Parametric decay instability of an inhomogeneous plasma in a frequency-modulated pump wave

Arkhipenko, V. I.; Budnikov, V.N.; Gusakov, E. Z.; Kapanik, A. K.; Pisarev, V.; Simonchik, L. V.

doi:10.1134/1.952855

Cited by 9 publications

(26 citation statements)

References 5 publications

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“…One can see that maximal satellite amplitude grows with correlation time that in quality agreement with numerical modelling results, where PDI saturation level rises with τ c . The similar picture was observed earlier in [4] for harmonic modulation in range of small modulation frequency.…”

Section: Resultssupporting

confidence: 73%

“…However the analysis carried out in inhomogeneous plasma model for stochastic pump phase modulation [3] show high stability and insensitivity of convective amplification coefficient to modulation. Such stability was recently confirmed for absolute PDI in experiment [4] and shown in numerical computations also [5]. It should be mentioned that theoretical conclusion [3] and experimental results [4] were obtained for fast pump phase modulation, in particular, for modulation quicker than the transient time of the slow daughter wave in the decay region.…”

Section: Introductionmentioning

confidence: 69%

“…Such stability was recently confirmed for absolute PDI in experiment [4] and shown in numerical computations also [5]. It should be mentioned that theoretical conclusion [3] and experimental results [4] were obtained for fast pump phase modulation, in particular, for modulation quicker than the transient time of the slow daughter wave in the decay region. It should be stressed that resonant enhancement of the convective amplification coefficient is possible not only for linear or harmonic pump frequency modulation, but also for stochastic modulation, as was shown in the numerical modelling.…”

Section: Introductionmentioning

confidence: 69%

“…The amplitude of parametric satellite was measured using enhanced scattering technique [4]. For this purpose the probing wave with frequency f p = 2.35 GHz < f 0 and small power (< 5 mW) was launched into plasma, at that f 0 − f p < Δ f max .…”

Section: Methodsmentioning

confidence: 99%

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Stimulated scattering in inhomogeneous plasma controlled by slow pump frequency modulation

Pisarev¹,

Kapanik²,

Simonchik³

et al. 2004

Czech. J. Phys.

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In present paper the experimental results for controlling of the stimulated backscattering absolute parametric decay instability (PDI) in inhomogeneous plasma by frequency modulation of pump wave are presented. The case of so called slow frequency modulation is under investigation, when the modulation speed is comparable with daughter ion-sound wave transient time in decay region. The PDI stimulation was observed in experiment at stochastic frequency modulation with enough large correlation time. The dynamics of PDI for stochastic and harmonic modulation was investigated as well. The comparison of obtained results shows the resonance nature of the PDI stimulation. The stimulation is observed when the direction and velocity of decay point moving in plasma are coincides with daughter ion-sound wave ones and the significant PDI enhancement becomes possible due to the effect of resonant suppression of the convective losses from the moving decay region. PACS: 52.35.Mw

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Section: Resultssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 69%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Stimulated scattering in inhomogeneous plasma controlled by slow pump frequency modulation

Pisarev¹,

Kapanik²,

Simonchik³

et al. 2004

Czech. J. Phys.

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“…However, a more detailed theoretical analysis performed in [6] in the framework of inhomogeneous plasma model demonstrated a weak sensitivity of the PDI to the random pump phase modulation. As was shown in [7], the weak PDI sensitivity to the pump-frequency modulation is only observed for the fast modulation. In the case of slow modulation, on the contrary, enhancement of the instability was reported, explained by the effect of convective loss suppression from the moving decay region investigated in [8].…”

mentioning

confidence: 53%

Suppression and Feedback Control of Anomalous Induced Backscattering by Pump-Frequency Modulation

Gusakov²,

Lv³

et al. 2008

Phys. Rev. Lett.

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The possibility of induced backscattering parametric decay instability resonant suppression by harmonic pump-frequency modulation is demonstrated experimentally. It is shown that the pump anomalous reflection is strongly reduced at the modulation frequency equal to the difference of the decay instability eigenfrequencies. The parametric instability feedback control method is proposed based on this effect.

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Inhomogeneous plasma parametric decay instability driven by frequency modulated pump

Arkhipenko¹,

Pisarev²,

Simonchik³

et al. 2004

Physics of Plasmas

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The inhomogeneous plasma parametric decay instability (PDI) is studied in the present paper both experimentally and theoretically for different types of pump wave frequency modulation. It is shown that the theory conclusion on weak sensitivity of inhomogeneous plasma PDI to the pump frequency modulation holds only for modulation faster than the decay wave transient time. In the case of slower modulation, both harmonic and stochastic, the PDI resonant enhancement may take place instead. The expression for amplification in the resonance is derived and several mechanisms of the singularity saturation are studied.

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Parametric decay instability of an inhomogeneous plasma in a frequency-modulated pump wave

Cited by 9 publications

References 5 publications

Stimulated scattering in inhomogeneous plasma controlled by slow pump frequency modulation

Stimulated scattering in inhomogeneous plasma controlled by slow pump frequency modulation

Suppression and Feedback Control of Anomalous Induced Backscattering by Pump-Frequency Modulation

Inhomogeneous plasma parametric decay instability driven by frequency modulated pump

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