Dusty Plasmas in the Laboratory and Space

Details Dusty Plasmas in the Laboratory and Space Dusty Plasmas in the Laboratory and Space

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..apr.r6001m&link_type=abstract

American Physical Society, April Meeting, 2003, April 5-8, 2003 Philadelphia, Pennsylvania, MEETING ID: APR03, abstract #R6.001

Physics

Scientific paper

Much of the solid matter in the universe is in the form of dust particles (nanometer to micrometer-sized) which coexist with the ionized gaseous component. This state of matter, which is known as a dusty plasma, occurs in a wide variety of environments both cosmic and terrestrial, ranging from planetary ring systems, cometary magnetospheres, the interstellar medium, planetary nebulae as well as in noctilucent clouds in the earth's mesospheric region. Dust is also an unwanted component of plasmas used for semiconductor manufacturing, fusion plasmas and in plasmas near orbiting spacecraft. The dust acquires a net electrical charge by collecting electrons and ions from the plasma. In an ultraviolet light environment photoelectron emission will also affect the grain charge. This talk will focus on the basic physics of dusty plasmas with particular emphasis on laboratory results. Examples of dusty plasmas in the space environment and in the laboratory will be presented and the physics of the dust charging process will be discussed. Methods used to produce dusty plasmas in the laboratory will be reviewed. One of the novel features of a dusty plasma is the fact that the dynamics of the dust can be studied by analyzing images of the scattered light from the dust. This technique has allowed us to study the dispersion properties of very low frequency (few Hz) acoustic waves, associated with the dynamics of the charged dust particles, that are naturally excited in the dusty plasma. Examples of video images of the behavior of dusty plasmas and the dynamics of individual dust grains will be presented.

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