Dynamic of ion density perturbations observed in a microwave-plasma interaction

Kamal-Al-Hassan, Md.; Ito, Hiroaki; Yugami, Noboru; Nishida, Yasushi

doi:10.1063/1.2126815

Cited by 17 publications

(6 citation statements)

References 15 publications

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“…The plasma density modulation up to 40% was obtained when the microwave pulse duration is near the ion oscillation period. Other experimental studies of plasma wakefield generation, ponderomotive force effects, and self-focusing of microwaves (with frequencies in the range of 3-10 GHz) in plasma were also carried out [16][17][18]. All these experiments were characterized by a relatively low power microwave sources (10-250 kW) with much longer pulses (60 ns-1 µs) than the periods of the plasma electron and ion oscillation.…”

Section: Introductionmentioning

confidence: 99%

“…The density modulation period is of the order of 1 ns over a range of~10 cm, a parameter range much more tractable than the laser/plasma experiments though realized with much lower ponderomotive forces. Early studies of the interaction of microwaves with plasmas were performed at much lower powers (<250 kW and pulse lengths of 50 ns-3 µs) [11,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…[1][2][3][4][5][6][7][8][9] In addition to these non-linear phenomena, the relativistic ponderomotive force and the relativistic mass reveal in the interaction between intense MW and plasma. A number of non-linear phenomena appear during this interaction, including resonance absorption, frequency upshift, charged particle acceleration, and high-energy super-thermal electron generation.…”

Section: Introductionmentioning

confidence: 99%

“…A number of non-linear phenomena appear during this interaction, including resonance absorption, frequency upshift, charged particle acceleration, and high-energy super-thermal electron generation. [1][2][3][4][5][6][7][8][9] In addition to these non-linear phenomena, the relativistic ponderomotive force and the relativistic mass reveal in the interaction between intense MW and plasma. These two non-linear effects arise when the intensity of the MW beam is sufficiently high.…”

Section: Introductionmentioning

confidence: 99%

Variable density formation by intense microwave beams near the critical density

Hashemzadeh

2018

Contributions to Plasma Physics

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Modification of electron density of an inhomogeneous, unmagnetized plasma by the relativistic ponderomotive force of intense microwave beams near the critical density is studied. Using the Maxwell and fluid equations and taking into account the relativistic mass, relativistic ponderomotive force, linear inhomogeneity for electron temperature, and tangential inhomogeneity for electron density, the non-linear electron density, non-linear dielectric permittivity, and non-linear wave equations are derived. Results show that positive and negative values of 1 and 2 (degree of inhomogeneity of the background electron density and electron temperature, respectively) parameters can affect the electric and magnetic field profiles. In addition, profiles of the non-linear electron density indicate that by decreasing the 1 parameter, the amplitude of the peaks increases near the critical density. For positive values of the 2 parameter, by increasing this parameter the amplitude of the peaks increases, while for negative values of the 2 parameter, by decreasing this parameter the amplitude of the peaks increases. KEYWORDSmicrowave-plasma interaction, plasma inhomogeneity, variable density structure 1

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“…In earlier studies, the generation of plasma waves using microwaves was experimentally investigated with relatively low microwave power ð3 À 250 kWÞ and long ð0:05 À 3 lsÞ duration pulses. [10][11][12][13] In these studies, the effects of the microwave absorption, plasma density perturbation, microwave guiding, and ponderomotive force were investigated in both over-and under-dense plasmas. Also, in Ref.…”

Section: Introductionmentioning

confidence: 99%

High power microwave source for a plasma wakefield experiment

Shafir

Shlapakovski

Siman-Tov

et al. 2017

Journal of Applied Physics

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The results of the generation of a high-power microwave ($550 MW, 0.5 ns, $9.6 GHz) beam and feasibility of wakefield-excitation with this beam in under-dense plasma are presented. The microwave beam is generated by a backward wave oscillator (BWO) operating in the superradiance regime. The BWO is driven by a high-current electron beam ($250 keV, $1.5 kA, $5 ns) propagating through a slow-wave structure in a guiding magnetic field of 2.5 T. The microwave beam is focused at the desired location by a dielectric lens. Experimentally obtained parameters of the microwave beam at its waist are used for numerical simulations, the results of which demonstrate the formation of a bubble in the plasma that has almost 100% electron density modulation and longitudinal and transverse electric fields of several kV/cm.

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Dynamic of ion density perturbations observed in a microwave-plasma interaction

Cited by 17 publications

References 15 publications

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

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

Variable density formation by intense microwave beams near the critical density

High power microwave source for a plasma wakefield experiment

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