Observation of Self-Interaction of Bernstein Waves by Nonlinear Landau Damping

Abstract

It is confirmed experimentally that the self-interaction of electron Bernstein waves occurs by means of nonlinear cyclotron (Landau) damping. This wave-particle interaction occurs in a relatively broad frequency range: 1.46 < co/co c < 1.54, 1.60 < (o/co c < 1.75. The virtual wave is observed most strongly at the half-harmonic electron cyclotron frequency near co/(o c = 1.5. Although this self-interaction always occurs for k\\v t /co c ;S0.1, the virtual wave cannot be detected for k\\ut/co c^0 A5.

Evidence of Nonlinear Interactions Between Magnetospheric Electron Cyclotron Harmonic Waves

“…The two secondary waves violating the linear dispersion relations may be “virtual” waves mentioned above. Previous plasma experiments (Ellis & Porkolab, 1968; Sugawa, 1988) have detected “virtual” waves and indicated that they are limited in a spatially localized region. The secondary “virtual” waves here might only be detectable at the local interaction region of the intense ECH waves, since they would be heavily damped without the parent wave drivers.…”

Electron beam acceleration and potential formation induced by the Compton scattering of extraordinary waves

“…is generated by the dynamo effect of v (4) In (6)-(9), (12)- (14) and (17), the numerical factors are corrected because the errors in numerical factors in the higher-order kinetic equations exist in the appendix of [11]. It is noted that d/dt ≈ γ NL in (15)…”

“…Nonlinear wave-particle scattering induced by nonlinear Landau and cyclotron damping of electromagnetic and electrostatic waves in an unmagnetized or magnetized plasma has attracted a great deal of attention in theoretical [1][2][3][4][5][6][7][8][9][10][11] and experimental [12][13][14][15][16] research of plasma physics over recent years. This nonlinear phenomenon is one of the fundamental mechanisms for anomalous resistivity, anomalous transport, plasma heating and acceleration, and plasma current drive in fusion plasmas, as well as space plasmas.…”

“…This nonlinear phenomenon is one of the fundamental mechanisms for anomalous resistivity, anomalous transport, plasma heating and acceleration, and plasma current drive in fusion plasmas, as well as space plasmas. Recently, plasma heating due to nonlinear Landau or cyclotron damping of electrostatic waves has been investigated theoretically [3,4] and experimentally [12][13][14][15][16]. In particular, it has been shown by the present author and co-workers experimentally and theoretically that a strong radial electric field and a radial transport of heated plasma electrons are generated by electrostatic waves excited by nonlinear Landau damping in an electron-beam-plasma system, and they can maintain the large and abrupt radial inhomogeneity of electron temperature and density [15][16][17].…”

Relativistic electron beam acceleration by Compton scattering of extraordinary waves

“…This nonlinear phenomenon is one of the fundamental mechanisms for energy and momentum transfers between waves and particles, and has received a great deal of interest in theoretical [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] and experimental research. [16][17][18][19][20][21] Nonlinear scattering of intense electromagnetic and electrostatic waves in laser fusion, tokamak, ionospheric modification experiments, and pulsar electrodynamics is related to kinetic effects such as plasma heating and acceleration and transport phenomena, and should be studied on the basis of the general and exact theory, including the relativistic effects.…”