Ion acoustic wave generation by a standing electromagnetic field in a subcritical plasma

Fischer, Peter; Gauthereau, C.; Godiot, J.

doi:10.1051/jphys:01987004802023300

Cited by 14 publications

(6 citation statements)

References 6 publications

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“…Similar shifting at the same velocity is also observed before in Figure 8(b) corresponding to the E r -plots. These observations indicate that the plasma density gradient near the ECR surface is accompanied by the generation of ion acoustic waves that are electrostatic in nature [39,40]. Hence, the electric field polarity reversal associated with electrostatic ion wave heating is being initiated during this period of the plasma evolution after the microwave launch.…”

Section: E Z -Field Evolution In Plasma With Timementioning

confidence: 90%

“…The average value of the electron velocity on the microwave timescale is obtained from the assumption of Maxwellian distribution function and from the first derivative of the Boltzmann equation. The following drift-diffusion equations are shown that are used to compute the electron density and electron energy density:t ∂n e ∂t þ ∇: Àn e μ e :E ðÞ À D e :∇n e ½ ¼ R e (40) ∂n ɛ ∂t þ ∇:…”

Section: Simulation Modeling Of Mw Interaction In Plasmamentioning

confidence: 99%

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Evolution of Microwave Electric Field on Power Coupling to Plasma during Ignition Phase

Mallick¹,

Bandyopadhyay²,

Kumar³

2020

Selected Topics in Plasma Physics

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During the gas ignition process, the plasma and the microwave electric fields are evolved with time together in the plasma volume. The spatio-temporal evolution pattern of microwave-radiated plasma parameters is reported here, highlighting the role of these electric fields on power coupling processes. Evolutions of electric field and so power coupling processes are calculated using the finite element method (FEM). It is observed that the main power coupling mechanism is electron cyclotron resonance (ECR) method; however, with the evolution of plasma, the mode shifts from ECR to off-ECR-type heating with time. Off-ECR heating in the form of upper hybrid resonance (UHR) method, electrostatic (ES) ion acoustic wave heating method is important heating mechanisms during highly dense plasma condition, when density is above critical density for launched frequency, 2.45 GHz. The conclusions on the shifting of heating mechanisms are also drawn based on the 3D maps of spatio-temporal plasma density and hot electron temperature evolution.

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Section: E Z -Field Evolution In Plasma With Timementioning

confidence: 90%

Section: Simulation Modeling Of Mw Interaction In Plasmamentioning

confidence: 99%

Evolution of Microwave Electric Field on Power Coupling to Plasma during Ignition Phase

Mallick¹,

Bandyopadhyay²,

Kumar³

2020

Selected Topics in Plasma Physics

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“…EMW's are launched by a horn (Fischer et al 1987) along the x axis with a frequency of 3.5 GHz; the pulse width r can be varied from 0.1 to 50 /xs and the peak power P, is less than 2 kW. The EMW's are launched in the subcritical side of the plasma, they propagate…”

Section: Experimental Arrangementmentioning

confidence: 99%

Chaotic behavior of resonant absorption in the microwave range

et al. 1991

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The nonlinear evolution of electrostatic plasma waves excited by mode conversion is studied in an inhomogeneous, collisionless, unmagnetized plasma. Experiments in the microwave range ( / = 3.5 GHz), performed in a plasma (n e = 10" cm~3) created in a multipolar discharge, show that the electrostatic plasma-wave evolution exhibits a transition from a nonlinear steady-state regime toward chaos, occurring when the pump field or the gradient length is increased. The Zakharov equations, which model the plasmawave evolution coupled with low-density perturbation, are solved numerically with parameters close to those of the experiment; this simulation allows a characterization of the two regimes.

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“…It can be shown that X waves convert into EBW and ion waves at Upper Hybrid Resonance (UHR) [7], when ω RF = ω 2 p + ω 2 c . UHR can exist only if simultaneously B < B ECR and n e < n cut-off , so EBW can be generated in a plasma only if the magnetic field is below resonance (B < B ECR ) and the electron density is under-dense (n e < n cut-off ) somewhere in the plasma chamber.…”

Section: Introductionmentioning

confidence: 99%

“…They appear as additional components in the wave spectrum. The standing wave nature of the electromagnetic energy, which is additionally amplified in the proximity of UHR, could generate some "zero-frequency" oscillations able to excite ion sound waves at very low frequency [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of an Overdense Plasma in a Compact Ion Source

Castro

Romano²,

Altana

et al. 2015

Acta Polytech

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Abstract. Electron Cyclotron Resonance Ion Sources (ECRIS) are compact plasma-based machines able to feed particle accelerators with high intensity beams of multi-charged ions. ECRIS plasmas are density-limited, since they are sustained by E.M. wave propagation up to a cut-off density value. In the past, the only way to improve ECRIS performance was to increase the microwave frequency and the magnetic field strength to satisfy the ECR condition. A different plasma heating mechanism is being applied at INFN-LNS. It is based on Electron Bernstein Waves (EBW), i.e., electrostatic waves which do not suffer any density cut-off. Highlights concerning preliminary signatures of EBW formation and subsequent absorption are given here.

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Ion acoustic wave generation by a standing electromagnetic field in a subcritical plasma

Cited by 14 publications

References 6 publications

Evolution of Microwave Electric Field on Power Coupling to Plasma during Ignition Phase

Evolution of Microwave Electric Field on Power Coupling to Plasma during Ignition Phase

Chaotic behavior of resonant absorption in the microwave range

Experimental Characterization of an Overdense Plasma in a Compact Ion Source

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