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Investigation of two oscillation types in a beam generated plasma

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Abstract

High frequency oscillations are observed in a beam generated plasma subjected to an axial uniform magnetic field. The oscillation frequency is measured as a function of the cyclotron frequency. The system is in a condition just below total glow.

The oscillations are classified by comparing the experimental results with theoretical analyses of beam plasma systems in literature. Two types of oscillation are found. They result from (A) the interaction between the forward plasma wave and the slow space charge wave of the beam and (B) the interaction between the backward plasma wave and the slow space charge wave of the beam. The oscillation frequency of type A is practically independent of the cyclotron frequency, whereas the frequency of oscillation B increases linearly with it. For type A oscillations to occur a minimum value of the cyclotron frequency is required.

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Abbreviations

β :

phase constant

B 0 :

static axial magnetic induction

e :

electron charge

f c :

cyclotron frequency

f cc :

critical cyclotron frequency

f h :

hybrid frequency

f osc :

oscillation frequency

f p :

plasma frequency

I b :

beam current

I c :

collector current

m :

electron mass

N e :

electron density per unit beam length

ρ b :

beam charge density

ρ p :

plasma charge density

r p :

plasma radius

S :

beam pervenance

V ak :

anode-cathode potential

V b :

beam voltage

Units:

SI-units are employed

References

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Author notes

  1. F. J. M. Frankort

    Present address: Philips' Research Laboratories, N.V. Philips' Gloeilampenfabrieken, Eindhoven, The Netherlands

Authors and Affiliations

  1. Technological University, Eindhoven, The Netherlands

    F. J. M. Frankort & J. J. M. Kwaspen

Authors
  1. F. J. M. Frankort
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  2. J. J. M. Kwaspen
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Frankort, F.J.M., Kwaspen, J.J.M. Investigation of two oscillation types in a beam generated plasma. Appl. sci. Res. 21, 442–451 (1969). https://doi.org/10.1007/BF00411626

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  • DOI: https://doi.org/10.1007/BF00411626

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