Time structure of the OK-4/Duke storage ring FEL

Litvinenko, V.N.; Park, S.H; Pinayev, I.; Wu, Y.

doi:10.1016/s0168-9002(01)01569-8

Cited by 22 publications

(8 citation statements)

References 24 publications

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“…It is known that a macrotemporal structure appears in the storage-ring FEL due to a detuning of the optical cavity Couprie et al, 1993;Roux et al, 1997;Litvinenko et al, 2001;Sei et al, 2004). The minute detuning causes period oscillations in the FEL output power and the bunch length, whose typical time scales are from 1 ms to 100 ms.…”

Section: Detuning Of the Cavity Lengthmentioning

confidence: 99%

Electron-bunch lengthening on higher-harmonic oscillations in storage-ring free-electron lasers

Sei

Ogawa

Okuda

2017

J Synchrotron Radiat

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The influence of higher-harmonic free-electron laser (FEL) oscillations on an electron beam have been studied by measuring its bunch length at the NIJI-IV storage ring. The bunch length and the lifetime of the electron beam were measured, and were observed to have become longer owing to harmonic lasing, which is in accord with the increase of the FEL gain. It was demonstrated that the saturated FEL power could be described by the theory of bunch heating, even for the harmonic lasing. Cavity-length detuning curves were measured for the harmonic lasing, and it was found that the width of the detuning curve was proportional to a parameter that depended on the bunch length. These experimental results will be useful for developing compact resonator-type FELs by using higher harmonics in the extreme-ultraviolet and the X-ray regions.

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Section: Detuning Of the Cavity Lengthmentioning

confidence: 99%

Electron-bunch lengthening on higher-harmonic oscillations in storage-ring free-electron lasers

Sei

Ogawa

Okuda

2017

J Synchrotron Radiat

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“…In the so-called oscillator configuration, the laser pulses experience round-trips in an optical cavity, and are synchronously pumped by the electron bunches. The FEL dynamics is mainly governed by the synchronism between the optical pulses and the electron bunches either circulating in a storage ring [3,4] or coming from a linear accelerator [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Suppression of self-pulsing instabilities in free-electron lasers using delayed optical feedback

Évain

Szwaj

Bielawski

et al. 2012

Phys. Rev. ST Accel. Beams

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We show that the macropulse instability affecting storage ring free-electron laser (FEL) oscillators can be suppressed using a delayed optical feedback. The principle, known as coherent photon seeding, consists in reinjecting a very small part of the laser output in the laser cavity in order to create a new deterministic solution. The feedback is shown to be efficient over a large range of the detuning parameter of the FEL cavity, even with very small fractions of reinjected power (< 10 À8 here from inside to inside the cavity). The experiments have been performed on the UVSOR-II storage ring free-electron laser.

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“…The role played by the detuning in the saturation process has also been analyzed [22]. The FEL pulse being in fact shorter than the electron bunch length l , the heating of the electron bunch is not uniformly distributed, and the electron refreshment occurs via the synchrotron motion [23,24]. Besides, the FEL-electron bunch interaction is usually accompanied by a competition between the FEL heating and the process leading to an increase of the electron bunch sizes, such as coherent synchrotron oscillations [25], microwave instability [26], sawtooth regimes [27], head-tail [28], and so on.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal and transverse heating of a relativistic electron bunch induced by a storage ring free electron laser

Labat¹,

Couprie²,

Hosaka³

et al. 2006

Phys. Rev. ST Accel. Beams

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The new trend is to operate storage ring based light sources in a ''chromatic mode'' with a distributed dispersive function in the straight sections for low emittance. The electron bunch heating induced by a storage ring free electron laser (FEL) has been investigated for such optics, and exhibits a more complex saturation process as compared to a usual achromatic mode of operation without dispersion in the straight sections. The correlated measured FEL power is then interpreted in terms of the electron bunch heating and compared to theoretical expectations. Experiments performed at UVSOR-II are here reported. The theoretical interpretation of the new saturation phenomenon is then discussed.

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Time structure of the OK-4/Duke storage ring FEL

Cited by 22 publications

References 24 publications

Electron-bunch lengthening on higher-harmonic oscillations in storage-ring free-electron lasers

Electron-bunch lengthening on higher-harmonic oscillations in storage-ring free-electron lasers

Suppression of self-pulsing instabilities in free-electron lasers using delayed optical feedback

Longitudinal and transverse heating of a relativistic electron bunch induced by a storage ring free electron laser

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