Stabilization and steering of a parabolic laser thermal thruster with an ignition device

High energy pulses of a CO 2 laser are focused in a parabolic mirror yielding to a laser-supported detonation. The generated thrust acting on the reflector as a bell nozzle is studied in multiple pulse free flight experiments with respect to axial, lateral and angular momentum coupling. The employme...

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Bibliographic Details
Published in:Acta astronautica 2009-12, Vol.65 (11), p.1599-1615
Main Authors: Scharring, Stefan, Hoffmann, Daniela, Eckel, Hans-Albert, Röser, Hans-Peter
Format: Article
Language:English
Subjects:
Beam riding
Impulse coupling
Laser propulsion
Lightcraft
Parabolic thruster
Steering
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Summary:High energy pulses of a CO 2 laser are focused in a parabolic mirror yielding to a laser-supported detonation. The generated thrust acting on the reflector as a bell nozzle is studied in multiple pulse free flight experiments with respect to axial, lateral and angular momentum coupling. The employment of an ignition pin on the reflector's axis of symmetry lowering the ignition threshold by several orders of magnitude is found to provide for a reproducible detonation process. The axial momentum coupling of each pulse is analyzed with respect to initial lateral offset and tilt during the flight. High speed analyses of recorded flights indicate that lateral momentum components occur re-centering the thruster on the beam. Thrust vector steering can be realized by tilt of the ignition pin inside the thruster, thus shifting the detonation. A design model of a laser-driven rocket including a remotely accessible steering gear was developed and tested successfully.
ISSN:0094-5765
1879-2030
DOI:10.1016/j.actaastro.2009.04.007