Publications (5)0 Total impact
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Conference Proceeding: Development of a large orbit gyrotron (LOG) operating at higher harmonics
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ABSTRACT: Large orbit gyrotrons (LOGs) are being developed by use of a permanent magnet system. The operation test shows that the LOG radiates at high harmonic frequency up to fifth. Computer simulation results are compared with the experimental results.Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics, 2005. IRMMW-THz 2005. The Joint 30th International Conference on; 10/2005 -
Conference Proceeding: Development of a large orbit gyrotron with a permanent magnet system
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ABSTRACT: The development of a high harmonic gyrotron using a permanent magnet system is presented. On the basis of the design for a high harmonic gyrotron, using an encircling large-orbit electron beam and a permanent magnet system (large orbit gyrotron, LOG), a gyrotron tube has been constructed. The construction of a permanent magnet system has been also completed. The maximum field intensity is a little bit higher than 1 T. This work is being carried out as a collaboration with the Shin-etsu Kagaku Company, Institute of Applied Physics, Russian Academy of Science (IAP-RAS) and Institute of Electronics, and Bulgarian Academy of Science (IE-BAS). The gyrotron has already achieved 3rd, 4th and 5th harmonic operations with relatively high efficiency. Corresponding frequencies are 89 GHz, 113 GHz and 138 GHz, respectively. The output power at the 3rd harmonic operation was 2.5 kW and the efficiency 6.3%.Physics and Engineering of Microwaves, Millimeter, and Submillimeter Waves, 2004. MSMW 04. The Fifth International Kharkov Symposium on; 07/2004 -
Article: Development of a high harmonic gyrotron with an axis-encircling electron beam and a permanent magnet
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ABSTRACT: A gyrotron with an axis-encircling electron beam is useful for high frequency operation, because the high beam efficiency is kept even at high harmonic of electron–cyclotron resonance. We have designed and constructed such a gyrotron with a permanent magnet. The gyrotron has already succeeded in operation at the third harmonic and the fourth harmonic resonances. The operation frequencies are 89.3 and 112.7 GHz, respectively. Operation cavity modes are TE311 and TE411. The permanent magnet system consists of many magnet elements made of NbFeB and additional coils for controlling the field intensities in cavity and electron gun regions. The magnetic field at the cavity region can be varied from 0.97 to 1.18 T. At the optimum condition of the magnetic field intensity, the output power at the third harmonic operation is 2.5 kW. The operation is pulsed, the pulse length is 1 ms and the repetition frequency is 1 Hz. The beam energy and current are 40 kV and 1.2 or 1.3 A. Starting current, beam efficiency and emission pattern also have been measured. In this paper, the operation results of the gyrotron and comparison with the computer simulation results are described.Vacuum. -
Article: Design of a Large Orbit Gyrotron with a Permanent Magnet System
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ABSTRACT: The paper presents results of numerical analysis and outlines the computer-aided design of a novel high-harmonic gyrotron with a beam of electrons gyrating along axis-encircling trajectories. The electron beam is formed by a novel electron-optical system (EOS) based on an electron gun of diode type with thermionic cathode and gradual reversal of the magnetic field. The results of numerical simulations predict satisfactory performance of the EOS and appropriate beam quality parameters. The tube design allows one to install different cavities optimized for excitation of TE4,1 mode at the fourth harmonic of the cyclotron frequency or TE3,1 mode at the third one. The target parameters of the device are: frequency about 112 GHz; output power near 1 kW and efficiency of several percent. -
Article: Development of a high harmonic gyrotron with an axis-encircling electron beam and a permanent magnet
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ABSTRACT: A gyrotron with an axis-encircling electron beam is useful for high frequency operation, because the high beam efficiency is kept even at high harmonic of electron–cyclotron resonance. We have designed and constructed such a gyrotron with a permanent magnet. The gyrotron has already succeeded in operation at the third harmonic and the fourth harmonic resonances. The operation frequencies are 89.3 and 112.7 GHz, respectively. Operation cavity modes are TE311 and TE411. The permanent magnet system consists of many magnet elements made of NbFeB and additional coils for controlling the field intensities in cavity and electron gun regions. The magnetic field at the cavity region can be varied from 0.97 to 1.18 T. At the optimum condition of the magnetic field intensity, the output power at the third harmonic operation is 2.5 kW. The operation is pulsed, the pulse length is 1 ms and the repetition frequency is 1 Hz. The beam energy and current are 40 kV and 1.2 or 1.3 A. Starting current, beam efficiency and emission pattern also have been measured. In this paper, the operation results of
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Institutions
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2005
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Fukui University
Fukui-shi, Fukui-ken, Japan
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