CASPER - Dr. Peter Hartman
|Date||October 25, 2013|
|Time||2:30 - 3:30 pm|
|Description||Realizing Extreme Magnetic Fields with Rotating Dusty Plasmas|
Dusty plasmas are routinely used to study classical many-body phenomena in both the liquid and solid phases. Processes such as wave propagation, diffusion, heat conductivity, shear, crystal growht, etc., already have been successfully investigated on the particl level. Currently, much effort is applied toward the realization of magnetized dusty plasmas. Preliminary studies show that the (often disregarded) background gas discharge plasma reacts to the external magnetic field well before the dust particles themselves appear to be affected. A recent theoretical study proposed to use the Larmor theorem, i.e., the equivalence of teh magnetic Lorentz force and the Coriolis force (acting on moving objects when they are viewed in a rotating frame of reference), to devise a means of conducting rotating experiments that does not require the use of huge magnets. We have constructed and experimental rotating dusty plasma device that apears to provide the means to experimentally emulate extreme, highly effective magnetic fields by means of the Coriolis force. Using the device, we have measured current fluctuation spectra for various rotation rates, with some yielding a magnetic induction equivalent of up to 3200 Tesla. We also have identified the onset of magnetoplasmon-equivalent dispersion in rotating macroscopic two-dimensional single-layer dusty plasma systems.
|Publisher||Baylor Sciences Building|
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