Dissertation (Metadaten)
Titel:Coulomb balls : structure and confinement of spherical dust crystals in a plasma
 
Autor:Oliver Arp
 
URN:NBN:urn:nbn:de:gbv:8-diss-17628
 
Fakultät:Mathematisch-Naturwissenschaftliche Fakultät
DDC Sachgebiet:530 Physik
 
Datum der mdl. Prüfung:07.06.2006
 
Referent(in):Prof. Dr. A. Piel
Korreferent(en) Korreferentin:Prof. Dr. M. Bonitz, Prof. Dr. A. Melzer
 
Beschreibung:In this thesis the fundamental properties of "Coulomb balls" are explored, a newly discovered form of spherical crystalline complex plasmas. Coulomb balls show an unusual type of structural order in complex plasmas, which is similar to laser-cooled ion clusters in Paul and Penning traps. A detailed analysis of the structural properties is presented. A comparison with molecular dynamics simulations revealed a significant influence of the plasma shielding on the structure. The confinement of Coulomb balls is based on the combination of two principles: First, dielectric walls, were used to shape the plasma profile and to generate a lateral confinement of the enclosed dust cloud. Second, a thermophoretic force is applied to compensate for gravity, which in combination with the plasma induced electric field force establishes a vertical confinement. The proposed functional principle of the trap used for confining Coulomb balls was quantitatively verified by means of measurements and simulations.
 
Schlagworte:Coulomb balls, dusty plasmas, complex plasmas, strongly coupled systems, Coulomb cluster, Yukawa cluster, thermophoresis
 
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