Simulation of Mode Interaction in the Gyrotron FU CW I

Sabchevski, S.; Saito, T.; Idehara, T.; Nakano, Tomoaki; Tatematsu, Y.

doi:10.1007/s10762-007-9294-9

Cited by 9 publications

(9 citation statements)

References 18 publications

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“…Then, as expected from the qualitative estimation given above, the starting current of the TE 19,9 mode becomes comparable to that of the TE 22,8 mode for V c =15 kV at B c =10.93 T. Therefore, in principle, oscillation of the TE 19,9 mode can take place when V c is increased and consequently saturation of the output power may result. In addition, the difference between the upper bounday of B c of the TE 28,8 mode and that of the TE 19,9 mode at the same V c is about 0.08 T. This is nearly equal to the difference of the upper boundaries of the areas of Beam 1 and 3 in Fig. 10.…”

Section: Discussionmentioning

confidence: 74%

“…We have identified the Beam 3 as the TE 19,9 mode without specification of the rotating direction. Counter-rotating TE 19,9 mode competes with the co-rotating TE 28,8 mode. However, counter-rotating mode power is not efficiently radiated form the Vlasov radiator designed for co-rotating modes.…”

Section: Discussionmentioning

confidence: 99%

“…Based on a simple calculation of the starting current, TE 3,16 mode and then TE 5,15 mode may become a predominant mode within a narrow range of B c between the TE 22,8 dominant and TE 19,9 dominant regions. Recently a numerical simulation including nonlinear interaction between oscillation modes has suggested the TE 3,16 mode is more likely as the mode corresponding to Beam 2 [28]. However, the oscillation frequency corresponding to these modes has not been identified yet.…”

Section: Discussionmentioning

confidence: 99%

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Performance Test of CW 300 GHz Gyrotron FU CW I

Saito

Nakano

Hoshizuki

et al. 2007

Int J Infrared Milli Waves

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A 300 GHz CW gyrotron FU CW I has been developed and installed in the Research Center for Development of Far-Infrared Region, University of Fukui as a power source of a high frequency material processing system. Its performance was tested and the maximum power of 1.75 kW / CW has been attained at the beam voltage of 15 kVand the beam current of 1A. The maximum window power efficiency of 15.5% has been obtained at the cathode voltage slightly lower than 15 kV. This gyrotron is designed to deliver a Gaussian beam after mode conversion from the oscillation mode TE 22,8 in the cavity with a complex of an internal radiator and beam shaping mirrors. The detailed measurement with an infrared camera has confirmed that a Gaussian beam is radiated when the magnetic field strength B c at the cavity is adjusted at a proper value. However, within a range of B c , the output power is emerged into multiple directions, which suggests simultaneous oscillation of competing cavity modes.

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Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Performance Test of CW 300 GHz Gyrotron FU CW I

Saito

Nakano

Hoshizuki

et al. 2007

Int J Infrared Milli Waves

Self Cite

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“…The first gyrotron, Gyrotron FU CW I, has already been developed. [20,21] The output frequency and power in CW operation are 300 GHz and 1.75 kW, respectively. The second gyrotron, Gyrotron FU CW II has also been constructed and tested.…”

Section: Discussionmentioning

confidence: 99%

“…The cavity mode is TE 22,8 at the fundamental operation. [20,21] The second gyrotron, Gyrotron FU CW II [14][15][16] was constructed and the operation test has been carried out. The principal designed cavity mode is TE 2,6 at the frequency of 394.6 GHz.…”

Section: Introductionmentioning

confidence: 99%

Long Pulse Operation of the THz Gyrotron with a Pulse Magnet

Idehara¹,

Saito²,

Mori³

et al. 2007

Int J Infrared Milli Waves

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Long pulse operation up to 1 msec of a high frequency gyrotron with a pulse magnet has been successfully carried out in a frequency range including 1 THz. In the experiments, the timing of an electron beam pulse injection is adjusted at the top of the magnetic field pulse, where the variation of field intensity is negligible. The operation cavity modes seem to be TE 1, 12 and TE 4,12 at the second harmonics. The corresponding frequencies are 903 GHz and 1,013 GHz, respectively. Additionally several features of radiation measurement results of the gyrotron are described and brief considerations are presented.

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Development and Applications of High—Frequency Gyrotrons in FIR FU Covering the sub-THz to THz Range

Idehara

Sabchevski

2012

J Infrared Milli Terahz Waves

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Powerful sources of coherent radiation in the sub-terahertz and in the terahertz frequency range of the electromagnetic spectrum are necessary for a great and continuously expanding number of applications in the physical research and in various advanced technological processes as well as in radars, communication systems, for remote sensing and inspection etc.. In recent years, a spectacular progress in the development of various gyrodevices and in particular of the powerful high frequency (sub-terahertz and 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 review paper we outline two series of such devices, namely the Gyrotron FU Series which includes pulsed gyrotrons and Gyrotron FU CW Series which consist of tubes operated in a CW (continuous wave) or long pulse mode, both developed at the FIR FU Center. 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.

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Simulation of Mode Interaction in the Gyrotron FU CW I

Cited by 9 publications

References 18 publications

Performance Test of CW 300 GHz Gyrotron FU CW I

Performance Test of CW 300 GHz Gyrotron FU CW I

Long Pulse Operation of the THz Gyrotron with a Pulse Magnet

Development and Applications of High—Frequency Gyrotrons in FIR FU Covering the sub-THz to THz Range

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