Observation of temporal plasma-wave echoes in an ion-wave regime

Yugami, Noboru; Kusaka, Shiroh; Nishida, Yasushi

doi:10.1103/physreve.49.2276

Cited by 10 publications

(10 citation statements)

References 15 publications

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“…3,5,11 Another physical phenomenon to eject particles from the resonance region is that when the resonant electric field goes to a sufficiently high level, the associated ponderomotive force pushes the trapped electrons in the wave toward the outside and, as a consequence, these suprathermal electrons can pull the ions from the critical density layer by the ambipolar Coulomb force and drive a suprathermal ion bunch. 10,17,[19][20][21] In the present experiment, it is also observed that a self-consistent ambipolar force pulls out the ion bunch from the resonance region and this ion bunch can travel through the underdense plasma. The energy of this accelerated ion bunch is observed տ10 kT e .…”

Section: Introductionsupporting

confidence: 66%

“…The ponderomotive force expels electrons from the resonance region, resulting in leaving a bunch of ions around the neighborhood of the critical surface layer, and finally this bunch of ions can be accelerated by the created ambipolar Coulomb force from the resonant layer. 10,17,[19][20][21]23 One can observe in the typical oscillogram shown in Fig. 4 that the resonant absorption of a short microwave pulse produces a bunch of accelerated ions.…”

Section: Resultsmentioning

confidence: 91%

“…Many new phenomena have been explored by microwave plasma interaction experiments. [3][4][5][6][7][8][9][10][11] Resonant absorption occurs when a plane p-polarized electromagnetic ͑EM͒ wave is incident obliquely in an unmagnetized, inhomogeneous plasma. The incident EM wave reflects at a density determined by the relation p (z)ϭ 0 cos , where 0 is the incident wave frequency and is the angle of incidence defined as the angle between the propagation vector k of the incident microwave and the direction of the density gradient scale length L z of the plasma.…”

Section: Introductionmentioning

confidence: 99%

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Observation of ion wave streamers and low frequency sheath instability by the resonant absorption due to nonlinear interaction of microwave-plasma

et al. 2004

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Unmagnetized, inhomogeneous laboratory plasma irradiated by an oblique p-polarized microwave with pulse length 0.2-1.5 s and power Pϭ1-2 kW is studied. The incident electromagnetic wave is linearly converted into an electrostatic plasma wave when the incident wave frequency 0 is equal to the local plasma frequency p. The localized linear enhancement of the driven oscillating field can lead to nonlinear phenomena driven by the ponderomotive force, which expels electrons from the resonance region, and the resulting ambipolar electrostatic fields also expel the ions, creating density cavities at the resonance region. Expelled ions tend to form an ion bunch and accelerate up to energies greater than 10 kT e. After all these processes are achieved, it has been observed in the experiment that the density cavity develops as ion wave streamers and propagate both up and down the density gradient from the resonant layer. It is observed that the downward streamer velocity V down and upward streamer velocity V up have the relation as V down ϾC s ϾV up. Another physical phenomenon, called the low frequency sheath instability, in the plasma sheath area created by the accelerated ion bunch near the resonant region, is also observed in the experiment.

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Section: Introductionsupporting

confidence: 66%

Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Observation of ion wave streamers and low frequency sheath instability by the resonant absorption due to nonlinear interaction of microwave-plasma

et al. 2004

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“…[1][2][3][4][5][6][7] Some of the observed consequences are generation of high-energy electron bunches, 1,2 excitation of temporal plasma-wave echoes in the ion wave regime, 3 excitation of ion-wave wakefield, 4 large amplitude electron plasma waves (EPW) based plasma accelerators, 5,6 and self-generation of magnetic fields. 7 The propagation of electromagnetic (em) waves through temporally growing plasmas has also been analyzed, mainly in theory, [8][9][10] including the study of dynamic behavior of microwaves through a gaseous medium that get ionized in the incident wave field.…”

Section: Introductionmentioning

confidence: 99%

Observation of electron plasma waves inside large amplitude electromagnetic pulses in a temporally growing plasma

Pandey¹,

Bhattacharjee²,

Sahu³

2012

Physics of Plasmas

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Observation of electron plasma waves excited inside high power ($10 kW) short pulse ($20 ls) electromagnetic (em) waves interacting with a gaseous medium (argon) in the pressure range 0.2-2.5 mTorr is reported. The waves have long wavelength ($13 cm) and get damped at time scales slower ($3 ls) than the plasma period (0.1-0.3 ls), the energy conveyed to the medium lead to intense ionization (ion density n i $ 10 11 cm À3 and electron temperature T e $ 6-8 eV) and rapid growth of the plasma ($10 5 s À1 ) beyond the waves. Time frequency analysis of the generated oscillations indicate the presence of two principal frequencies centered around 3.8 MHz and 13.0 MHz with a spread Df $ 4 MHz, representing primarily two population of electrons in the plasma wave. The experimental results are in reasonable agreement with a model that considers spatiotemporal forces of the em wave on the medium, space charges and diffusion.

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“…When a high energy density laser, producing high intensity (>10 16 W/cm 2 ) ultra-short pulses (~30 fs), is directed into a high density plasma (~10 18 cm −3 ), the extremely high laser electric fields act as a ponderomotive force generating a charge separation in the plasma, a wake. The latter is accompanied by strong electric fields, a wakefield (>100 GV/m) which can be used instead of a vacuum accelerator cell as an accelerating gradient for charged particles [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Experiments Designed to Study the Non-Linear Transition of High-Power Microwaves through Plasmas and Gases

Krasik

Leopold

Shafir

et al. 2019

Plasma

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The interaction of powerful sub-picosecond timescale lasers with neutral gas and plasmas has stimulated enormous interest because of the potential to accelerate particles to extremely large energies by the intense wakefields formed and without being limited by high accelerating gradients as in conventional accelerator cells. The interaction of extremely high-power electromagnetic waves with plasmas is though, of general interest and also to plasma heating and wake-field formation. The study of this subject has become more accessible with the availability of sub-nanosecond timescale GigaWatt (GW) power scale microwave sources. The interaction of such high-power microwaves (HPM) with under-dense plasmas is a scale down of the picosecond laser—dense plasma interaction situation. We present a review of a unique experiment in which such interactions are being studied, some of our results so far including results of our numerical modeling. Such experiments have not been performed before, self-channeling of HPM through gas and plasma and extremely fast plasma electron heating to keV energies have already been observed, wakefields resulting from the transition of HPM through plasma are next and more is expected to be revealed.

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Observation of temporal plasma-wave echoes in an ion-wave regime

Cited by 10 publications

References 15 publications

Observation of ion wave streamers and low frequency sheath instability by the resonant absorption due to nonlinear interaction of microwave-plasma

Observation of ion wave streamers and low frequency sheath instability by the resonant absorption due to nonlinear interaction of microwave-plasma

Observation of electron plasma waves inside large amplitude electromagnetic pulses in a temporally growing plasma

Experiments Designed to Study the Non-Linear Transition of High-Power Microwaves through Plasmas and Gases

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