Giant high-peak power pulses in the UV OK-4/Duke storage ring FEL using the gain modulator

Pinayev, I.; Litvinenko, V.N.; Park, Seong Hee; Wu, Y.; Emamian, M.; Hower, N.; Patterson, J.; Swift, G.

doi:10.1016/s0168-9002(01)01572-8

Cited by 20 publications

(8 citation statements)

References 14 publications

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“…Small deviations from exact synchronism are not important in a pulse SR FEL mode (see [3,4] for details) and the extension to the case of integer ratio between the round trip times is straightforward. 2 Experiments with Super pulses are published elsewhere [2,7]. The experiments with efficient harmonic generation support our predictions for Super-pulse.…”

supporting

confidence: 69%

“…SR FELs can operate in pulsed mode [2] with significant peak optical power. Early theoretical models [1] predicted peak intra-cavity (IC) optical power P opt of:…”

mentioning

confidence: 99%

“…1 shows the typical evolution of a Super-pulse in the OK-4/Duke SR FEL predicted by the uvfel code. Our uvfel code [5] includes most SR FEL effects and has been proven very reliable in predicting both e-beam and optical beam parameters in SR FELs [2,4,6,7].…”

mentioning

confidence: 99%

“…In this letter we discuss phenomena responsible for Superpulses in SR FEL 2 . We present a self-consistent set of dimensionless non-linear differential equation describing Super-pulse and the peak power dependencies on key parameters.…”

mentioning

confidence: 99%

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Physics of Super Pulses in Storage Ring Free-Electron Lasers

Litvinenko

2003

Free Electron Lasers 2002

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supporting

confidence: 69%

“…SR FELs can operate in pulsed mode [2] with significant peak optical power. Early theoretical models [1] predicted peak intra-cavity (IC) optical power P opt of:…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Physics of Super Pulses in Storage Ring Free-Electron Lasers

Litvinenko

2003

Free Electron Lasers 2002

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“…Using computer code [5] we modeled OK-4/Duke FEL behavior in the giant pulse mode. The perfect fit of the theoretical and experimental curves was found [6].…”

Section: Giant Pulse Generationmentioning

confidence: 70%

Giant pulse generation using gain modulator

Pinayev

Litvinenko²,

Emamian³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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Using fast steering magnet allowed us to redistribute average power of a storage ring free electron laser in series of short pulses with high peak power. Theory of operation and experimental results are presented. Good agreement was found between measured and predicted parameters. THEORY OF OPERATIONAverage power of the free electron laser (FEL), installed on a storage ring, is limited by an induced energy spread caused by an interaction of an electron beam with optical pulse. This is a well-known Renieri limit [1,2]. Maximal average power is limited either by degradation of the FEL gain or by electron beam losses when energy spread exceeds storage ring acceptance. In most cases the first mechanism prevails and FEL demonstrates spiking behavior, well known in the conventional lasers [3].To reach higher peak power it is possible to switch to a giant pulse mode, when all available in an active media power is released in single macropulse, followed by a relatively long relaxation period.For the storage ring FEL conventional approach, utilizing modulation of optical cavity losses, is not suitable due to the insertion losses and high vacuum requirements. The active media -the electron beam -has negligible inertia and is much easier to manipulate. To stop lasing one can break synchronism between electron and optical bunches by modulating RF frequency (i.e. revolution frequency) or by moving the electron beam from the axis of the optical cavity. We prefer the latter method, because it allows faster handling of the electron beam and do not excite inevitable synchrotron oscillations. It also makes FEL pulse more reproducible with a higher peak power.The gain modulator operates in the following manner: • electron beam is shifted from the lasing orbit and is cooling off towards natural energy spread; • when energy spread reduced to the desirable value, the electron beam is adiabatically moved to the lasing position; • giant pulse is generated causing increase in the energy spread; • cycle is repeated.Frequencies of the betatron oscillations for the Duke storage ring [4] are 0.13·f rev horizontal and 0.185·f rev vertical, where f rev =2.79 MHz is a revolution frequency. Therefore the electron beam can be moved from one orbit to another without exciting of the betatron oscillations in few microseconds.

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New results and prospects for harmonic generation in storage ring FELs

Litvinenko

2003

Free Electron Lasers 2002

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Giant high-peak power pulses in the UV OK-4/Duke storage ring FEL using the gain modulator

Cited by 20 publications

References 14 publications

Physics of Super Pulses in Storage Ring Free-Electron Lasers

Physics of Super Pulses in Storage Ring Free-Electron Lasers

Giant pulse generation using gain modulator

New results and prospects for harmonic generation in storage ring FELs

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