flinders university of south australia leon mitchell nathan prior university of sydney brian james...
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Flinders University of South AustraliaFlinders University of South AustraliaLeon MitchellLeon MitchellNathan PriorNathan Prior
University of SydneyUniversity of SydneyBrian JamesBrian James
Alex SamarianAlex SamarianFelix CheungFelix Cheung
Flinders University of South AustraliaFlinders University of South AustraliaLeon MitchellLeon MitchellNathan PriorNathan Prior
University of SydneyUniversity of SydneyBrian JamesBrian James
Alex SamarianAlex SamarianFelix CheungFelix Cheung
XXXX____Program
Introduction
Experimental setup
Results and discussion on the rotation of various dust plasma crystal configurations:
Large
Small
Annular
Future research
Summary of experimental results
Conclusion
XXXX____What is a Dust Plasma Crystal?
A well ordered and stable array of highly negatively charged dust particles suspended in a plasma
Relatively new scientific field with many interesting properties discovered
Theoretical predictionIkezi (1986)
Experimental confirmationLin I et el (1994), Thomas H et el (1994)
Recent interests include:Dynamical behavior (oscillations, waves, convective motion)
Solid State (melting, crystal growth, structural packing)
XXXX____The Basic Ingredients
Melamine formaldehyde polymerSpherical, micron-sized and mono-dispersed
Electrons:Small, light and fast moving
Frequent collisions with particles
Ions:Big, heavy and slow moving
Minimal interaction with particles
Neutrals:Damping in system
Argon plasmaArgon plasma
Dust particlesDust particles
XXXX____
GravitationGravitational Forceal Force
Electrostatic Electrostatic ForceForce
Dust Plasma Crystal Production
Produce an argon plasmaDisperse particles with shakerParticles will then:
Charge negativelyFall under gravityBalance at sheath-plasma interface
Mg = eZEs
Arrange to form crystal structure
XXXX____Experimental Setup
Observationwindow
Teflon rod
Shaker
RF coil
Viewing area
Quartz window
Turbo-molecular vacuum pump
Electrode and Electrode and coil on mountcoil on mount