Plasma effects in a free electron laser

Tripathi, V. K.; Liu, C.S.

doi:10.1109/27.55916

Cited by 36 publications

(15 citation statements)

References 13 publications

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“…[26,27] Antonsen et al [28] addressed the propagation of laser pulses in miniature non-uniform plasma channels due to the channel inhomogeneity and manifestation of guided waves, and achieved efficient excitation of the radiation. It also offers the possibility of using moderate-energy electron beams for obtaining high-frequency radiation.…”

Section: Introductionmentioning

confidence: 99%

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Terahertz radiation emission using plasma‐filled dielectric liner with the effects of pre‐modulated relativistic electron beam

Panwar

Sharma

2018

Contributions to Plasma Physics

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We propose a theoretical model for the efficient emission of high-power terahertz (THz) radiation. The pre-modulation of the beam is accounted for by the interaction of the two laser beams with the relativistic electron beam (REB). The pre-modulated REB travels through a dielectric liner waveguide, which is filled with a plasma. The REB travels near the dielectric lining boundary and therefore transfers maximum energy to the electromagnetic radiation wave via Cerenkov interaction. The growth rate and efficiency of the radiation wave are examined and found to be altered by the parameters of the REB and the dielectric medium. The growth rate varies as one-third power of the beam density and as two-thirds power of the amplitude of the pump wave field. The proposed scheme seems to be an effective method for the generation of tunable THz radiation.

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Section: Introductionmentioning

confidence: 99%

“…It also offers the possibility of using moderate-energy electron beams for obtaining high-frequency radiation. [26,27] Antonsen et al [28] addressed the propagation of laser pulses in miniature non-uniform plasma channels due to the channel inhomogeneity and manifestation of guided waves, and achieved efficient excitation of the radiation.…”

Section: Introductionmentioning

confidence: 99%

Terahertz radiation emission using plasma‐filled dielectric liner with the effects of pre‐modulated relativistic electron beam

Panwar

Sharma

2018

Contributions to Plasma Physics

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“…One of another interesting ways to generate a high-frequency FEL is to employ plasmas to the FELs (Tripathi and Liu 1990;Qian et al 1994;Tsui and Serbeto 1998;Petrillo and Maroli 2000;Yang et al 2002;Wang et al 2003;Liu et al 2004;Babaei and Maraghechi 2008). Wen-Bing and Ya-Shen (1988) have initially proposed and examined the cold plasma-loaded FEL.…”

Section: Introductionmentioning

confidence: 99%

Dispersion relation and growth rate of a relativistic electron beam propagating through a Langmuir wave wiggler

Zirak

Jafari

2015

J. Plasma Phys.

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In this study, a theory of free-electron laser (FEL) with a Langmuir wave wiggler in the presence of an axial magnetic field has been presented. The small wavelength of the plasma wave (in the sub-mm range) allows obtaining higher frequency than conventional wiggler FELs. Electron trajectories have been obtained by solving the equations of motion for a single electron. In addition, a fourth-order Runge-Kutta method has been used to simulate the electron trajectories. Employing a perturbation analysis, the dispersion relation for an electromagnetic and space-charge waves has been derived by solving the momentum transfer, continuity, and wave equations. Numerical calculations show that the growth rate increases with increasing the ebeam energy and e-beam density, while it decreases with increasing the strength of the axial guide magnetic field.

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“…Recently, various experiments based on laser beating (one of fundamental and other at second harmonics) in plasmas have reported efficient THz radiation generation (Esarey et al, 1996;D'Amico et al, 2007;Tani et al, 2000;Xie et al, 2006;Bhasin & Tripathi, 2009;Tripathi & Liu, 1990;Liu & Tripathi, 2009;Dua et al, 2011;Hu et al, 2010;Varshney et al, 2014). Out of various schemes based on laser plasma interaction, THz radiation generation by beating of two lasers of different frequencies and wave numbers in plasmas has shown tremendous potential in terms of amplitude, tunability, efficiency, and directionality (Varshney et al, 2013;2014;Nafil et al, 2013;.…”

Section: Introductionmentioning

confidence: 99%

Strong terahertz radiation generation by beating of two x-mode spatial triangular lasers in magnetized plasma

Varshney

Sajal

Baliyan³

et al. 2014

Laser Part. Beams

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Resonant THz radiation generation is proposed by beating of two spatial-triangular laser pulses of different frequencies (ω 1 , ω 2 ) and wave numbers ( k 1 , k 2 ) in plasma having external static magnetic field. Laser pulses co-propagating perpendicular to a dc magnetic field exert a nonlinear ponderomotive force on plasma electrons, imparting them an oscillatory velocity with finite transverse and longitudinal components. Oscillatory plasma electrons couple with periodic density ripples n ′ = n q0 e iqz to produce a nonlinear current, i.e., responsible for resonantly driving terahertz radiation at (ω = ω 1 − ω 2 , k = k 1 − k 2 + q). Effects of THz wave frequency, laser beam width, density ripples, and applied magnetic field are studied for the efficient THz radiation generation. The frequency and amplitude of THz radiation were observed to be better tuned by varying dc magnetic field strength and parameters of density ripples (amplitude and periodicity). An efficiency about 0.02 is achieved for laser intensity of 2 × 10 15 W/cm 2 in a plasma having density ripples about 30%, plasma frequency about 1 THz and magnetic field about 100 kG.

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Plasma effects in a free electron laser

Cited by 36 publications

References 13 publications

Terahertz radiation emission using plasma‐filled dielectric liner with the effects of pre‐modulated relativistic electron beam

Terahertz radiation emission using plasma‐filled dielectric liner with the effects of pre‐modulated relativistic electron beam

Dispersion relation and growth rate of a relativistic electron beam propagating through a Langmuir wave wiggler

Strong terahertz radiation generation by beating of two x-mode spatial triangular lasers in magnetized plasma

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