Fundamental physics within complex plasmas.

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dc.contributor.advisor Hyde, Truell Wayne. Douglass, Angela Michelle. 2012-08
dc.identifier.citation Douglass, A., Land, V. , Matthews, L., and Hyde, T. "Dust particle charge in plasma with ion flow and electron depletion near plasma boundaries." Physics of Plasmas 18, 083706 (2011). en_US
dc.identifier.citation Douglass, A., Land, V., Qiao, K., Matthews, L., and Hyde, T. "Determination of the levitation limits of dust particles within the sheath in complex plasma experiments." Physics of Plasmas 19, 013707 (2012). en_US
dc.identifier.citation Hartmann, P., Douglass, A., Reyes, J. C., Matthews, L. S., Hyde, T. W., Kovács, A., and Donko, Z. "Crystallization Dynamics of a Single Layer Complex Plasma." Physical Review Letters 105, 115004 (2010). en_US
dc.description.abstract In this work, both experimental and numerical methods are used to investigate several of the fundamental processes and assumptions commonly found in an earth-based radio-frequency (RF) complex plasma discharge. First the manner in which the dust particle charge varies with the particle’s height above the powered electrode is investigated. Knowledge of the dust particle charge is required to understand nearly all complex plasma experiments since it affects the dust particle’s levitation height and particle-particle interactions. A fluid model which includes effects due to ion flow and electron depletion (which are significant dust charging effects within the sheath where the particles levitate) is employed to determine the plasma parameters required to calculate the dust particle charge. Second, the levitation limits of the dust particles and the structure of the sheath are investigated. The CASPER GEC RF reference cell is used to perform two experiments: one to measure the dust levitation height as a function of applied RF voltage and one to determine the electric force profile. The fluid model is then used to interpret the experimental results. This study provides a better understanding of the sheath structure, particle behavior within the sheath, and provides a new, in situ experimental method for locating the approximate height of the sheath edge in any dusty plasma system. Finally, both molecular dynamics (MD) simulations and an experiment are employed to determine the physical processes that a complex plasma system goes through as it rapidly transitions from a liquid to solid state. en_US
dc.publisher en
dc.rights Baylor University theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. Contact for inquiries about permission. en_US
dc.subject Complex plasmas en_US
dc.title Fundamental physics within complex plasmas. en_US
dc.type Thesis en_US Ph.D. en_US
dc.rights.accessrights Worldwide access en_US
dc.contributor.department Physics. en_US
dc.contributor.schools Baylor University. Dept. of Physics. en_US

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