Theoretical and experimental comparison of FEL-oscillators with conventional and reversed guide field

Kaminsky, A. K.; Kaminsky, A.A.; Peskov, N. Yu.; Sedykh, S. N.; Sergeev, A. P.; Sergeev, A. S.

doi:10.1109/27.700788

Cited by 28 publications

(12 citation statements)

References 9 publications

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“…(electromagnetic) wave energy extraction. This fact is corroborated by the results of previous FEM amplifier [13,14] and oscillator [9,10] experiments where maximal efficiency was obtained under the reversed guide field orientation.…”

supporting

confidence: 85%

“…In particular, a Bragg resonator of this type was used in the FEM oscillator realized in collaboration between Joint Institute for Nuclear Research (JINR) (Dubna, Russia) and the Institute of Applied Physics, Russian Academy of Sciences (IAP RAS) (Novgorod, Russia) which was driven by a LINAC LIU-3000. In these experiments at the frequency of 31 GHz in the regime of a reversed guide magnetic field, an output power of 35 MW, which represented an electron efficiency of about 25%, was obtained [9,10]. This efficiency outstrips the efficiency of previous Bragg FEM-oscillator experiments which used a guide magnetic field [2,[5][6][7][8].…”

mentioning

confidence: 92%

“…In this regime the rotation of the electrons in the helical wiggler field is opposite to the cyclotron rotation in the guide field (marked by "2" sign further). Computer simulations [10,15] show that these far from cyclotron resonance regimes provide highquality beam formation in tapered wiggler section and have low sensitivity to the initial spread of beam parameters resulting in high-efficiency e-beam͞e.m. (electromagnetic) wave energy extraction.…”

mentioning

confidence: 99%

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High-Efficiency Single-Mode Free-Electron Maser Oscillator Based on a Bragg Resonator with Step of Phase of Corrugation

Ginzburg

Kaminsky²,

Kaminsky³

et al. 2000

Phys. Rev. Lett.

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A new type of high-selective Bragg resonator having a step of corrugation inside the interaction region was used as a microwave system for a free-electron maser (FEM). Using a LINAC LIU-3000 (1 MeV/200 A/200 ns) to drive the FEM oscillator, a single-mode single-frequency operation was achieved at a frequency of 30.74 GHz with an output power of about 50 MW, which corresponded to a record efficiency of 35% for a millimeter wavelength FEM.

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supporting

confidence: 85%

mentioning

confidence: 92%

mentioning

confidence: 99%

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High-Efficiency Single-Mode Free-Electron Maser Oscillator Based on a Bragg Resonator with Step of Phase of Corrugation

Ginzburg

Kaminsky²,

Kaminsky³

et al. 2000

Phys. Rev. Lett.

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“…This result is the same as the one reported in Ref. 15. Figure (11), depicts the maximum temporal growth rate with respect to the transverse component of beam temperature.…”

Section: Numerical Results and Conclusionsupporting

confidence: 79%

Thermal effect on electron trajectory and growth rate in a two-stream free electron laser with a guide field

Mahdizadeh

2018

AIP Advances

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Temperature effects on the electron trajectory and growth rate are investigated for a two-stream free-electron laser (FEL) with a helical wiggler along with a guide magnetic field. Both longitudinal and transverse components of the beam temperature are including providing the full beam temperature effects. Two different cases namely, conventional and reversed guide field are considered. Based on the fluid theory, the dispersion relation for the right hand polarized of the electromagnetic wave, including the important influence of temperature is obtained and solved numerically. Two resonances occur in this model: FEL and two-stream FEL (TS-FEL) resonances. It is shown that both of the peak growths of the resonances are reduced due to temperature. However, peak growth rates are substantially affected owing to transverse component of the beam temperature. The result shows, in the case of a reversed guide field the TS-FEL resonance has low thermal sensitivity with respect to the conventional guide field.

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“…In this regime, the direction of rotation of electrons in the field of a helical undulator is opposite to the direction of their rotation in the guiding field. Modeling shows [19,20] that this regime is optimal from the viewpoint of reducing the sensitivity to the parameter spread of relativistic electron beams and, correspondingly, achievement of a high electronic efficiency. This was confirmed in the previous experimental studies of the FEM oscillator [1,2].…”

Section: Experimental Study Of Free-electron Masers With Oversized Brmentioning

confidence: 99%

Peculiarities of the Mode Spectrum in Free-Electron Masers Based on Oversized Bragg Resonators with a Corrugation Phase Step

Peskov

Kaminsky

Kuzikov

et al. 2016

Radiophys Quantum El

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UDC 621.385We study the operating mode splitting caused by interaction of the neighboring Bragg scattering zones in an oversized Bragg resonator with a corrugation phase step, which is operated at the coupled forward and backward waveguide modes with different transverse structures. This effect is described within the framework of the coupled-wave approach using an advanced four-wave model. It is shown that this effect deteriorates the selective properties of the resonator and, finally, restricts the output power and reduces stability of the narrow-band operating regime in the free-electron masers (FEMs) based on such resonators. The results of the theoretical analysis were corroborated by 3D simulations and "cold" electrodynamic tests. Experimental studies of 30-GHz FEMs with the Bragg resonators having different corrugation depths demonstrated the onset of both narrow-band single-mode and multifrequency multimode oscillation regimes in such resonators. The possibility of power enhancement by using passive compression of the FEM output pulse in a double-frequency oscillation regime is discussed.

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Theoretical and experimental comparison of FEL-oscillators with conventional and reversed guide field

Cited by 28 publications

References 9 publications

High-Efficiency Single-Mode Free-Electron Maser Oscillator Based on a Bragg Resonator with Step of Phase of Corrugation

High-Efficiency Single-Mode Free-Electron Maser Oscillator Based on a Bragg Resonator with Step of Phase of Corrugation

Thermal effect on electron trajectory and growth rate in a two-stream free electron laser with a guide field

Peculiarities of the Mode Spectrum in Free-Electron Masers Based on Oversized Bragg Resonators with a Corrugation Phase Step

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