Parametric instability in plasma
WebAug 28, 2008 · Parametric instabilities in the presence of sinusoidal plasma density modulation are considered analytically and by numerical integration of the coupled mode … WebA linear stage of thermal parametric instability in an inhomogeneous plasma is considered. Expressions are obtained for the threshold fields and instability growth rates. The threshold powers of transmitters used for instability excitation in the ionospheric F …
Parametric instability in plasma
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WebA purely growing instability characterized by a four-wave interaction has been analysed in a uniform, magnetized plasma. Up-shifted and down-shifted upper-hybrid waves and a non-oscillatory mode can be excited by a pump wave of ordinary rather than extraordinary polarization in the case of ionospheric heating. WebLarge-amplitude Alfvén waves at magnetohydrodynamic scales are unstable to parametric decay instability (PDI). In a low-beta plasma (when the thermal pressure is smaller than the magnetic pressure), PDI leads to the decay of the ‘pump’ wave into a forward ion-acoustic wave and a lower-frequency backward Alfvén wave (Galeev & Oraevskii ...
WebApr 6, 2024 · instability for this process is localized in space near the quarter-critical-density poinp(x)^w0.t 2u This instability has been obtained earlier by Drake and Lee [9], who also started with a fourth-order set but reduced it to second order by making a non-propagating approximation for the plasma waves. Our calculation shows that this approxi- WebAug 11, 2024 · Little research on in-plane dynamic instability of deep fixed arches has been reported in the literature. This paper is concerned with experimental and analytical investigations for in-plane dynamic instability of fixed circular arches with rise-to-span ratios 1/8–1/2 under a central periodic load owing to parametric resonance.
WebAug 18, 2010 · A theoretical study of the parametric decay instability as occurring in electron Bernstein wave heating experiments and leading to anomalous reflection is performed. ... A study is made of the influence of large-scale plasma turbulence on the results from a diagnostic method that is based on enhanced scattering of microwaves … WebMar 10, 2014 · The phenomenon of spectral broadening was interpreted as effect of the non-linear plasma-wave phenomenon of parametric instability (PI) [11, 12]. This phenomenon is produced by the coupled LH power (the so-called pump wave), is driven by low frequency density fluctuations of thermal background, and produces LH sidebands shifted by a …
WebAug 31, 2024 · Parametric instability, its convective and absolute nature and consequences, in laser plasma interaction is reviewed . Recent progress in understanding the sudden …
WebMar 13, 2009 · We find, in addition to the well-known decay and modulational instabilities, that at oblique and perpendicular propagation there is another parametric instability, namely the filamentation instability, which is characterized by a broad band-width in wavenumber and which satisfies the condition Re (ω) ≪ γ. tauranga window cleanersWebPARAMETRIC INSTABILITY The linear phase of the parametric instability of a plasma located in a uniform field has been thoroughly investigated in a number of papers [1-3] • Here we state briefly the pertinent results in hydrodynamic approx imation, i.e., in the framework of the Eqs. (10). The zero-order solution of Eq. the castello resort เกาะล้าน pantipWebUsing an electron magnetohydrodynamic model, we investigate the parametric decay among three whistler waves. A nonlinear equation to describe both linear and nonlinear … tauranga windscreens \u0026 glasstauranga wellington flightsWebNov 22, 2024 · Parametric decay instability (PDI) in magnetically confined hot plasmas was the core topic of my PhD. PDI is a nonlinear three-wave interaction between a high-power “pump” wave injected in a... tauranga wedding dress shopsWebThe possible excitation of parametric decay instabilities in the scrape-off layer of tokamak plasmas (SOL, namely the shadow of the limiter in a limiter defined plasma, or outside the … the cast for 1883WebThis feature, known as the decay line, is produced by the parametric decay instability (e.g. Hanssen et al., 1992). The UHF plasma line spectra in Figure 2 show both a decay line and … tauranga wind forecast