Study and Investigation Leading to the Design of Broadband High-Power Klystron Amplifiers

Lien, E.L.; Robinson, Darrell

doi:10.21236/ad0818491

Cited by 3 publications

(5 citation statements)

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“…Using the phase computed by (10) and the coupling constants, the electric field distribution and the beam-loading conductance can be obtained. Fig.…”

Section: Stability Analysismentioning

confidence: 99%

“…An axial extension of the interaction region by use of the multi-gap cavity [2][3][4][5][6][7][8][9][10] is suggested by Chodorow [3] and Wessel-Berg [4][5] in the early 1960s. They analyzed the behavior of the multi-gap cavity with extended interaction fields based on space charge theory.…”

Section: Introductionmentioning

confidence: 99%

“…Preist and Leidigh [6][7] discussed the stability of the extended interaction cavity which is a major limitation of the improvement in performance and the behavior of the stability parameter of the tube is dominated by variations in the loaded quality factor . Lien and Robinson [8][9][10] analyzed the stability of a double-gap coupled output cavity based on an equivalent circuit. The multi-gap cavity has not only higher ⁄ , which leads to a wider bandwidth and a higher circuit efficiency relative to the conventional klystron, but also a large surface reducing the RF gradient and the danger of RF breakdown.…”

Section: Introductionmentioning

confidence: 99%

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Stability analysis of a C-band 500-kW klystron with a multi-cell output cavity

Hwang

Park

Namkung

et al. 2016

Journal of the Korean Physical Society

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A prototype 5-GHz 500-kW CW klystron (model E3762 provided by Toshiba Electron Tubes & Devices Co. Ltd.) has been operating as the RF source for the lower hybrid current drive (LHCD) system in the KSTAR tokamak. In order to investigate how the efficiency of the 5-GHz 500-kW CW klystron prototype could be enhanced, the cavity design study is being carried out with simulation code based on the main klystron operation parameters. This is being done by simulating klystron performances for various cavity parameters including the number of cavities, inter-cavity distance, and cavity tuning frequencies. The simulation has been done with the FCI (field charge interaction) code aided by a matlab script for scanning input parameters. Initial set of scan parameters was obtained by benchmarking the E3762 klystron. It was possible to obtain optimized design parameters with better efficiency for a cavity system adopting a multi-cell output cavity. However, the multi-cell output cavity is prone to produce a self-oscillation due to the prolonged (several half RF periods) beam-field interaction along its multiple gaps. We have 2 checked the feasibility of the optimization by evaluating the stability of output cavity system. The stability is given by the ratio of a beam-loading conductance to the circuit conductance.

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“…Using the phase computed by (10) and the coupling constants, the electric field distribution and the beam-loading conductance can be obtained. Fig.…”

Section: Stability Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stability analysis of a C-band 500-kW klystron with a multi-cell output cavity

Hwang

Park

Namkung

et al. 2016

Journal of the Korean Physical Society

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show abstract

“…-11- 4 It should be pointed out that equal but opposite changes in e, at one frequency wI I not produce the same effect on the output power over the entire frequency range of the response because of the frequency dependence of 0o. When 82 is less than -n, e2 approaches it, and the lower-frequency mode is favored more, as the frequency decreases.…”

mentioning

confidence: 99%