Computer Science – Sound
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21621802g&link_type=abstract
American Astronomical Society, AAS Meeting #216, #218.02; Bulletin of the American Astronomical Society, Vol. 41, p.884
Computer Science
Sound
Scientific paper
Laboratory experiments with dust grains are described in this talk, which will include numerous images and videos from the experiments. In all the experiments, grains are immersed in plasma, and they are electrically charged.
In the first experiment, grains are synthesized under conditions that simulate the outflow of carbon stars. These grains are grown in the gas phase with a carbon vapor. They grow by homogeneous nucleation, accretion, and coagulation. After growth, they are collected and imaged by scanning electron microscopy. These images reveal the grain morphology.
In the second experiment, the structure and dynamics of the liquid or solid-phase centers of a star is simulated in the laboratory using charged grains (precision micron-size spheres) as proxies for protons. These grains are imaged by video microscopy, revealing how they self-organize, arranging themselves spatially in a crystalline-like lattice due to mutual Coulomb repulsion. Video microscopy allows tracking the motion of the microspheres and calculating their velocities. This measurement allows the experimenter to detect waves corresponding to random thermal motion, and from the properties of these waves one can measure the grain's charge.
In the third experiment, sound waves in a cloud of charged dust are observed using high-speed video cameras. The compression and rarefaction of the dust-grain number density are easily observed in the video.
Work supported by NSF and NASA.
No associations
LandOfFree
Imaging Charged Dust in Laboratory Plasmas does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Imaging Charged Dust in Laboratory Plasmas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Imaging Charged Dust in Laboratory Plasmas will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1889651