First lasing of the NIJI-IV storage-ring free-electron laser

Yamazaki, Tetsuo; Yamada, Ken‐ichi; Sugiyama, Shigeo; Ohgaki, Hideaki; Sei, N.; Mikado, T.; Noguchi, Toshihiko; Chiwaki, M.; Suzuki, Ryoichi; Kawai, Masayuki; Yokoyama, Minoru; Owaki, K.; Hamada, Shinji; Aizawa, K.; Oku, Y.; Iwata, Atsushi; Yoshiwa, M.

doi:10.1016/0168-9002(93)90008-6

Cited by 60 publications

(10 citation statements)

References 3 publications

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“…However, the maximum number of electron bunches that could oscillate in the FEL was four due to the coupled-bunch instability of the electron beam in the shows the scheme of the infrared FEL system and the measurement configuration of the FEL-Compton backscattering experiments. The NIJI-IV can store up to 16 electron bunches in its circumference of 29.6 m [29]. The energy of the electron is usually operated at 310 MeV in infrared FEL experiments.…”

Section: Experimental Setup Using the Infrared Fel System In The Niji-ivmentioning

confidence: 99%

Multiple-Collision Free-Electron Laser Compton Backscattering for a High-Yield Gamma-Ray Source

2020

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We observed multiple-collision free-electron laser (FEL)-Compton backscattering in which a multi-bunch electron beam makes head-on collisions with multi-pulse FELs in an optical cavity, using an infrared FEL system in the storage ring NIJI-IV. It was demonstrated that the measured spectrum of the multiple-collision FEL-Compton backscattering gamma rays was the summation of the spectra of the gamma rays generated at each collision point. Moreover, it was demonstrated that the spatial distribution of the multiple-collision FEL-Compton backscattering gamma rays was the summation of those of the gamma rays generated at each collision point. Our experimental results proved quantitatively that the multiple collisions in the FEL-Compton backscattering process are effective in increasing the yield of the gamma rays. By applying the multiple-collision FEL-Compton backscattering to high-repetition FEL devices such as energy recovery linac FELs, an unprecedented high-yield gamma-ray source with quasi-monochromaticity and wavelength tunability will be realized.

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Section: Experimental Setup Using the Infrared Fel System In The Niji-ivmentioning

confidence: 99%

Multiple-Collision Free-Electron Laser Compton Backscattering for a High-Yield Gamma-Ray Source

2020

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“…For example, using the Vernier effect of a double cavity resonator to reduce the number of intra-cavity longitudinal modes and subsequent external filtering, an RF-linac-based FEL oscillator was able to provide a single longitudinal mode [54]. FEL oscillators based on storage rings provide a lower relative linewidth within the range 10 −5 to 5 × 10 −4 [34,[55][56][57][58][59][60][61][62][63], due to the higher electron beam quality of storage rings.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the average and peak power are, to a large extent, determined by the accelerator technology. 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…”

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%

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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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“…For example, using the Vernier effect of a double cavity resonator to reduce the number of intra-cavity longitudinal modes and subsequent external filtering, an RF-linac-based FEL oscillator was able to provide a single longitudinal mode [53]. FEL oscillators based on storage rings provide a lower relative linewidth within the range 10 −5 to 5 × 10 −4 [33,[54][55][56][57][58][59][60][61][62] due to the higher electron beam quality of storage rings.…”

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.

show abstract

First lasing of the NIJI-IV storage-ring free-electron laser

Cited by 60 publications

References 3 publications

Multiple-Collision Free-Electron Laser Compton Backscattering for a High-Yield Gamma-Ray Source

Multiple-Collision Free-Electron Laser Compton Backscattering for a High-Yield Gamma-Ray Source

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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