Gyrotron FU series — current status of development and applications

Idehara, T.; Mitsudo, S.; Sabchevski, S.; Glyavin, M. Yu.; Ogawa, I.

doi:10.1016/s0042-207x(00)00456-5

Cited by 34 publications

(14 citation statements)

References 11 publications

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“…It should be mentioned that the time scale corresponding to the electron motion (characterized by the transit time of the electrons through the cavity) and the time scale of the amplitude growth are quite different. This allows one to decouple the integration of (1) and (2). Since the transit time is much less it is legitimate to assume that field amplitudes are constant during the flight time of the electron and integrate (1) for the whole ensemble of particles with different initial conditions (azimuthal angles and phases).…”

Section: Physical Model and Computer Codes Used In The Simulationsmentioning

confidence: 99%

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Simulation of Mode Interaction in the Gyrotron FU CW I

Sabchevski

Saito

Idehara

et al. 2007

Int J Infrared Milli Waves

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A series of experiments carried out in order to study the operational performance and oscillation characteristics of a 300 GHz/3.5 kW gyrotron FU CW I have demonstrated a complicated behaviour which is attributed to multimoding phenomena. In this paper we present and discuss some initial results from computer simulation of mode interaction in this tube. They give a better insight in the underlying processes, possible excitation conditions of various competing modes and suggest some directions for continuation of this investigation.

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Section: Physical Model and Computer Codes Used In The Simulationsmentioning

confidence: 99%

“…This being done, Φ s is evaluated averaging over all considered electrons. Then the field amplitudes and phases are updated integrating (2). These three steps are repeated successively in order to trace the time evolution of beam-field interaction.…”

Section: Physical Model and Computer Codes Used In The Simulationsmentioning

confidence: 99%

Simulation of Mode Interaction in the Gyrotron FU CW I

Sabchevski

Saito

Idehara

et al. 2007

Int J Infrared Milli Waves

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“…Following such an approach we succeeded to demonstrate a breakthrough reaching a frequency of 1 THz. The output power at the second harmonic operation is about 10 W, and several kW at the fundamental [7], [8]. Another breakthrough crossing of the symbolic 1 THz threshold has been demonstrated by a gyrotron with a 40 T pulsed magnet developed at IAP in N. Novgorod, Russia.…”

Section: Introductionmentioning

confidence: 99%

High Purity Mode CW Gyrotron Covering the Subterahertz to Terahertz Range Using a 20 T Superconducting Magnet

Idehara

Ogawa

Wágner

et al. 2018

IEEE Trans. Electron Devices

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Abstract-In this paper, we present the current status and both the ongoing investigation and the continuous improvements to the operational performance of a unique gyrotron, which is built using a 20 T superconducting magnet and holds a world record of 10 W THz wave generation at the highest frequency (1.08 THz) in continuous wave (CW) operation. Additionally, it has demonstrated highpurity single-mode generation on a sequence of modes that cover a wide range from sub-THz to THz frequencies at both fundamental and second-harmonic resonances of the electron cyclotron frequency. As an illustration, the measurements of the observed radiation patterns of eight output modes radiated from a currently used resonant cavity with a linear up-taper are presented and compared with the corresponding patterns simulated by scattering matrix calculations. A new design of an optimized cavity with a nonlinear up-taper, which improves further the mode purity of the generated output radiation has been proposed and is currently being implemented as a replacement of the existing resonator. The overall operational performance and the output characteristics of this gyrotron (called FU CW III in accordance with the nomenclature adopted at FIR UF Center) make it a versatile and appropriate source of coherent CW radiation for many novel applications in the fields of high-power THz science and technologies.

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“…Many applications, such as spectroscopy, diagnos- tics and monitoring of various media, dynamic polarization of nuclei, etc., require submillimeter-wave electromagnetic radiation sources which enable smooth frequency tuning [1,2]. Promising devices of this type are gyrotrons having comparatively low power levels compared with the controlled-fusion gyrotrons, specifically, in the range from 10 to 1000 W.…”

Section: Introductionmentioning

confidence: 99%