Radiation by electron bunching in large-amplitude Langmuir waves

Weatherall, James C.; Hobbs, W. E.

doi:10.1063/1.865566

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…One instance that has received some attention is radiation by electron bunching in large-amplitude Langmuir waves excited in electron beam-plasma interactions. 10 Weatherall and Hobbs showed that electrostatic bunching was an effective means of generating plasma harmonics. Subsequently, Weatherall and Benford reported a spectrum showing strong emission at the plasma line and its harmonics with a power spectrum below a cut-off at ϳ c ,…”

mentioning

confidence: 99%

Power law decay of harmonic spectra in ultrarelativistic laser-plasma interactions

Boyd¹,

Ondarza-Rovira²

2010

Physics of Plasmas

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Imaging spectroscopy diagnosis of internal electron temperature and density distributions of plasma cloud surrounding hydrogen pellet in the Large Helical Device Rev. Sci. Instrum. 83, 093506 (2012) Density and temperature effects on Compton scattering in plasmas Phys. Plasmas 19, 093115 (2012) Synchronized operation by field programmable gate array based signal controller for the Thomson scattering diagnostic system in KSTAR Rev. Sci. Instrum. 83, 093505 (2012) Microwave scattering from laser spark in air

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mentioning

confidence: 99%

Power law decay of harmonic spectra in ultrarelativistic laser-plasma interactions

Boyd¹,

Ondarza-Rovira²

2010

Physics of Plasmas

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“…Radiation from electron bunching in large-amplitude Langmuir waves has been considered previously in cases where these have been excited in beam-plasma interactions. In particular, Weatherall and Hobbs [7] showed that electrostatic bunching was an effective means of generating plasma harmonics. Subsequently, Weatherall and Benford (WB) [8] modelled these fields as soliton-like structures generated inside the plasma and showed that these sources gave rise to strong nonlinear perturbations when high energy electron beams traverse such structures resulting in broadband bremsstrahlung emission.…”

Section: Plasma and Xuv Harmonic Emission From Ultra-relativisticallymentioning

confidence: 99%

Plasma emission and radiation from ultra-relativistic Brunel electrons in femtosecond laser-plasma interactions

Ondarza-Rovira

Boyd

2015

J. Phys.: Conf. Ser.

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A highly intense femtosecond laser pulse incident on a plasma target of supercritical density, gives rise to reflected high-order harmonics of the laser frequency. The radiation model adopted here considers Brunel electrons -those reinjected into the plasma after performing a vacuum excursion-perturbed by a localized turbulent region of an electrostatic field that is generated during the interaction, and characterized by a soliton-like structure. The observed power spectrum is characterized by a power-law decay scaled as P m ∼ m −p , where m denotes the harmonic order. In this work an appeal is made to a radiation mechanism from a single particle model that shows harmonic power decays described -as previously reported from particle-in-cell simulations-within the range 2/3 ≤ p ≤ 5/3. Plasma emission is strongest for values of the similarity parameter S = (n e /n c )/a 0 in the range 1 ≤ S ≤ 5, and where n e and n c are the ambient electron plasma density and the critical density, respectively, and a 0 is the normalized parameter of the electric field of the incident light. It was found that the radiation spectra obtained from the single particle model here presented is consistent with previously reported power-law 5/3 decays from particle-in-cell simulations.

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“…Weatherall and Hobbs [10] showed that electrostatic bunching was an effective means of generating plasma harmonics. Subsequently, Weatherall and Benford (WB) [11] reported a spectrum showing strong emission at the plasma line and its harmonics with a power spectrum below a cut-off at ω ∼ ω c , …”

Section: Plasma and Harmonic Emission From Relativistic Electrons Permentioning

confidence: 99%

Plasma effects in harmonic emission in relativistic laser interactions with overdense plasma targets examined from single particle radiation models

Ondarza-Rovira

Boyd

2012

J. Phys.: Conf. Ser.

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Multiple attosecond pulse generation in relativistically laser-driven overdense plasmas X Lavocat-Dubuis, F Vidal, J-P Matte et al.High-order harmonic generation using plasma mirrors F Quéré, C Thaury, H George et al. Abstract. Intense femtosecond laser pulses incident on supercritical plasmas can generate reflected high-order harmonics of the fundamental frequency that extend over the xuv spectral region, characterized by a power decay Pm ∼ m −p , where m is the harmonic number. It has been shown in earlier reports that plasma effects can modify the emission spectrum producing decay indexes p significantly weaker than the universal value 8/3 predicted by the similarity theory, these being within the range 4/3 ≤ p ≤ 8/3. In this paper we employ two single particle radiation models to demonstrate that plasma density effects substantially modify the emission radiated by a relativistic electron accelerated by the electric field of the laser pulse, and show that the harmonic power decay is commonly characterized by the indexes 4/3 and 5/3, with remarkable similitudes to those particle-in-cell results recently reported in ultrarelativistic laser-plasma interactions.

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Radiation by electron bunching in large-amplitude Langmuir waves

Cited by 7 publications

References 16 publications

Power law decay of harmonic spectra in ultrarelativistic laser-plasma interactions

Power law decay of harmonic spectra in ultrarelativistic laser-plasma interactions

Plasma emission and radiation from ultra-relativistic Brunel electrons in femtosecond laser-plasma interactions

Plasma effects in harmonic emission in relativistic laser interactions with overdense plasma targets examined from single particle radiation models

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