgio Bagnasco, Reiner Barho, Stephan Birkmann, Torsten Böker, Guido De Marchi, Bernhard Dorner, Ralf Ehrenwinkler, Massimo Falcolini, Giovanna Giardino, Xavier Gnata, Karl Honnen, Peter Jakobsen, Peter Jensen, Manfred Kolm, Hans-Ulrich Maier, Ralf Maurer, Markus Melf, Peter Mosner, Peter Rumler, Jean-Christophe Salvignol, Marco Sirianni, Paolo Strada, Maurice te Plate, Thomas Wettemann

Proceedings Volume 8442, 84422O (2012) https://doi.org/10.1117/12.925810

KEYWORDS: James Webb Space Telescope, Spectroscopy, Spectral resolution, Spectroscopes, Molybdenum, Sensors, Spectrographs, Astronomical imaging, Galactic astronomy, Near infrared spectroscopy

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Proceedings Article | 5 August 2010 Paper

Status of the NIRSpec instrument

Stephan Birkmann, Torsten Böker, Peter Jakobsen, Guido de Marchi, Marco Sirianni, Giorgio Bagnasco, Peter Jensen, Maurice B. J. te Plate, Peter Rumler, Jean-Christophe Salvignol, Paolo Strada, Manfred Kolm, Xavier Gnata, Karl Honnen, Jess Köhler, Robert Lemke, Marc Maschmann, Markus Melf, Jean-Francois Pittet, Pierre Ferruit, Bernhard Dorner

Proceedings Volume 7731, 77310D (2010) https://doi.org/10.1117/12.858000

KEYWORDS: Calibration, Mirrors, Optical filters, James Webb Space Telescope, Sensors, Staring arrays, Fermium, Frequency modulation, Spectrographs, Spectroscopes

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Proceedings Article | 25 July 2008 Paper

NIRSpec OA development process of SiC components

Karl Honnen, Andreas Kommer, Boris Messerschmidt, Thorsten Wiehe

Proceedings Volume 7018, 70180R (2008) https://doi.org/10.1117/12.788898

KEYWORDS: Silicon carbide, Mirrors, Computer aided design, Interfaces, Optical design, Distortion, Optical components, Optical fabrication, Mechanical engineering, James Webb Space Telescope

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The NIRSpec OA (optical assembly) design largely relies on SiC components. The properties of the SiC material and very tight stability budgets required a dedicated development process. Starting from validation of design principles by breadboard testing, this paper describes the development process up to the SM test of the NIRSpec optical assembly. From breadboard testing the design of the mounting interface was established. The test programme also included gluing processes, torque free mounting of mirrors and verification of stability of friction joints. The basic design rules for the mirrors to cope with distortion of mirror surfaces due to bi-metallic bending effects and flatness deficiencies were derived. A modular design using 3 TMAs (Three Mirror Anastigmats) was followed for the OA. From the overall design, budget allocations and design loads for the TMAs were determined. The detailed design process was then driven by distortion budget allocations derived from optical analysis. Due to stringent stability requirements and high mechanical loads, most elements needed several design iterations to meet the budget allocations. Finally, distortions and displacements of the optical elements under the predictable in-orbit conditions were calculated and used in the optical model. The effects can be partially compensated by adjustment. The budget allocation was then revised to account for non-predictable effects only. An extensive test programme on all level is applied. Proof testing is done on parts level; only for some structural parts the load introduction was too complex to allow full coverage. For those, proof test coverage was completed on TMA level. Structural qualification is done on TMA and OA level. Material properties of the SiC and associated design implications led to an extremely low structural damping. The strong responses found in sinusoidal vibration testing required high effort for test item monitoring, data evaluation and shaker control.

Proceedings Article | 23 July 2008 Paper

JWST NIRSpec mechanical design

Jean-Christophe Salvignol, Karl Honnen, Reiner Barho

Proceedings Volume 7018, 70181Y (2008) https://doi.org/10.1117/12.789858

KEYWORDS: Mirrors, Sensors, Camera shutters, James Webb Space Telescope, Silicon carbide, Space telescopes, Observatories, Optical fabrication, Cameras, Cryogenics

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Proceedings Article | 28 September 2007 Paper

Overview of the near-infrared spectrograph (NIRSpec) instrument on-board the James Webb Space Telescope (JWST)

Giorgio Bagnasco, Manfred Kolm, Pierre Ferruit, Karl Honnen, Jess Koehler, Robert Lemke, Marc Maschmann, Markus Melf, George Noyer, Peter Rumler, Jean-Christophe Salvignol, Paolo Strada, Maurice Te Plate

Proceedings Volume 6692, 66920M (2007) https://doi.org/10.1117/12.735602

KEYWORDS: Mirrors, Staring arrays, James Webb Space Telescope, Calibration, Sensors, Camera shutters, Spectrographs, Silicon carbide, Optical fabrication, Spectroscopy

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