Design of a high-power, high-gain, 2nd harmonic, 22.848 GHz gyroklystron

Veale, Matthew C.; Purohit, P.; Lawson, W.

doi:10.1063/1.4820387

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…[1][2][3][4] The extended interaction klystron (EIK) is one device that is important amongst the various categories of VEDs because it improves the power capacity and reduces the risk of breakdown in the microwave and millimeter wave regimes. [5][6][7] The EIK usually comprises series of multi-gap cavities, which distribute the intense electric field into adjacent gaps and enhance the circuit impedance. 8 As a reliable and portable device, the EIK has attracted considerable attention in the terahertz frequency range.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of matching conditions and optimum structure of an input coupler for a 0.34-THz extended-interaction klystron

Wang

2017

AIP Advances

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To develop a reliable and stable EIK at 0.34 THz, an analysis of the input circuit is presented and some aspects regarding the practicalities of the device are specifically discussed. The structure of the coupler is first optimized to improve the driving signal injection. The effects of gap voltage on the beam-wave interaction are studied, leading to the evaluation of the driving power needed. By analyzing the currently available seed sources and the possibility of electrical breakdown, proper input conditions are established. Finally, an optimized input circuit is shown to match well the simulation results obtained by using the particle-in-cell (PIC) method. The simulation results demonstrate that the optimized device can operate stably with a gain of 28.8 dB when the input power is matched at 7.9 mW.

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Section: Introductionmentioning

confidence: 99%

Numerical study of matching conditions and optimum structure of an input coupler for a 0.34-THz extended-interaction klystron

Wang

2017

AIP Advances

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Demonstration of efficient beam-wave interaction for a MW-level 48 GHz gyroklystron amplifier

Nix

Zhang

et al. 2020

Physics of Plasmas

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The development of high-frequency RF linear accelerators (linacs) requires consideration of several technological challenges, such as electron bunch linearization. Presented in this paper is the design of the interaction circuit for a 48 GHz MW-level three-cavity gyroklystron amplifier, appropriate for application as a millimeter wave power source in a 4 th harmonic linearizing system for an X-band linac. The output cavity is operated at the cylindrical TE0,2,1 mode, while the input and buncher cavities are operated at the TE0,1,1 mode. The interaction circuit has been designed using a combination of analytical calculations and particle-in-cell (PIC) simulations. The optimized gyroklystron is shown, through simulation, to deliver an output power of up to 2.3 MW with gain of 36 dB and efficiency of 44% at 48 GHz, when driven by a 140 kV, 37 A electron beam.

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Increasing the bandwidth of an extended interaction klystron at 0.34 THz by staggered tuning of the multi-gap cavities

Wang

Teng

2018

EPL

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To increase the bandwidth of EIKs at 0.34 THz, a synthetical method containing several steps is proposed. As the crucial unit determining the performance of EIKs, the output cavity is studied. Based on the theory of space charge wave, the number of gaps in the output cavity is optimized to increase both the interaction efficiency and the instantaneous bandwidth. The approaches of tuning the shape of a barbell gap and the number of gaps in idler cavities are studied, leading to the practicable method of staggered tuning on all the intermediate cavities. As a result, the bandwidth of an EIK is improved step by step. Another approach of adjusting the drift tubes is also discussed and the synthetically tuning strategy for terahertz EIKs is concluded. Finally, the optimized nonuniform structure is verified by PIC simulations and the results show that it can effectively broaden the −3 dB bandwidth up to 500 MHz, which is double that of the uniform structure. The synthetical method is proved to be practicable in tuning the bandwidth and capable to keep the device operating in stability.

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Design of a high-power, high-gain, 2nd harmonic, 22.848 GHz gyroklystron

Cited by 3 publications

References 17 publications

Numerical study of matching conditions and optimum structure of an input coupler for a 0.34-THz extended-interaction klystron

Numerical study of matching conditions and optimum structure of an input coupler for a 0.34-THz extended-interaction klystron

Demonstration of efficient beam-wave interaction for a MW-level 48 GHz gyroklystron amplifier

Increasing the bandwidth of an extended interaction klystron at 0.34 THz by staggered tuning of the multi-gap cavities

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