Gain and efficiency enhancement of a Cerenkov free electron laser by a prebunched electron beam in a dielectric loaded waveguide

Sharma, Suresh C.; Bhasin, Anuradha

doi:10.1063/1.2722310

Cited by 17 publications

(3 citation statements)

References 33 publications

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“…In their analysis, they neglected the space charge effect and performed the calculations only in the low-gain regime. The analysis was further extended by several authors [5][6][7][8][9][10] by setting up the coupled Maxwell-Vlasov equations, and the growth rate was calculated. In most of the earlier analyses, the electron motion was assumed to be one dimensional in the presence of strong external static magnetic field [3][4][5]15].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Čerenkov free-electron lasers

Kalkal

Kumar

2015

Phys. Rev. ST Accel. Beams

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We present an analysis of a Čerenkov free-electron laser (FEL) driven by a flat electron beam. In this system, an electron beam traveling close to a dielectric slab placed at the top of an ideal conductor interacts with the copropagating electromagnetic surface mode. The surface mode arises due to singularity in the reflectivity of the dielectric slab for the incident evanescent wave. Under suitable conditions, the surface mode grows as a result of interaction with the electron beam. We show that the interaction of the surface mode with the copropagating electron beam can be rigorously understood by analyzing the singularity in the reflectivity. Using this approach, we set up coupled Maxwell-Lorentz equations for the system, in analogy with conventional undulator based FELs. We solve these equations analytically in the small signal regime to obtain formulas for the small signal gain, and the spatial growth rate. Saturation behavior of the system is analyzed by solving these equations numerically in the nonlinear regime. Results of numerical simulations are in good agreement with the analytical calculations in the linear regime. We find that Čerenkov FEL under appropriate conditions can produce copious coherent terahertz (THz) radiation.

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Section: Introductionmentioning

confidence: 99%

Analysis of Čerenkov free-electron lasers

Kalkal

Kumar

2015

Phys. Rev. ST Accel. Beams

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“…[18][19][20] The use of a pre-bunched electron beam in free-electron lasers leads to coherent emission with reduction in the accumulation time of the radiation. [21,22] Sharma and Bhasin [23] studied the effect of beam pre-bunching on the Cerenkov free-electron laser and found that significant improvement in gain and efficiency can be achieved if the frequency of the modulated electron beam becomes comparable to that of radiation wave.…”

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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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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“…The emission of high‐power terahertz (THz) radiation from a free‐electron laser (FEL) using a pre‐bunched electron beam has been a field of interest for several years due to its potential applications in diverse areas including spectroscopy, medicine, security, and defense . Pre‐bunching of the beam leads to coherent emission of the radiation with enhanced power and efficiency …”

Section: Introductionmentioning

confidence: 99%

Modeling of terahertz radiation emission from a free‐electron laser

Sharma

Panwar

Sharma

2017

Contrib. Plasma Phys

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In this article, we report the generation of terahertz (THz) radiation using the interaction of a laser-modulated relativistic electron beam (REB) with a surface plasma wave. Two laser beams propagating through the modulator interact with the REB, leading to velocity modulation of the beam. This results in pre-bunching of the REB. The pre-bunched beam travels through the drift space, where the velocity modulation translates into density modulation. The density-modulated beam, on interacting with the surface plasma pump wave, acquires an oscillatory velocity that couples with the modulated beam density to give rise to a nonlinear current density which acts as an antenna to give THz radiation. By optimizing the parameters of the beam and the wiggler, we obtain power of the order of 10 −4 using the current scheme. KEYWORDSfree-electron laser, surface plasma wave, terahertz radiation, wiggler 1

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Gain and efficiency enhancement of a Cerenkov free electron laser by a prebunched electron beam in a dielectric loaded waveguide

Cited by 17 publications

References 33 publications

Analysis of Čerenkov free-electron lasers

Analysis of Čerenkov free-electron lasers

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

Modeling of terahertz radiation emission from a free‐electron laser

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