Letter | Published:

Discharges in Hydrogen at the Ion Cyclotron Frequency

Naturevolume 180pages14681469 (1957) | Download Citation



ATTEMPTS to find the optimum conditions for producing a highly ionized plasma in hydrogen have recently been described1. A microwave source was used, and the discharge tube was immersed in a magnetic field. It was found that a more efficient transfer of energy from the micro-wave field to the plasma took place when the operating frequency equalled the electron cyclotron frequency. We have carried out preliminary experiments to discover if such a selective absorption occurred when the applied frequency was equal to the ion cyclotron frequency. This frequency is given by F = eH/2πmc, where H is the magnetic field strength and m is the ionic mass.

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  1. 1

    Buchsbaum, S. J., and Gordon, E., Quarterly Progress Report, Massachusetts Institute of Technology Res. Lab. of Electronics (Oct. 15, 1956).

  2. 2

    Walsh, D., and Shearman, P. M., J. Sci. Instr., 34, 161 (1957).

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  1. Department of Electrical Engineering, Imperial College of Science and Technology, London, S.W.7.

    • A. W. BRIGHT
    •  & K. RAMANATHAN


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