Development of an optical trap for microparticle clouds in dilute gases

Details Development of an optical trap for microparticle clouds in dilute gases Development of an optical trap for microparticle clouds in dilute gases

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004epje...15..287s&link_type=abstract

The European Physical Journal E, Volume 15, Issue 3, November 2004, pp.287-291

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6

Particle-Laden Flows, Control Of Mechanical Systems, Dynamics And Kinematics Of A Particle And A System Of Particles, Heat Flow In Multiphase Systems

Scientific paper

Long-duration experiments with clouds of microparticles are planned for the ICAPS facility on board the International Space Station ISS. The scientific objectives of such experiments are widespread and are ranging from the simulation of aerosol behaviour in Earth's atmosphere to the formation of planets in the early solar system. It is, however, even under microgravity conditions, impossible to sustain a cloud of free-floating, microscopic particles for an extended period of time, due to thermal diffusion and due to unavoidable external accelerations. Therefore, a trap for dust clouds is required which prevents the diffusion of the particles, which provides a source of relative velocities between the dust grains and which can also concentrate the dust to higher number densities that are otherwise not achievable. We are planning to use the photophoretic effect for such a particle trap. First short-duration microgravity experiments on the photophoretic motion of microscopic particles show that such an optical particle-cloud trap is feasible. First tests of a two-dimensional trap were performed in the Bremen drop tower.

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