Experimental observation of Cherenkov superradiance from an intense electron bunch

Sergeev, A. S.; Novozhilova, Yu. V.; Zotova, I. V.; Rosenthal, Reece; Phelps, A. D. R.; Cross, A. W.; Aitken, P. P.; Shpak, V. G.; Yalandin, M. I.; Shunaĭlov, S. A.; Ul’maskulov, M. R.

doi:10.1016/s0030-4018(99)00758-0

Cited by 15 publications

(5 citation statements)

References 20 publications

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“…Since the radiation pulse occurs on short time scales less than the single pass transit time of the device, numerical noise has not been an issue for these simulations. SASE and superradiance initiated by CSE have been observed in the Cerenkov maser [7,21,22]. Using PIC simulations, we can extract parameters associated with both the linear and nonlinear regimes of operation.…”

Section: Transient Sase Pic Simulationsmentioning

confidence: 99%

“…However, high power in the transient regime can also be achieved because of distributed effects between the electromagnetic field and the bunch, requiring the behavior of the instability in the nonlinear transient regime to be investigated more carefully. SASE driven superradiance has been observed in Cerenkov masers by Ginzburg et al [21] and Jaroszynski et al [22]. In this regime, it is important to include the effect of the slippage of the radiation pulse along the electron beam since the group velocity of the radiation pulse may be significantly slower than the beam velocity.…”

Section: Introductionmentioning

confidence: 99%

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Transient self-amplified Cerenkov radiation with a short pulse electron beam

Poole

Blackfield

Camacho

2009

Phys. Rev. ST Accel. Beams

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An analytic and numerical examination of the slow wave Cerenkov free electron maser is presented. We consider the steady-state amplifier configuration as well as operation in the self-amplified spontaneous emission (SASE) regime. The linear theory is extended to include electron beams that have a parabolic radial density inhomogeneity. Closed form solutions for the dispersion relation and modal structure of the electromagnetic field are determined in this inhomogeneous case. To determine the steady-state response, a macroparticle approach is used to develop a set of coupled nonlinear ordinary differential equations for the amplitude and phase of the electromagnetic wave, which are solved in conjunction with the particle dynamical equations to determine the response when the system is driven as an amplifier with a time harmonic source. We then consider the case in which a fast rise time electron beam is injected into a dielectric loaded waveguide. In this case, radiation is generated by SASE, with the instability seeded by the leading edge of the electron beam. A pulse of radiation is produced, slipping behind the leading edge of the beam due to the disparity between the group velocity of the radiation and the beam velocity. Short pulses of microwave radiation are generated in the SASE regime and are investigated using particle-in-cell (PIC) simulations. The nonlinear dynamics are significantly more complicated in the transient SASE regime when compared with the steady-state amplifier model due to the slippage of the radiation with respect to the beam. As strong self-bunching of the electron beam develops due to SASE, short pulses of superradiant emission develop with peak powers significantly larger than the predicted saturated power based on the steady-state amplifier model. As these superradiant pulses grow, their pulse length decreases and forms a series of solitonlike pulses. Comparisons between the linear theory, macroparticle model, and PIC simulations are made in the appropriate regimes.

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Section: Transient Sase Pic Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient self-amplified Cerenkov radiation with a short pulse electron beam

Poole

Blackfield

Camacho

2009

Phys. Rev. ST Accel. Beams

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“…The first type is realized during the interaction with the copropagating wave in a waveguide partially filled with dielectric [31] under the synchronism condition:…”

Section: 2čerenkov Superradiancěmentioning

confidence: 99%

“…In those experiments, SR pulses of 300-ps duration with a power of up to 1 MW at a frequency of 40 GHz were obtained [31].…”

Section: 2čerenkov Superradiancěmentioning

confidence: 99%

“…In this respect, in Sec. 2 we present a brief theoretical analysis of SR effects based on various mechanisms of stimulated radiation, as well as results of the first experimental observations of these effects [20][21][22][23][24][25][26][27][28][29][30][31][32][33]. In those experiments, SR pulses with maximum peak power and uniquely short duration (less than 300 ps) were obtained during theČerenkov interaction of a rectilinearly moving electron bunch with a slow spatial harmonic of the counterpropagating electromagnetic wave in a periodic slow-wave system.…”

Section: Introductionmentioning

confidence: 99%

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Generation of high-power ultrashort electromagnetic pulses on the basis of effects of superradiance of electron bunches

Zotova

Pegel

Rostov

et al. 2007

Radiophys Quantum El

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One of the promising methods for generation of ultrashort electromagnetic pulses (with duration of about ten periods of high-frequency oscillations) is radiation from spatially localized electron ensembles (bunches), which can be considered a classical analog of Dicke superradiance known in quantum electronics. In classical electronics, superradiance can be related to various mechanisms of stimulated radiation. Until now, cyclotron, undulator, andČerenkov (in the case of interaction with both copropagating and counterpropagating waves) superradiance of electron bunches as well as superradiance during stimulated scattering of a pump wave have been studied theoretically and experimentally. As a result of these studies based on high-current RADAN and SINUS accelerators and their modifications, a new class of oscillators producing pulsed electromagnetic radiation has been created. They have such unique characteristics as pulses of high peak power (up to 1 GW and 3 GW in the millimeter-and centimeter-wave ranges, respectively) and ultrashort duration (from 300 ps to 1 ns, respectively). In this case, regimes with a peak radiation power exceeding the electron-beam power are experimentally realized. Regimes with high (kilohertz) pulse repetition rate and high average power (up to 2.5 kW) are obtained.

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