Design and 3-D Simulations of a 10-kW/28-GHz Gyrotron With a Segmented Emitter Based on Controlled Porosity-Reservoir Cathodes

Malygin, Anton; Illy, S.; Pagonakis, I.; Piosczyk, B.; Kern, Stefan; Weggen, Joerg; Thumm, M.; Jelonnek, John; Avramides, K.A.; Ives, R. Lawrence; Marsden, David; Collins, George

doi:10.1109/tps.2013.2255069

Cited by 11 publications

(4 citation statements)

References 6 publications

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“…For this study, possible instabilities of such a non-axisymmetric electron beam are not considered. The idea is to disable (e.g., coat) one sector of the emitter ring or use a segmented gyrotron emitter, 18 so that there is no electron at a certain azimuthal angle. Aligning this angle to the straight gap (taking into account also the azimuthal drift inside a gyrotron), there should be no electron at that angle in the collector, and thus, no electron would be reflected.…”

Section: E Further Investigation: Segmented Electron Beammentioning

confidence: 99%

Gyrotron multistage depressed collector based on E × B drift concept using azimuthal electric field. II: Upgraded designs

Pagonakis

Albert

et al. 2019

Physics of Plasmas

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Multistage Depressed Collectors (MDCs) are nontrivial for high-frequency gyrotrons. A basic conceptual design of an E Â B MDC using azimuthal electric fields was proposed in Part I of this series. In the present work, several upgraded design proposals based on the basic one will be elaborated. These proposals will significantly reduce the back-stream of electrons, which was the main drawback of the basic design proposal. Another upgraded design proposal will shrink the length and maximal radius of the MDC to be only a fraction of its full-length version. A conceptual design of the final MDC proposal will be given at the end.Published under license by AIP Publishing. https://doi.

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Section: E Further Investigation: Segmented Electron Beammentioning

confidence: 99%

Gyrotron multistage depressed collector based on E × B drift concept using azimuthal electric field. II: Upgraded designs

Pagonakis

Albert

et al. 2019

Physics of Plasmas

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“…and the drift distance D are inversely proportional to the magnitude of the magnetic field. 14 For a low-frequency gyrotron like a 28 GHz industrial gyrotron, 17 where the magnetic field is weak, only a small size is required for such an E Â B MDC to obtain enough drift. In that case, the magnetic field in the collector can be kept homogeneous (pure axial) as idealized in Fig.…”

Section: A Principlementioning

confidence: 99%

Gyrotron multistage depressed collector based on E × B drift concept using azimuthal electric field. I. Basic design

et al. 2018

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Multistage Depressed Collectors (MDCs) are widely used in vacuum tubes to regain energy from the depleted electron beam. However, the design of an MDC for gyrotrons, especially for those deployed in fusion experiments and future power plants, is not trivial. Since gyrotrons require relatively high magnetic fields, their hollow annular electron beam is magnetically confined in the collector. In such a moderate magnetic field, the MDC concept based on E Â B drift is very promising. Several concrete design approaches based on the E Â B concept have been proposed. This paper presents a realizable design of a two-stage depressed collector based on the E Â B concept. A collector efficiency of 77% is achievable, which will be able to increase the total gyrotron efficiency from currently 50% to more than 60%. Secondary electrons reduce the efficiency only by 1%. Moreover, the collector efficiency is resilient to the change of beam current (i.e., space charge repulsion) and beam misalignment as well as magnetic field perturbations. Therefore, compared to other E Â B conceptual designs, this design approach is promising and fairly feasible.

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“…Таким образом, проведенный численный анализ показывает существенное влияние нарушений азимутальной симметрии винтового электронного пучка на режим генерации субтерагерцового гиротрона, значительное большее, чем было предсказано в [24] для длинноволновых гиротронов, используемых, например, в технологиче-Рис. 3.…”

Section: в итоге эффективный фактор связи будет иметь видunclassified

Влияние Азимутальной Несимметрии Электронно-Волнового Взаимодействия На Характеристики Излучения Гиротронов Субтерагерцового Диапазона

Глявин¹,

Ран»²,

Заславский³

et al. 2015

AND

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Design and 3-D Simulations of a 10-kW/28-GHz Gyrotron With a Segmented Emitter Based on Controlled Porosity-Reservoir Cathodes

Cited by 11 publications

References 6 publications

Gyrotron multistage depressed collector based on E × B drift concept using azimuthal electric field. II: Upgraded designs

Gyrotron multistage depressed collector based on E × B drift concept using azimuthal electric field. II: Upgraded designs

Gyrotron multistage depressed collector based on E × B drift concept using azimuthal electric field. I. Basic design

Влияние Азимутальной Несимметрии Электронно-Волнового Взаимодействия На Характеристики Излучения Гиротронов Субтерагерцового Диапазона

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