Names and Descriptions

Kaminsky, Jack

doi:10.5840/intstudphil19781027

Cited by 3 publications

(7 citation statements)

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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%

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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%

“…A regime of reversed guide magnetic field [13,14] was chosen for the FEM operation. 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).…”

mentioning

confidence: 99%

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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“…In accordance with previous experimental studies [1][2][3][4][5][6][7][8][9][10][11][12], it was observed that performance of FELs of the mentioned type has strong dependence on strength and orientation of the guide magnetic field. In particular, electron efficiency both for amplifier [6,7] and oscillator [17,18] schemes in regimes with a reversed guide magnetic field remarkably exceeds efficiency in the case of a conventional guide field orientation.…”

Section: Introductionsupporting

confidence: 89%

“…Free electron lasers (FELs) with a guide magnetic field are well established sources of powerful pulsed radiation of millimeter and submillimeter wavelengths bands. Experimental studies of such devices [1][2][3][4][5][6][7][8][9][10][11][12] have demonstrated effective operation with multimegawatt power level at millimeter wavelengths under high Doppler frequency up-shift.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear theory of a free electron laser with a helical wiggler and an axial guide magnetic field

Ginzburg

Peskov

2013

Phys. Rev. ST Accel. Beams

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A 1D nonlinear theory of a free electron laser (FEL) with a helical wiggler and an axial guide magnetic field is developed based on averaged equations of the electron motion. By averaging we separated two different cases of the e-beam/rf-wave interaction. The first one corresponds to the traditional wiggler synchronism (resonance) of rf wave with the electrons moving along stationary helical trajectories. The second one corresponds to combination resonances distinguishing by excitation of oscillation of the electrons near the stationary helical trajectory. Comparative analysis of the FEL operation in different regimes has been studied under the traditional wiggler synchronism condition. It was shown that FELs operated far from cyclotron resonance (including a reversed guide field orientation) possess low sensitivity to the initial velocity spread in the driving beam resulting in high electron efficiency. In contrast, under the weak guide field (the gyrofrequency is less than the bounce frequency) of a conventional orientation, the FEL efficiency is restricted by a significant increase in the transverse velocity of the electrons during the interaction with the rf wave that results in violation of the synchronism conditions and is accompanied by electron current losses. An additional mechanism of FEL efficiency enhancement under the conventional guide field orientation in the conditions when the gyrofrequency is higher than the bounce frequency, based on the dependence of the effective mass of the oscillating electrons on their energy, was demonstrated. Results of the theoretical analysis are compared with the results of experimental studies of FEL oscillators. The specific features of energy extraction from the electron beam under condition of an abnormal Doppler effect in the case of the combination resonance are described. This regime is beneficial to increase radiation frequency keeping wiggler period and electron energies.

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“…Versions of the view have been propounded by Alvin Plantinga, Leonard Linsky, John Searle, and others (see Plantinga 1978, Linsky 1977, and Searle 1983. More recently, Stanley has argued that the doctrine is far from having been refuted (Stanley 1997).…”

Section: Obstinacy and Actualized Descriptivismmentioning

confidence: 97%

In Defense of Obstinacy

Branquinho

2003

Philosophical Perspectives

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Names and Descriptions

Cited by 3 publications

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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

Nonlinear theory of a free electron laser with a helical wiggler and an axial guide magnetic field

In Defense of Obstinacy

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