Dr. Svilen Sabchevski | University of Fukui (original) (raw)

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Papers by Dr. Svilen Sabchevski

25th International Conference on Infrared and Millimeter Waves (Cat. No.00EX442), 2000

Abstract In this paper, we present results of numerical experiments performed as a part of a conc... more Abstract In this paper, we present results of numerical experiments performed as a part of a conceptual design study of a large orbit gyrotron (LOG) with an axis-encircling electron beam formed by a novel electron gun with permanent magnet system. The results of simulations indicate the feasibility of a compact LOG with low current and low accelerating voltage operating on TE 41 mode at fourth harmonic. The required magnetic field is produced by NdFeB permanent magnet and additional coils for fine tuning of the field ...

2013 International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves, 2013

Powerful sources of coherent radiation in the sub-terahertz to terahertz frequency range are requ... more Powerful sources of coherent radiation in the sub-terahertz to terahertz frequency range are required for expanding number of applications in the physical research and in various advanced high power THz technologies. In recent years, a spectacular progress in the development of various gyro-devices and in particular, the powerful high frequency (sub-terahertz to terahertz) gyrotron oscillators has demonstrated a remarkable potential for bridging the so−called terahertz power gap and stimulated many novel and prospective applications. In this paper, we outline two series of such gyro-devices, namely the Gyrotron FU Series which includes pulsed gyrotrons and Gyrotron FU CW Series which consist of CW (continuous wave) or long pulse gurotrons. Both series are developed at Research Center for Development of Far Infrared Region, University of Fukui (FIR FU). We present the most remarkable achievements of these devices and illustrate their applications by some characteristic examples. An outlook for the further extension of the Gyrotron FU CW Series is also provided.

25th International Conference on Infrared and Millimeter Waves (Cat. No.00EX442), 2000

[摘要]: 正 In this paper we present a novel design of aquasi-optical system for conversion of gyrotr... more [摘要]: 正 In this paper we present a novel design of aquasi-optical system for conversion of gyrotronoutputs into gaussian beams. It consists of aquasi-optical antenna, four focusing mirrorsand a filter which removes the side lobes of thebeam. The system is capable to convert threeTE_ (on) mode outputs into gaussian beams.

抄録 Born carbide is one of the advanced ceramics and is being used in a wide range of applications... more 抄録 Born carbide is one of the advanced ceramics and is being used in a wide range of applications (eg in control and measuring rods in nuclear reactors, abrasive instruments, thermal shields etc.). A promising method for sintering of such material is based on microwave heating using gyrotron radiation. Although this method has several rapid heat transfer and shorter processing tomes) its potential capabilities are not fully realized in practice. Moreover, in many practical situations it is difficult to find proper experimental ...

Article CITATIONS 0 READS 23 8 authors, including: Some of the authors of this publication are al... more Article CITATIONS 0 READS 23 8 authors, including: Some of the authors of this publication are also working on these related projects: Discharge in the non-uniform gas flow, supported by radiation in the THz range, as a point source of extreme ultraviolet radiation View project Tritium: fuel for fusion reactors View project Toshitaka Idehara University of Fukui 559 PUBLICATIONS 3,130 CITATIONS SEE PROFILE

Abstract High-harmonic gyro-devices with axis-encircling electron beams known as large orbit gyro... more Abstract High-harmonic gyro-devices with axis-encircling electron beams known as large orbit gyrotrons (LOG) represent an appealing alternative to the conventional gyrotrons. In this paper, we investigate the feasibility of such device operating with low current and low energy electron beams formed by a novel electron gun with a permanent magnet system. The results from the numerical experiments indicate the possibility to excite TE 41 mode at fourth harmonic of the cyclotron frequency. Simulations predict generation of microwave ...

Abstract The gyrotrons developed at Fukui University (Gyrotron FU series) are high frequency, hig... more Abstract The gyrotrons developed at Fukui University (Gyrotron FU series) are high frequency, high power devices, covering a broad frequency band in the millimeter and submillimeter wavelength region. Currently, the Gyrotron FU series consists of eight gyrotrons. In this paper, we summarize and illustrate some of the achievements of the Gyrotron FU series.

In this paper results of the investigations of the relationship between the quality of welds and ... more In this paper results of the investigations of the relationship between the quality of welds and the energy of the electron beam and its focusing is presented. The aim of the experiments was to achieve optimum welding parameters to achieve deep, sound welds. In order to find the quantitative correlation between the quality of welds and the total electron beam energy the coefficient k of electron beam energy consumption was defined. It determines the energy of the electron beam expanded for making the weld of a unit length and depth. The study ...

Nuclear Instruments and Methods in Physics Research

Journal of Physics D Applied Physics

ABSTRACT

25th International Conference on Infrared and Millimeter Waves (Cat. No.00EX442), 2000

Abstract In this paper, we present results of numerical experiments performed as a part of a conc... more Abstract In this paper, we present results of numerical experiments performed as a part of a conceptual design study of a large orbit gyrotron (LOG) with an axis-encircling electron beam formed by a novel electron gun with permanent magnet system. The results of simulations indicate the feasibility of a compact LOG with low current and low accelerating voltage operating on TE 41 mode at fourth harmonic. The required magnetic field is produced by NdFeB permanent magnet and additional coils for fine tuning of the field ...

2013 International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves, 2013

Powerful sources of coherent radiation in the sub-terahertz to terahertz frequency range are requ... more Powerful sources of coherent radiation in the sub-terahertz to terahertz frequency range are required for expanding number of applications in the physical research and in various advanced high power THz technologies. In recent years, a spectacular progress in the development of various gyro-devices and in particular, the powerful high frequency (sub-terahertz to terahertz) gyrotron oscillators has demonstrated a remarkable potential for bridging the so−called terahertz power gap and stimulated many novel and prospective applications. In this paper, we outline two series of such gyro-devices, namely the Gyrotron FU Series which includes pulsed gyrotrons and Gyrotron FU CW Series which consist of CW (continuous wave) or long pulse gurotrons. Both series are developed at Research Center for Development of Far Infrared Region, University of Fukui (FIR FU). We present the most remarkable achievements of these devices and illustrate their applications by some characteristic examples. An outlook for the further extension of the Gyrotron FU CW Series is also provided.

25th International Conference on Infrared and Millimeter Waves (Cat. No.00EX442), 2000

[摘要]: 正 In this paper we present a novel design of aquasi-optical system for conversion of gyrotr... more [摘要]: 正 In this paper we present a novel design of aquasi-optical system for conversion of gyrotronoutputs into gaussian beams. It consists of aquasi-optical antenna, four focusing mirrorsand a filter which removes the side lobes of thebeam. The system is capable to convert threeTE_ (on) mode outputs into gaussian beams.

抄録 Born carbide is one of the advanced ceramics and is being used in a wide range of applications... more 抄録 Born carbide is one of the advanced ceramics and is being used in a wide range of applications (eg in control and measuring rods in nuclear reactors, abrasive instruments, thermal shields etc.). A promising method for sintering of such material is based on microwave heating using gyrotron radiation. Although this method has several rapid heat transfer and shorter processing tomes) its potential capabilities are not fully realized in practice. Moreover, in many practical situations it is difficult to find proper experimental ...

Article CITATIONS 0 READS 23 8 authors, including: Some of the authors of this publication are al... more Article CITATIONS 0 READS 23 8 authors, including: Some of the authors of this publication are also working on these related projects: Discharge in the non-uniform gas flow, supported by radiation in the THz range, as a point source of extreme ultraviolet radiation View project Tritium: fuel for fusion reactors View project Toshitaka Idehara University of Fukui 559 PUBLICATIONS 3,130 CITATIONS SEE PROFILE

Abstract High-harmonic gyro-devices with axis-encircling electron beams known as large orbit gyro... more Abstract High-harmonic gyro-devices with axis-encircling electron beams known as large orbit gyrotrons (LOG) represent an appealing alternative to the conventional gyrotrons. In this paper, we investigate the feasibility of such device operating with low current and low energy electron beams formed by a novel electron gun with a permanent magnet system. The results from the numerical experiments indicate the possibility to excite TE 41 mode at fourth harmonic of the cyclotron frequency. Simulations predict generation of microwave ...

Abstract The gyrotrons developed at Fukui University (Gyrotron FU series) are high frequency, hig... more Abstract The gyrotrons developed at Fukui University (Gyrotron FU series) are high frequency, high power devices, covering a broad frequency band in the millimeter and submillimeter wavelength region. Currently, the Gyrotron FU series consists of eight gyrotrons. In this paper, we summarize and illustrate some of the achievements of the Gyrotron FU series.

In this paper results of the investigations of the relationship between the quality of welds and ... more In this paper results of the investigations of the relationship between the quality of welds and the energy of the electron beam and its focusing is presented. The aim of the experiments was to achieve optimum welding parameters to achieve deep, sound welds. In order to find the quantitative correlation between the quality of welds and the total electron beam energy the coefficient k of electron beam energy consumption was defined. It determines the energy of the electron beam expanded for making the weld of a unit length and depth. The study ...

Nuclear Instruments and Methods in Physics Research

Journal of Physics D Applied Physics

ABSTRACT