Common properties of free electron lasers

Bratman, V. L.; Ginzburg, N. S.; Petelin, M. I.

doi:10.1016/0030-4018(79)90382-1

Cited by 140 publications

(44 citation statements)

References 9 publications

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“…The FEL scattron operation is based on the effect of induced scattering of an electromagnetic pump wave of frequency ω p , which is backward to the relativistic electron beam, with the formation of an electromagnetic wave of frequency ω s , co-propagating with the electron beam (useful signal), and an idle wave of frequency ω i , whose role is played by a slow wave of spatial charge in the electron beam [14,15]. In this case, frequencies and wave numbers of the interacting waves are related as…”

Section: Basic Equationsmentioning

confidence: 99%

On the theory of self-modulation instability in an FEL amplifier due to stimulated scattering of counterpropagating waves

Дмитриева

Ryskin

2007

Radiophys Quantum Electron

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We present the results of numerical simulation of the self-modulation processes in an amplifier based on the effect of stimulated scattering of two counterpropagating transverse electromagnetic waves by a relativistic electron beam (FEL amplifier). Two models of the studied system are considered. One model allows for the effects of overbunching of electrons and is based on the modified method of macroparticles. The other is a simplified wave model obtained in the approximation that the amplitude of a combination wave is small if the nonlinearity of the electron-beam processes is negligibly small. The mechanisms of self-modulation are studied. The scenarios of transition to chaos, observed with increase in the input-signal intensity and system length, are examined.

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Section: Basic Equationsmentioning

confidence: 99%

On the theory of self-modulation instability in an FEL amplifier due to stimulated scattering of counterpropagating waves

Дмитриева

Ryskin

2007

Radiophys Quantum Electron

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“…Incoherent SPR was studied in detail by many authors [13][14][15][16]. The idea of developing free electron lasers (FELs) based on coherent SPR was also proposed and analyzed [16][17][18][19]. In 1998, superradiant SPR was observed experimentally at Dartmouth College [20].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of coherent Smith-Purcell radiation at terahertz frequency by optimized grating, prebunched beams, and open cavity

Zhang

Ang

Gover

2015

Phys. Rev. ST Accel. Beams

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This paper studies various mechanisms to enhance the coherent Smith-Purcell radiation (SPR) at terahertz frequencies using particle-in-cell (PIC) simulations. A simple analytical dispersion relation is derived to predict the frequency of the evanescent surface wave of the open grating, which is excited by a backward-wave oscillation mechanism and emits radiation at harmonics of this frequency, and the cavity mode frequencies of the Orotron-like device, all in excellent agreement with the simulation data. The grating parameters are optimized to minimize the starting current of a continuous electron beam for exciting coherent SPR. It is demonstrated that a prebunched beam can be used to selectively excite coherent SPR at desired SPR angle and frequencies that are higher harmonics of the beam bunching frequency, where the starting current requirement is eliminated. Our PIC simulations show the dynamics of modes development and competition for the Orotron-like open cavity structure, which owns a lower starting current than the surface mode process. This oscillation mode dominates at steady state and enhances the radiated power by more than 2 orders of magnitude.

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“…Let us notice that the set of equations (1)- (4) does not include an electron-current parameter, as it has been normalized to the Pierce amplification parameter C I 3 , which is proportional to the cubic root of the electron current [11]. Thus, the normalized length of the system is proportional to the real length and the Pierce parameter:…”

Section: Spatio-temporal Equations Of a Backward-wave Oscillatormentioning

confidence: 99%

“…If the electron-wave interaction causes a relatively small change of the electron energy, then these equations have the form of a mathematical pendulum [11]:…”

Section: Spatio-temporal Equations Of a Backward-wave Oscillatormentioning

confidence: 99%