H. Nomoto

Nonlinear Landau damping of electrostatic waves in an electron beam‐plasma system

The nonlinear Landau damping and growth of electrostatic waves in an electron beam‐plasma system in a magnetic field has been observed experimentally. The space charge wave of the beam decays into the Trivelpiece mode, which is amplified exponentially by increasing the amplitude of the pump wave.

Behaviors of electrostatic ion cyclotron waves excited in ion beam-plasma systems☆

Abstract Experimental results are presented for a behavior of the electrostatic ion cyclotron waves excited in an ion beam-plasma system. This wave appears as forward and backward waves with respect to the propagating component along the magnetic field.

Excitation of electron cyclotron harmonic waves due to helical electron beams in a plasma

Abstract Instabilities of electron cyclotron harmonic waves due to the anisotropy of the velocity distribution of electrons which was produced by the injection of the electron beam perpendicular to the magnetic field have been observed.

Absolute and convective instabilities of electrostatic ion cyclotron waves excited in an ion beam-plasma system

Abstract Experimental results are presented for the observation of the absolute and convective instabilities of the electrostatic ion cyclotron waves excited in an ion beam-plasma system.

Parametric instabilities at unstable electrostatic ion cyclotron waves in an ion beam-plasma system

Abstract We have observed experimentally the parametric excitation of ion acoustic waves and electrostatic ion cyclotron waves by hf electric fields with frequencies of unstable electrostatic ion cyclotron waves. We have verified wave number and frequency selection rules.

Behaviors of absolute instabilities of electrostatic ion cyclotron waves in an ion beam-plasma system

Abstract Experimental results are presented for behaviors of the temporal growth and the threshold beam density of the absolute instability of the electrostatic ion cyclotron waves excited in an ion beam-plasma system, and compared with the linear theory.

Observations of nonlinear Landau damping in an electron beam-plasma system

Abstract The nonlinear Landau damping of space charge waves of an electron beam into Trivelpiece modes by nonlinear interaction with plasma electrons has been observed experimentally in an electron beam-plasma system.

Electron cyclotron damping of Bernstein waves in plasmas

Abstract Experimental results are presented which show the electron cyclotron damping of the electrostatic cyclotron harmonic waves (Bernstein waves) propagating obliquely to the static magnetic field.

Observation of explosive instability in an electron beam-plasma system

Abstract We have observed experimentally the explosive instability of the slow space charge wave of the electron beam and the electrostatic electron cyclotron harmonic wave due to nonlinear wave-particle interaction. These waves interact nonlinearly with the electron beam and grow simultaneously.

Time behaviour of electron cyclotron harmonic waves excited by helical electron beams in a plasma

Abstract Time behaviour of instabilities of electron cyclotron harmonic waves due to the anisotropy of the velocity distribution of electrons has been investigated. Measured growth rate was compared with the calculated ones.