High-power operation of a<i>K</i>-band second-harmonic gyroklystron

Lawson, W.; Matthews, H.; Lee, M. K. E.; Calame, J.P.; Hogan, B.; Cheng, J.; Latham, P.E.; Granatstein, V.L.; Reiser, M.

doi:10.1103/physrevlett.71.456

Cited by 50 publications

(9 citation statements)

References 16 publications

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“…An anechoic chamber was used to measure peak output power and mode purity. Previous comparisons with calorimetry measurements resulted in good agreement with the anechoic chamber measurements [11,12].…”

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confidence: 66%

High power operation of anX-band gyrotwistron

et al. 1994

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We report the first experimental verification of a gyrotwistron amplifier. The device utilized a single 9.858 0Hz, TED&z cavity, a heavily attenuated drift tube, and a long tapered output waveguide section. With a 440 kV, 200 -245 A, 1 ps electron beam and a sharply tapered axial magnetic field, peak powers above 21 MW were achieved with a gain near 24 dB. Performance was limited by competition from a fundamental TE&z mode. A multimode code was developed to analyze this system, and simulations were in good agreement with the experiment.PACS numbers: 85.10.Jz, 41.75.Ht Devices based on the cyclotron maser instability [1,2] have proven to be efficient, high power, high frequency rf sources (see, e. g. , [3]). Oscillator configurations in-

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confidence: 66%

High power operation of anX-band gyrotwistron

et al. 1994

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“…In these regimes the benefits from operation at cyclotron harmonics can be combined with the advantages of using available, relatively inexpensive, low-frequency, highpower drivers for input stages of such amplifiers. In recent years such frequency-multiplying operation of various gyroamplifiers was studied at the University of Maryland both experimentally [4][5][6] and theoretically. [7][8][9][10][11] One of the most promising large-bandwidth gyroamplifiers is the gyro-traveling-wave-tube ͑gyro-TWT͒.…”

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confidence: 99%

Analytical theory of frequency-multiplying gyro-traveling-wave-tubes

2001

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The theory is developed which describes analytically the gain and bandwidth in frequency-multiplying gyro-traveling-wave-tubes. In this theory the input waveguide is considered in the small-signal approximation. Then, in the drift region separating the input and output waveguides, the electron ballistic bunching evolves which causes the appearance in the electron current density of the harmonics of the signal frequency. The excitation of the output waveguide by one of these harmonics is considered in a specified current approximation. This makes the analytical study of a large-signal operation possible. The theory is illustrated by using it to analyze the performance of an existing experimental tube.

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“…11, and references therein͒. 15 The next step in elaborating the concept of frequency multiplication was made by H. Guo. 14, and references therein.͒ Also, small-orbit, frequency-doubling relativistic gyroklystrons with the efficiency of 30% and 30 MW peak power level were developed at the University of Maryland.…”

Section: Introductionmentioning

confidence: 99%

On the theory of frequency-quadrupling gyroklystrons

Savilov

Nusinovich

2007

Physics of Plasmas

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In this paper, frequency-quadrupling three-cavity gyroklystrons with successive frequency-doubling in each stage are considered. First, it is shown that such device operating in the W band at the TE 4,2 -mode can deliver up to 30 kW output power in the regime of stable amplification with the density of Ohmic losses acceptable for continuous-wave ͑cw͒ operation. The corresponding efficiency is in the range of 17%-20%. Then, the device is scaled to 0.5 THz frequency and optimized for operation at the TE 4,5 -mode. At this frequency, the frequency-quadrupling gyroklystron driven by the 60 kV electron beam with the beam current less than 1 A can deliver up to 1 kW power with acceptable Ohmic losses. The corresponding efficiency is in the range of 1%-2%.

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High-power operation of aK-band second-harmonic gyroklystron

Cited by 50 publications

References 16 publications

High power operation of anX-band gyrotwistron

High power operation of anX-band gyrotwistron

Analytical theory of frequency-multiplying gyro-traveling-wave-tubes

On the theory of frequency-quadrupling gyroklystrons

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