Duke storage ring UV/VUV FEL: status and prospects

Litvinenko, V.N.; Burnham, B.; Madey, J. M. J.; Park, S.H.; Wu, Y.

doi:10.1016/0168-9002(95)01471-3

Cited by 28 publications

(5 citation statements)

References 9 publications

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“…The Duke electron storage ring is a two-and-one-half generation light source storage ring with a low emittance and a large energy aperture, dedicated to driving advanced light sources including free-electron lasers and Compton light sources [43][44][45]. The storage ring was first commissioned in 1994 with a maximum operation energy of 1.0 GeV.…”

Section: Electron Storage Ringmentioning

confidence: 99%

Research opportunities at the upgraded HIγS facility

Weller

Ahmed

et al. 2009

Progress in Particle and Nuclear Physics

408

253

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Section: Electron Storage Ringmentioning

confidence: 99%

Research opportunities at the upgraded HIγS facility

Weller

Ahmed

et al. 2009

Progress in Particle and Nuclear Physics

408

253

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“…Higher efficiencies in b regimes can be explained easy, if one considers the motion of the electron bunch in the third section (L 2 < Z < L) using the approximation of a homogeneous rf-wave amplitude, aZ; a 0 e iÿiZ . According to motion equations (2), in this case the electron motion can be described by the following Hamiltonian:…”

Section: Mode Interaction and Efficiency In The Klystronlike Schemementioning

confidence: 99%

“…The use of a klystronlike interaction region is a wellknown method for improving the operation of free-electron lasers and masers (FELs and FEMs) (see, e.g., [1][2][3]). A principal schematic of a klystronlike interaction region is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal dynamics of a free electron maser oscillator with broadband feedback and klystronlike interaction region

Savilov

Peskov

Philippov

2005

Phys. Rev. ST Accel. Beams

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Dynamics of interaction of longitudinal modes in a FEM oscillator with a broad-frequency-band feedback system and a klystronlike interaction region is studied. It is shown that the use of the klystronlike interaction region results both in increasing the efficiency of electron energy extraction and decreasing the number of competing modes. The latter provides a significant increase of the electron-current threshold of stability of the single-mode operation.

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“…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.…”

Section: Theory Of Operationmentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

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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Duke storage ring UV/VUV FEL: status and prospects

Cited by 28 publications

References 9 publications

Research opportunities at the upgraded HIγS facility

Research opportunities at the upgraded HIγS facility

Spatiotemporal dynamics of a free electron maser oscillator with broadband feedback and klystronlike interaction region

Giant pulse generation using gain modulator

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