Demonstration of a Multikilowatt, Solenoidally Focused Sheet Beam Amplifier at 94 GHz

Pasour, John; Wright, E. L.; Nguyen, Khanh; Balkcum, Adam; Wood, F.; Myers, Robert E.; Levush, B.

doi:10.1109/ted.2013.2295771

Cited by 126 publications

(38 citation statements)

References 28 publications

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“…As it has been discussed in Section III, stability factors limit the gain of a gyro-TWT with a low-loss circuit to a value of less than 30 dB, so in order to reach high output power, the drive power should be sufficiently high. For this paper, we assume the power level of the input signal of 250 W, as a reasonable compromise between the power level of state of art and widely available linear-beam amplifiers [31], [32].…”

Section: Operating Regime Simulationmentioning

confidence: 99%

A Helical-Waveguide Gyro-TWT at the Third Cyclotron Harmonic

Mishakin

Samsonov

Денисов

2015

IEEE Trans. Electron Devices

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In this paper, we present a design of a broadband powerful W-band gyroamplifier with an interaction circuit in the form of a helically corrugated waveguide operating at the third cyclotron harmonic. An analysis of stability of the gyrotron traveling wave tube (gyro-TWT) with respect to parasitic wavebeam interactions at the operating and nonoperating cyclotron harmonics has been performed, and the range of parameters at which the gyro-TWT is zero-drive stable is found. Moreover, a comparison with a traditional smooth-waveguide gyro-TWT revealed that the helical-waveguide gyro-TWT possess superior stability characteristics at higher cyclotron harmonics. For a set of parameters attractive for possible applications, the 3-D particle-in-cell simulations were performed, according to which the proposed gyro-TWT yielded a 6% amplification bandwidth with the maximum output power of 80 kW and gain of 25 dB for a 10-A, 70-kV electron beam.

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Section: Operating Regime Simulationmentioning

confidence: 99%

A Helical-Waveguide Gyro-TWT at the Third Cyclotron Harmonic

Mishakin

Samsonov

Денисов

2015

IEEE Trans. Electron Devices

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“…A schematic of the planar multiple-beam extended interaction cavity of the RF circuit based on the barbell cavity type [8], [18], [19] is shown in Fig. 1.…”

Section: Rf Circuit Cavity Designmentioning

confidence: 99%

“…Recently, a breakthrough [8] has been reported that a sheet-beam extended-interaction klystron (EIK) yields an output power of 7.8 kW at 95 GHz with a relatively low operating voltage of about 20 kV. The extended-interaction technology using a multigap resonant cavity offers the advantages of high gain per unit length and short interaction circuit.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of a Planar Multiple-Beam Circuit for <inline-formula> <tex-math notation="LaTeX">$W$ </tex-math></inline-formula>-Band High-Power Extended-Interaction Klystron

Lü

Zhang

Wang

et al. 2015

IEEE Trans. Electron Devices

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Circuit analysis of a multiple-beam version of a high-power extended-interaction klystron is performed. The circuit is based on the barbell cavity with five coplanar electron beams across the transverse section of the cavity. Although the basic circuit design is straightforward, stable operation is challenging due to the mode competition and the self-oscillation in an oversized multiple-gap cavity driven by multiple beam sources. The 3-D particle-in-cell (PIC) simulation technology and the space-charge wave theory were exploited to analyze the stability. The physical design of the interaction system was accomplished with the beam parameters of voltage 19 kV and of overall current 4 A (0.8 A × 5). PIC results show that a power of 11.28 kW can be achieved at a frequency of 94.48 GHz with an instantaneous 3-dB bandwidth of 160 MHz. The corresponding gain and electric efficiency are 55.75 dB and 14.84%, respectively. IndexTerms-Barbell cavity, extended-interaction klystron (EIK), mode competition, particle-in-cell (PIC) simulation, planar multiple beams.

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“…In general, the electric field of middle gap is higher than the electric field of the sides, but the field amplitude difference is very small in input cavity of klystron. In addition, research results of [11] and [16] show that the electric field of every gap is able to reach same in the multigap barbell-shaped resonant cavity, so that we set the same electric field of every gap approximately to simplify the derivation of electron load conductance.…”

Section: B Derivation Of Electron Load Conductance Of Three-gap Extementioning

confidence: 99%

“…In particular, in recent years, the research about the sheet beam extended interaction klystron (SBEIK) becomes more and more important. The Naval Research Laboratory shows the latest experiment of demonstration of a W -band sheet beam EIK, which the experiment result shows the higher gain per unit in comparison to klystron for the same beam parameters and broader bandwidth capability than the condition klystron [11].…”

mentioning

confidence: 99%

Analysis and Simulation of a Multigap Sheet Beam Extended Interaction Relativistic Klystron Amplifier

Zhao

Huang

et al. 2015

IEEE Trans. Plasma Sci.

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To improve the output power and electron efficiency and broaden the operating bandwidth, the three-gap extended output cavity was used in the relativistic klystron to replace the single-gap output cavity. The high-frequency characteristics of the three-gap extended cavity were studied. The electron load conductance was derived and corrected based on the theory of relativity, by which a more accurate relation of electron load conductance versus transmit angle can be obtained. The characteristic impedance is three times bigger than that of the single-gap cavity under the case of the 2π mode, which can improve the M 2 (R/ Q) and the beam-wave interaction efficiency. The model of sheet beam klystron (SBK) is comprised of three-gap input cavity, two-gap first idler, three-gap second idler cavity, and three-gap output cavity. The 3-D particle-in-cell simulation results show that for a 500 kV, 1 kA, 40.134 GHz, and 20 W input power, the SBK is capable of generating an output power higher than 142 MW with the gain of 68.5 dB, maximum interaction efficiency of 28.4%, and 3-dB bandwidth of 240 MHz.Index Terms-Extended interaction, particle-in-cell (PIC) simulation, relativistic klystron, sheet beam.

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Demonstration of a Multikilowatt, Solenoidally Focused Sheet Beam Amplifier at 94 GHz

Cited by 126 publications

References 28 publications

A Helical-Waveguide Gyro-TWT at the Third Cyclotron Harmonic

A Helical-Waveguide Gyro-TWT at the Third Cyclotron Harmonic

Stability Analysis of a Planar Multiple-Beam Circuit for <inline-formula> <tex-math notation="LaTeX">$W$ </tex-math></inline-formula>-Band High-Power Extended-Interaction Klystron

Analysis and Simulation of a Multigap Sheet Beam Extended Interaction Relativistic Klystron Amplifier

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