Demonstration of Marginal Stability Theory by a 200-kW Second-Harmonic Gyro-TWT Amplifier

Wang, Q. S.; McDermott, D.B.; Luhmann, Neville C.

doi:10.1103/physrevlett.75.4322

Cited by 71 publications

(31 citation statements)

References 14 publications

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“…No spurious oscillations for TE 11 and TE 21 mode were observed, a fact we attribute to the merits of using the mode converter/filter for TE 01 mode, But there was a reflection oscillation of a frequency 31 GHz with the peak power of~3 kW. We think that the oscillation is caused by the unmatched interaction circuit for the TE 01 mode.…”

Section: Measured Performancementioning

confidence: 75%

Experimental Study of a Ka Band Gyro-TWT with the Mode-Selective Circuits

Liu¹,

Wang²,

Liu³

et al. 2010

J Infrared Milli Terahz Waves

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The design and experimental study of a Ka-band gyrotron-travelling-wave tube (gyro-TWT) amplifier operating in the circular TE 01 mode at fundamental cyclotron harmonic are presented. A mode-selective technique was adopted in the interaction circuit of the gyro-TWT to suppress spurious modes TE 11 and TE 21 . A saturated peak power of 86 kW was obtained with saturated gain of 33 dB , an efficiency of 21.3%, in operating voltage 62 kV, electron current 6.5 A and -3 dB bandwidth of 2 GHz (~6%) .

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Section: Measured Performancementioning

confidence: 75%

Experimental Study of a Ka Band Gyro-TWT with the Mode-Selective Circuits

Liu¹,

Wang²,

Liu³

et al. 2010

J Infrared Milli Terahz Waves

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“…With the change in the vane-parameters, the cutoff frequency of the waveguide changes but not the shape of its dispersion characteristics. Since the loading of a cylindrical waveguide by vanes does not change the shape of the dispersion of the structure, such loading cannot broadband a gyro-TWT by widening the bandwidth of coalescence between the beam-mode dispersion line and the waveguide-mode dispersion hyperbola [16]. However, the operating frequency changed with vane-loading.…”

Section: Resultsmentioning

confidence: 98%

“…The size of the waveguide interaction structure of the gyro-TWT can be further increase by using the higher order modes in the waveguide. Although better performance has been demonstrated by the device operated in the fundamental (low order modes TE 01 [3] or TE 21 [16]) waveguide mode due to the better mode control and simpler coupler design, where as operation in the higher order modes are more attractive for the higher-power handling capability. The TE 01 mode exhibits the lowest ohmic dissipation, which can be important for the higher frequency operation [16].…”

Section: Introductionmentioning

confidence: 96%

“…It is based on the electron cyclotron resonance maser instability concept [1]. It is efficient, broadband, and has high-power handling capabilities compared to the conventional linear beam tubes, because it employs a oversized waveguide circuit supporting fast wave interactions [1]- [16]. The operating frequency of the device is chosen near the cutoff frequency of the waveguide at the grazing intersection between the beam-mode line and waveguide-mode hyperbola in the dispersion plot [4], [5].…”

Section: Introductionmentioning

confidence: 99%

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Gain and Bandwidth Analysis of a Vane-Loaded Gyro-TWT

Singh

Kartikeyan

Park

2006

Int J Infrared Milli Waves

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Theoretical investigation of the peak-gain and 3-dB bandwidth of the vane-loaded gyro-traveling wave tube (gyro-TWT) amplifier in the small-orbit TE 01 waveguide mode configuration at 35 GHz has been presented. The vane-loaded gyro-TWT enjoys higher gain and bandwidth compared to that of the smooth-wall device. In the analysis, the azimuthal harmonic effects generated due to the angular periodicity of vanes in the wedge-shaped metal vane-loaded cylindrical waveguide interaction structure have been taken into account in the cold (beam-absent) dispersion relation only.

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“…One way to increase I s is to apply loss to the gyro-TWT circuit. Calculation results of I s employing linear theory [2][3][4] and nonlinear theory [5] were reported for lossy gyro-TWT. However, using these methods require in-depth analysis on linear and nonlinear theories of gyro-TWT.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Start-Oscillation-Current for Lossy Gyrotron Traveling-Wave Tube (Gyro-TWT) Using Linear Traveling-Wave Tube (TWT) Parameter Conversions

Song¹

2013

JEMAA

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The start-oscillation-current of a gyro-TWT (gyrotron traveling-wave tube) determines the stable operating current level of the device. The amplifier is susceptible to oscillations when the operating current level is higher than the start-oscillation current. There are several ways of calculating the start-oscillation current, including using the linear and nonlinear theory of a gyro-TWT. In this paper, a simple way of determining the start-oscillation current of lossy gyro-TWT is introduced. The linear TWT parameters that include the effects of synchronism, loss, and gain, were converted to gyro-TWT parameters to calculate the start-oscillation-current. The dependence on magnetic field, loss, and beam alpha was investigated. Calculations were carried out for a V-band gyro-TWT for both operating and competing modes. The proposed method of calculating the start-oscillation current provides a simple and fast way to estimate the oscillation conditions and can be used for the design process of a gyro-TWT.

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Demonstration of Marginal Stability Theory by a 200-kW Second-Harmonic Gyro-TWT Amplifier

Cited by 71 publications

References 14 publications

Experimental Study of a Ka Band Gyro-TWT with the Mode-Selective Circuits

Experimental Study of a Ka Band Gyro-TWT with the Mode-Selective Circuits

Gain and Bandwidth Analysis of a Vane-Loaded Gyro-TWT

Calculation of Start-Oscillation-Current for Lossy Gyrotron Traveling-Wave Tube (Gyro-TWT) Using Linear Traveling-Wave Tube (TWT) Parameter Conversions

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