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A Method for Driving an Oscillator at a Quasi-Uniform Velocity

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Abstract

We describe a simple way to drive an actuator, comprising a superconducting coil moving in a static magnetic field, at a quasi-uniform velocity. The main objective is to avoid oscillations in this system with low damping, as they undermine the uniformity of the velocity. The method consists in calculating the force that should be exerted on the coil from the equation of motion and programming a waveform generator to produce the corresponding current through the coil. The method was tested on a device towing a grid through a closely fitted channel filled with superfluid 4He at temperatures below 100 mK. The motion of the grid over the distance of 4.3 cm at 10 cm/s resulted in oscillations of less than 50 μm in amplitude (or less than 1 mm/s in terms of velocity). The method can be applied to any oscillator.

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Acknowledgements

The author would like to thank M. Fear, P. Walmsley and S. Fisher for useful discussions of the design of the device. This work was supported through the Materials World Network program by the Engineering and Physical Sciences Research Council [Grant No. EP/H04762X/1].

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Authors and Affiliations

  1. Department of Physics, Lancaster University, Lancaster, LA1 4YB, UK

    D. E. Zmeev

  2. School of Physics and Astronomy, The University of Manchester, Schuster Building, Oxford Road, M13 9PL, Manchester, UK

    D. E. Zmeev

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  1. D. E. Zmeev
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Correspondence to D. E. Zmeev.

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Zmeev, D.E. A Method for Driving an Oscillator at a Quasi-Uniform Velocity. J Low Temp Phys 175, 480–485 (2014). https://doi.org/10.1007/s10909-013-0942-2

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  • DOI: https://doi.org/10.1007/s10909-013-0942-2

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