Long-lived explosive-emission cathode for high-power microwave radiation generators

Gunin, A. V.; Landl, V.F.; Korovin, S. D.; Mesyats, G.; Rostov, V. V.

doi:10.1134/1.1262685

Cited by 32 publications

(6 citation statements)

References 3 publications

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“…Our experiment results agree well with the conclusion of Gunin [11]. According to their investigation results, the lifetime of pyrolytic graphite and metal-dielectric complex cathode are more than 10 6 pulses with 10 4 A/cm 2 current density.…”

Section: Experiments Of Complex Cathode Emissionsupporting

confidence: 91%

Study of Complex Cathode Emission Characters

Zhang¹,

Song²,

Fang³

2009

Acta Phys. Pol. A

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Based on the study of explosive emission, the dielectric enhanced electric-field emission model is brought forward, and the metal-dielectric complex cathode material is manufactured. Based on the investigation of surface-flashover explosive emission, the graphite-carbon fiber complex cathode is manufactured, too. Then the experiments are developed respectively, and the results show the electron emission density of these two complex cathode materials is also more than 17 kA/cm 2 , and their lifetime is exceeding 10 5 pulses.

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Section: Experiments Of Complex Cathode Emissionsupporting

confidence: 91%

Study of Complex Cathode Emission Characters

Zhang¹,

Song²,

Fang³

2009

Acta Phys. Pol. A

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“…However, the pattern of injection was restored (both in vacuum and in the gas) upon mechanical regeneration of the microrelief on the cathode edge. An analogous pattern with increasing delay of the beam injection, but upon a much longer training period, was also observed for a graphite cathode, in agreement with the previous data [7,8]. It can be ascertained that, in addition to the value of a macroscopic field at the cathode, the field enhancement on inhomogeneities of the surface microrelief is also a critical condition for the current injection in a gas-filled gap, which confirms the cold-emission nature of the electron bunch initiation [3].…”

Section: Electron Source and Acceleration Regime Of A Picosecond Elecsupporting

confidence: 91%

10.1007/s11455-008-2025-3

2010

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It is experimentally demonstrated that, upon the application of a subnanosecond high-voltage pulse to the gap of a diode filled with air at atmospheric pressure, a bunch of runaway electrons is formed in a sharply inhomogeneous electric field near the cathode. The bunch duration does not exceed 50 ps, which is shorter than the electron flight time through the interelectrode gap in the continuous acceleration regime. This duration remained unchanged when the gap width was varied between 6 and 26 mm. The electron energy in the picosecond electron beam, as determined from the time-of-flight measurements in the drift channel behind the anode foil of the diode, agree with the results of numerical calculations of the electron acceleration dynamics in the vacuum diode approximation.

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“…In the earlier investigations, metal [8], metal-ceramic [9], velvet [10], graphite [11], and carbon fiber [12], [13] have been studied as EEE cathode materials. Due to the high emission threshold and long emission delay [14], the metal EEE cathode has hardly appeared in recent studies. The metalceramic cathode has a long life, but the emission current is low [15], and its practicability in the RM has yet to be developed.…”

Section: Introductionmentioning

confidence: 99%

Study on Flake Graphite Cathode Surface Microstructure in Relativistic Magnetrons

Chen

Jiang²,

Yang

et al. 2023

IEEE J. Electron Devices Soc.

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Flake graphite has excellent explosive electron emission performance for its plenty surface micro-bulges and high graphitization degree, but its advantages have rarely been studied in relativistic magnetrons. In this paper, flake graphite cathodes with different fineness were used in coaxial diodes and relativistic magnetrons, and the influence of the surface microstructure of the flake graphite cathode on the relativistic magnetron performance is demonstrated for the first time. The result showed that the graphite microstructure mainly affected the initiation stage of explosive emission. Moreover, the delay time is determined by the degree of graphitization and the surface microstructure of graphite, and the surface microstructure plays a major role. Under the applied voltage of ∼ 330kV-∼ 490kV, The finer flake graphite possessed a shorter emission delay and facilitated the microwave excitation. The excitation time of finer flake graphite is ∼ 3ns, and ∼ 5ns for lager flake graphite. After several operations of the relativistic magnetron, the edges of flake graphite were blunted, and the surface of the flake graphite appeared droplet-like areas formed by anode atom sputtering. This work reveals the advantages of the finer flake graphite cathode in the fast priming of the relativistic magnetron, thus shedding new light on cathode design of the relativistic magnetron.

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Long-lived explosive-emission cathode for high-power microwave radiation generators

Cited by 32 publications

References 3 publications

Study of Complex Cathode Emission Characters

Study of Complex Cathode Emission Characters

10.1007/s11455-008-2025-3

Study on Flake Graphite Cathode Surface Microstructure in Relativistic Magnetrons

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