Submillimeter-wave gyrotrons: Theory and experiment

Flyagin, V.A.; Лучинин, А. Г.; Nusinovich, G. S.

doi:10.1007/bf01009400

Cited by 92 publications

(41 citation statements)

References 5 publications

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“…While gyrotrons deliver the highest average power in this band, there have been very few continuous-wave (CW) gyrotron experiments at high frequencies. Only six CW gyrotrons from University Sydney, Sydney, Australia [1], Fukui University, Fukui, Japan [2], Institute of Applied Physics (IAP) Russian Academy of Sciences (RAS), Nizhny Novgorod [3], [4], and Massachusetts Institute of Technology, Cambridge [5], [6] generate frequencies above 250 GHz at output powers ranging from a fraction of a watt to a kilowatt.…”

Section: Introductionmentioning

confidence: 99%

Continuous-wave operation of a 460-GHz second harmonic gyrotron oscillator

Hornstein

Bajaj

Griffin

et al. 2006

IEEE Trans. Plasma Sci.

135

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We report the regulated continuous-wave (CW) operation of a second harmonic gyrotron oscillator at output power levels of over 8 W (12.4 kV and 135 mA beam voltage and current) in the TE 0,6,1 mode near 460 GHz. The gyrotron also operates in the second harmonic TE 2,6,1 mode at 456 GHz and in the TE 2,3,1 fundamental mode at 233 GHz. CW operation was demonstrated for a one-hour period in the TE 0,6,1 mode with better than 1% power stability, where the power was regulated using feedback control. Nonlinear simulations of the gyrotron operation agree with the experimentally measured output power and radio-frequency (RF) efficiency when cavity ohmic losses are included in the analysis. The output radiation pattern was measured using a pyroelectric camera and is highly Gaussian, with an ellipticity of 4%. The 460-GHz gyrotron will serve as a millimeter-wave source for sensitivity-enhanced nuclear magnetic resonance (dynamic nuclear polarization) experiments at a magnetic field of 16.4 T.

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Section: Introductionmentioning

confidence: 99%

Continuous-wave operation of a 460-GHz second harmonic gyrotron oscillator

Hornstein

Bajaj

Griffin

et al. 2006

IEEE Trans. Plasma Sci.

135

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“…The frequency range of submillimeter waves is achieved in 1980s and 1990s by several gyrotrons in these institutions. [2][3][4][5][6][7] In the Research Center for Development of Far Infrared Region, University of Fukui (FIR FU), we have developed high frequency Gyrotron FU Series which consists of nine gyrotrons. Among them, in 1996, Gyrotron FU IVA achieved the frequency of 889 GHz with the output power of around 100 W. The frequency corresponds to the wavelength of 377 μm.…”

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confidence: 99%

Development of 394.6 GHz CW Gyrotron (Gyrotron FU CW II) for DNP/Proton-NMR at 600 MHz

Idehara

Ogawa

Agusu

et al. 2007

Int J Infrared Milli Waves

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Gyrotron FU CW II with an 8 T liquid He free superconducting magnet, the second gyrotron of the THz Gyrotron FU CW Series, has been constructed and the operation test was successfully carried out. It will be used for enhancing the sensitivity of 600 MHz proton-NMR by use of Dynamic Nuclear Polarization (DNP). The designed operation mode of the gyrotron is TE2,6 at the second harmonic. The corresponding frequency is 394.6 GHz. The real operation frequency is 394.3 GHz at TE06 mode, because of fabrication error of the diameter of the cavity. The operation is in complete CW at the output power of around 30 W or higher at the TE06 cavity mode. There are many other operation modes at the fundamental and the second harmonic. Typical output power of the fundamental and the second harmonic are higher than 100 W and 20 W, respectively. The highest frequency observed up to the present is 443.5 GHz at the second harmonic operation of TE6,5 mode. The measured results are compared with the theoretical consideration

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“…efficiency for a pulse duration of 100 usec, 7 and 645 kW at 140 GHz at 19% efficiency, with a peak efficiency of 24% at 300 kW for a pulse duration of 3 usec. 8 These devices have the potential for further development to achieve cw operation.…”

Section: Introductionmentioning

confidence: 99%

High peak power K a-band gyrotron oscillator experiment

Gold

Fliflet

Manheimer

et al. 1987

The Physics of Fluids

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A Ka- band gyrotron oscillator powered by a 600 kV pulse-line accelerator has produced approximately 100 MW at 35 GHz in a circular TE62 mode. It has also demonstrated frequency tuning over the range 28 to 49 GHz by operating in a family of TEm2 modes, with the azimuthal index m ranging from 4 to 10, by variation of the guide magnetic field. Operation is in general agreement with the predictions of theory.

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Submillimeter-wave gyrotrons: Theory and experiment

Cited by 92 publications

References 5 publications

Continuous-wave operation of a 460-GHz second harmonic gyrotron oscillator

Continuous-wave operation of a 460-GHz second harmonic gyrotron oscillator

Development of 394.6 GHz CW Gyrotron (Gyrotron FU CW II) for DNP/Proton-NMR at 600 MHz

High peak power K a-band gyrotron oscillator experiment

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