Nonlinear Development of the Beam-Cyclotron Instability

Lampe, Mártin; Manheimer, W. M.; McBride, J. B.; Orens, Joseph H.; Shanny, R.; Sudan, R. N.

doi:10.1103/physrevlett.26.1221

Cited by 98 publications

(68 citation statements)

References 6 publications

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“…The instability is a result of reactive coupling of the electron (Doppler shifted) upper hybrid mode (ω − kv 0 ) 2 = ω 2 pe + Ω 2 ce with the short wavelength ion oscillations ω 2 = ω 2 pi . In the long wavelength low frequency limit, (ω, kv 0 ) < Ω ce , equation (6) describes the lower-hybrid modes, ω 2 LH = Ω ci Ω ce . The contribution of higher m > 1 harmonics (which are absent for T e = 0) grows with electron temperature and has the maximum at shorter wavelengths k 2 ρ 2 e 1 due to the exp −k 2 ρ 2 e I m k 2 ρ 2 e factors.…”

Section: Linear Features Of the Electron Cyclotron Drift-instabilitymentioning

confidence: 99%

Evolution of the electron cyclotron drift instability in two-dimensions

et al. 2018

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The Electron Cyclotron Drift Instability (ECDI) driven by the electron E × B drift in partially magnetized plasmas is investigated with highly resolved particle-in-cell simulations. The emphasis is on two-dimensional effects involving the parallel dynamics along the magnetic field in a finite length plasma with dielectric walls. It is found that the instability develops as a sequence of growing cyclotron harmonics demonstrating wave breaking and complex nonlinear interactions, being particularly pronounced in ion density fluctuations at short wavelengths. At the same time, nonlinear evolution of fluctuations of the ion and electron density, as well as the anomalous electron current, shows cascade toward long wavelengths. Tendency to generate long wavelength components is most clearly observed in the spectra of the electron density and the anomalous current fluctuations. An intense but slowly growing mode with a distinct eigen-mode structure along the magnetic field develops at a later nonlinear stage enhancing the tendency toward long wavelength condensation. The latter mode having a finite wavelength along the magnetic field is identified as the Modified Two-Stream Instability (MTSI). It is shown that the MTSI mode results in strong parallel heating of electrons.

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Section: Linear Features Of the Electron Cyclotron Drift-instabilitymentioning

confidence: 99%

Evolution of the electron cyclotron drift instability in two-dimensions

et al. 2018

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“…It has been studied in the past, in the context of collisionless shocks and 0-pinch machines, to account for anomalous cross-field particle transport [1][2][3]. In recent years, theoretical analyses and numerical simulations have revealed that the ECDI also plays a role in enhancing electron current in the Hall thruster plasma [4][5][6], where it is associated with a broad ening of the electron energy distribution functions parallel and perpendicular to the applied magnetic field.…”

mentioning

confidence: 99%

Modulated Electron Cyclotron Drift Instability in a High-Power Pulsed Magnetron Discharge

Tsikata

Minea

2015

Phys. Rev. Lett.

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The electron cyclotron drift instability, implicated in electron heating and anomalous transport, is detected in the plasma of a planar magnetron. Electron density fluctuations associated with the mode are identified via an adapted coherent Thomson scattering diagnostic, under direct current and high-power pulsed magnetron operation. Time-resolved analysis of the mode amplitude reveals that the instability, found at MHz frequencies and millimeter scales, also exhibits a kHz-scale modulation consistent with the observation of larger-scale plasma density nonuniformities, such as the rotating spoke. Sharply collimated axial fluctuations observed at the magnetron axis are consistent with the presence of escaping electrons in a region where the magnetic and electric fields are antiparallel. These results distinguish aspects of magnetron physics from other plasma sources of similar geometry, such as the Hall thruster, and broaden the scope of instabilities which may be considered to dictate magnetron plasma features.

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“…The beam cyclotron instability (also known as the electron cyclotron drift instability) (Wong, 1970;Lampe et al, 1972 …”

Section: Beam Cyclotron Instabilitymentioning

confidence: 99%

“…It is a fluid-like (or hydro- The anomalous ion-ion collision frequency associated with this instability is Van < 10-1th (Lampe et al, 1975).…”

Section: Magnetized Ion-ion Instabilitymentioning

confidence: 99%