Mode Conversion and Period Doubling at Plasma-$\beta$ Unity in an Alfv\'en-Wave Experiment with Liquid Rubidium
F. Stefani, J. Forbriger, Th. Gundrum, T. Herrmannsd\"orfer, J., Wosnitza
TL;DR
This study investigates Alfvén-wave behavior in liquid rubidium under extremely high magnetic fields, revealing period doubling at plasma-$eta$ unity due to parametric resonance between wave modes.
Contribution
It demonstrates the first experimental observation of period doubling and parametric resonance at plasma-$eta$ unity in a liquid metal Alfvén-wave setup.
Findings
Period doubling observed at 54 T magnetic field.
Parametric resonance between magnetosonic and Alfvén waves confirmed.
Wave behavior changes distinctly at plasma-$eta$ unity.
Abstract
We report Alfv\'en-wave experiments with liquid rubidium at the Dresden High Magnetic Field Laboratory (HLD). Reaching up to 63 T, the pulsed magnetic field exceeds the critical value of 54 T at which the Alfv\'en speed becomes equal to the sound speed (plasma- unity). At this threshold we observe a period doubling of an applied 8 kHz CW excitation, a clear footprint for a parametric resonance between magnetosonic waves and Alfv\'en waves.
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