Abstract
The instabilities of electron cyclotron harmonic waves due to the anisotropy of the electron velocity distribution produced by the injection of the electron beam perpendicular to the magnetic field. A strong spontaneous emission growing up 60 dB above background noise appears near the electron cyclotron harmonics. This instability cannot be launched or sychronized by external modulation. The amplitude is usually not steady in time, but switches off and on in time intervals of 10∼100 µsec. It grows exponentially in time initially, saturates and disappears. This instability can be explained by dispersion relations of electron cyclotron harmonic waves propagating perpendicular to the magnetic field in a plasma with a mixture of ring and Maxwellian electron distributions. The measured growth rate is smaller by 2 to 5 times than the theoretical ones.
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