On mechanical motion damping of a magnetically trapped diamagnetic particle |
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Institution: | 1. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USA;2. Faculty of Physics, Moscow State University, Moscow 119991, Russia;3. Quantum Technology Centre, M.V. Lomonosov Moscow State University, Moscow 119991, Russia |
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Abstract: | We discuss eddy-current-induced limitations of the attenuation of mechanical motion of a diamagnetic particle trapped by an inhomogeneous magnetic field in the Earth's gravitational potential. We show that the mechanical frequency of the particle oscillation is independent on the particle properties and is proportional to the free fall acceleration constant, similarly to the classical mechanical pendulum. The frequency can be used to measure the gravity field. The eddy-current induced attenuation constant does not depend on the mass of the particle and reduces with the particle volume. The quality factor of the mechanical motion can be as high as 109 and is comparable with the attenuation due to interaction of the particle with incompletely evacuated air. A possibility of usage of the particle as a quantum mechanical system is discussed. |
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Keywords: | Microparticle trapping Magnetic trap Eddy current |
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