Abstract
While the widely used electrodynamic quadrupole traps are based on the dynamic stabilization around a field minimum, we demonstrate here the trapping of charged particles close to a maximum of the electric field. In the experiment charged steel spheres are trapped in the monopole potential of a tip electrode using a combination of static and alternating voltages. As a periodically driven nonlinear oscillator this system might show chaotic dynamics. A period doubling bifurcation was observed experimentally.
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