Theoretical and experimental investigation of a high-harmonic gyro-traveling-wave-tube amplifier

Ds, Furuno; Db, McDermott; Cs, Kou; Nc, Luhmann; Vitello, P.

doi:10.1103/physrevlett.62.1314

Cited by 33 publications

(6 citation statements)

References 6 publications

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“…The operation at the high harmonics relaxes not only the requirement of large magnetic field but also weakens beam-wave interaction and increase start oscillation current, and hence permitting large beam currents for the high-power and stable operation of the gyro-TWT [2], [3], [11]- [14]. However, it has also been recognized that high-cyclotron harmonic operation would require an electron beam with high-beam energy [11], [12]. Furthermore, the use of the highly relativistic beam would lead to difficulties in mode competition as exemplified in previous theories [14] and experiments [15].…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

Singh

Kartikeyan

Park

2006

Int J Infrared Milli Waves

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“…Harmonic operation of gyrotron, effectively reducing the strength of the magnetic field, has been of growing interest. [19][20][21][22][23] However, it is subject to severe mode competition as well as high oscillation threshold. Figure 1͑a͒ shows the frequency-k z diagram of a Ka-band TE 21 second-harmonic gyro-BWO.…”

Section: Introductionmentioning

confidence: 99%

A TE21 second-harmonic gyrotron backward-wave oscillator with slotted structure

Chen¹,

Yu²,

Chang³

2007

Physics of Plasmas

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Second-harmonic gyrotron backward-wave oscillator ͑gyro-BWO͒ with a reduced magnetic field strength is a tunable source in the millimeter wave regime, but it has long been impeded by the severe mode competition as a result of low efficiency and narrow bandwidth. This study employs a slotted structure functioning as a mode selective circuit to suppress the lower order transverse modes. In addition, a two-step tapered waveguide is adopted to stabilize the higher-order transverse modes and axial modes. Some important characteristics of the slotted gyro-BWO will be analyzed and discussed. As a calculated result, the interaction efficiency is improved and the stable tuning range is broadened. A stable, Ka-band, slotted second-harmonic gyro-BWO is capable of producing an efficiency of 23% with a 3 dB tuning bandwidth of 9% at 5 A and 100 kV.

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“…[1][2][3][4] The gyrotron backward-wave oscillator (gyro-BWO) is a promising source of coherent millimeter-wave radiation based on the electron cyclotron maser instability on a backward waveguide mode. [1][2][3][4] The gyrotron backward-wave oscillator (gyro-BWO) is a promising source of coherent millimeter-wave radiation based on the electron cyclotron maser instability on a backward waveguide mode.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of gyrotron backward-wave oscillators operating at different cyclotron harmonics

Yeh

Chang

2004

Physics of Plasmas

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A comparative analysis between the fundamental and second cyclotron harmonics of gyrotron backward-wave oscillators (gyro-BWOs) is presented. The simulation results reveal that nonlinear field contraction is a common feature for both harmonic interactions. Besides, the electron transit angle, used to characterize the axial modes of the fundamental harmonic TE11 mode at the start-oscillation conditions, is found to be applicable even for the second harmonic TE21 mode. Each axial mode of either the fundamental harmonic TE11 or the second harmonic TE21 modes is maintained at a constant value of the electron transit angle while changing the operating parameters, such as magnetic field and beam voltage. Extensive numerical calculations are conducted for the start-oscillation currents and tuning properties. Moreover, single-mode operating regimes are suggested where the second harmonic TE21 gyro-BWO could generate a considerable output power, comparing with the fundamental harmonic TE11 gyro-BWO.

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Theoretical and experimental investigation of a high-harmonic gyro-traveling-wave-tube amplifier

Cited by 33 publications

References 6 publications

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

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

A TE21 second-harmonic gyrotron backward-wave oscillator with slotted structure

Comparative analysis of gyrotron backward-wave oscillators operating at different cyclotron harmonics

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