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The cosmic dust aggregation experiment CODAG

Jürgen Blum-+, Gerhard Wurm-+, Torsten Poppe-+, Sascha Kempf++, Björn Fiethe§, Michaela Giel||, Peter Offterdinger||, Dietmar Neuhaus, Martin Rott+, Frank Giovane* and Bo Gustafson#

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For the simulation of the first stage of preplanetary dust aggregation, we developed the cosmic dust aggregation experiment (CODAG). With CODAG, we intend to study the aggregational behaviour of a cloud of micron-sized dust particles due to Brownian motion of the grains. For a realistic simulation of the processes in the young solar system, the dust grains have to be dispersed in a rarefied gas so that mutual collisions are ballistic. Fast sedimentation of the grains in the Earth's gravitational field leads to unrealistic collision velocities and to a rapid loss of particles to the container walls. Therefore, CODAG was designed to work in a microgravity environment. In this paper, we present an overview of the experimental design of CODAG which was recently flown in a Get Away Special container during the STS-95 mission.


PACS

96.10.+i General, solar nebula, and cosmogony

91.10.Qm Harmonics of the gravity potential field

MSC

60J65 Brownian motion (See also 58J65)

Subjects

Environmental and Earth science

Astrophysics and astroparticles

Dates

Issue 10 (October 1999)

Received 16 February 1999, accepted for publication 7 July 1999, in final form 7 July 1999



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