Initial results of operating the rocketdyne undulator in a tapered configuration

Curtin, Mark S.; Bhowmik, Anup; Brown, Jason T.; McMullin, Wayne A.; Metty, P.; Benson, Stephen; Madey, J. M. J.

doi:10.1016/0168-9002(90)91191-d

Cited by 13 publications

(6 citation statements)

References 2 publications

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“…To deal with the high optical cavity power a group has proposed using an initial low power oscillator to bunch the beam which then provides high gain and extraction in a second wiggler [57]. Such a concept differs from earlier work on a MOPA (Master Oscillator Power Amplifier) [111] in that the electron transport to the second wiggler must maintain the electrons' phase coherence to the optical wavelength accuracy and so be of exceptionally high quality.…”

Section: Miscellaneous Approachesmentioning

confidence: 99%

Free-electron lasers: vacuum electronic generators of coherent radiation

Freund

Neil²

1999

Proc. IEEE

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Vacuum electronic sources have shown marked improvement since the invention of the magnetron before World War II, and dramatic increases in both average powers and frequencies have been achieved. Of course, much of these gains have been achieved by the development of different devices. The typical development pattern for a given device exhibits an initial period of rapid improvement followed by a plateau determined by technological or physical limitations on the concept. Slow wave devices such as magnetrons and/or klystrons operate efficiently at frequencies up through X-band or he source of the relation ed cavity traveling wave tubes are used for various applications at frequencies ranging up through W-band. At still higher frequencies fast wave devices such as gyrotrons and free-electron lasers are required are required for high power operation.The free-electron laser concept is unique in that the mechanism is applicable across the entire electromagnetic spectrum, and free-electron lasers have been built at wavelengths from microwaves through the ultraviolet, and plans are under development for X-ray systems. Our purpose of this paper is to describe the principal directions of free-electron laser research at the present time. To this end, we first give a brief tutorial of the physics underlying the concept, and then describe the principal development paths under way.

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Section: Miscellaneous Approachesmentioning

confidence: 99%

Free-electron lasers: vacuum electronic generators of coherent radiation

Freund

Neil²

1999

Proc. IEEE

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“…Superconducting energy recovery linacs are the primary drivers for high average power FEL oscillators [64][65][66][67][68][69][70]; however, other types of FEL oscillators have used various techniques to increase the output pulse energy including, but not limited to, optical klystrons [34,36,48,57,58,60,63,[71][72][73][74][75][76], cavity dumping [77][78][79][80][81], pulse stacking in an external cavity [82][83][84], electron beam energy ramping [85,86] or dynamic cavity desynchronization [87][88][89][90][91][92]. Tapering of the undulator [93][94][95] has also been used to improve the peak power in the pulse [96][97][98][99][100], however, tapering of the undulator in FEL oscillators leads to complicated dynamics and a strong dependence on system parameters [101]…”

Section: Introductionmentioning

confidence: 99%

“…Operation at other wavelength ranges is possible through harmonic generation [105][106][107] and such harmonics were quickly observed [40]. Lasing on the third harmonic was first demonstrated using the Standford MARK-III FEL oscillator [108], quickly followed by others [43,48,58,61,97,[109][110][111][112][113][114][115][116][117][118][119][120][121]. The simultaneous generation of multiple wavelengths may be beneficial for certain applications.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional, Time-Dependent Analysis of High- and Low-Q Free-Electron Laser Oscillators

Slot

Freund

2021

Applied Sciences

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Free-electron lasers (FELs) have been designed to operate over virtually the entire electromagnetic spectrum, from microwaves through to X-rays, and in a variety of configurations, including amplifiers and oscillators. Oscillators can operate in both the low and high gain regime and are typically used to improve the spatial and temporal coherence of the light generated. We will discuss various FEL oscillators, ranging from systems with high-quality resonators combined with low-gain undulators, to systems with a low-quality resonator combined with a high-gain undulator line. The FEL gain code MINERVA and wavefront propagation code OPC are used to model the FEL interaction within the undulator and the propagation in the remainder of the oscillator, respectively. We will not only include experimental data for the various systems for comparison when available, but also present, for selected cases, how the two codes can be used to study the effect of mirror aberrations and thermal mirror deformation on FEL performance.

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“…Superconducting energy-recovery linacs are the primary drivers for high average power FEL oscillators [63][64][65][66][67][68][69]; however, other types of FEL oscillators have used various techniques to increase the output pulse energy including but not limited to optical klystrons [33,35,47,56,57,59,62,[70][71][72][73][74][75], cavity dumping [76][77][78][79][80], pulse stacking in an external cavity [81][82][83], electron beam energy ramping [84,85] or dynamic cavity desynchronization [86][87][88][89][90][91]. Tapering of the undulator has also been used to improve the peak power in the pulse [92][93][94][95][96], however, tapering of the undulator in FEL oscillators leads to complicated dynamics and strong dependence on system parameters [97][98][99][100].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional, time-dependent analysis of high- and low-Q free-electron laser oscillators

Slot¹,

Freund²

2021

Preprint

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Free-electron lasers (FELs) have been designed to operate over virtually the entire electromagnetic spectrum from microwaves through x-rays and in a variety of configurations including amplifiers and oscillators. Oscillators can operate in both the low and high gain regime and are typically used to improve the spatial and temporal coherence of the light generated. We will discuss various FEL oscillators ranging from systems with high-quality resonators combined with low-gain undulators to systems with a low-quality resonator combined with a high-gain undulator line. The FEL gain code MINERVA and wavefront propagation code OPC are used to model the FEL interaction within the undulator and the propagation in the remainder of the oscillator, respectively. We will not only include experimental data for the various systems for comparison when available, but also present for selected cases how the two codes can be used to study the effect of mirror aberrations and thermal mirror deformation on FEL performance.

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Initial results of operating the rocketdyne undulator in a tapered configuration

Cited by 13 publications

References 2 publications

Free-electron lasers: vacuum electronic generators of coherent radiation

Free-electron lasers: vacuum electronic generators of coherent radiation

Three-Dimensional, Time-Dependent Analysis of High- and Low-Q Free-Electron Laser Oscillators

Three-dimensional, time-dependent analysis of high- and low-Q free-electron laser oscillators

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