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Considerations of the effect of space-charge in the magnetron

Published online by Cambridge University Press:  24 October 2008

E. B. Moullin
E. B. Moullin
Affiliation:
Magdalen CollegeOxford
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Extract

When a diode thermionic tube, having cylindrical symmetry, is placed in a magnetic field parallel to its axis it is commonly called a magnetron. If there is a given potential difference between the anode and cathode of the tube, and if the magnetic field is steadily increased, a sharp and pronounced decrease of anode current occurs when the field reaches a certain value. It is easy to show that, if electrons leave without velocity from a cathode of radius b, they will just graze a concentric anode of radius a at potential V when the magnetic field H has the value given by

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 36 , Issue 1 , January 1940 , pp. 94 - 100
Copyright
Copyright © Cambridge Philosophical Society 1940

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References

REFERENCES

(1)Benham, W. E.Proc. Phys. Soc. 47 (1935), 1.CrossRefGoogle Scholar
(2)Pidduck, F. B.Quart. J. Math. 7 (1936), 203.Google Scholar