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

Content Provider	Springer Nature Link
Author	Gunin, A. V. Landl’, V. F. Korovin, S. D. Mesyats, G. A. Rostov, V. V.
Copyright Year	1999
Abstract	The operation of cold explosive-emission cathodes having a current density of ∼10$^{4}$ A/cm$^{2}$, fabricated using various materials, was investigated under a large number of switching cycles. The cathode voltage was ∼500 kV, the maximum current ∼5 kA, and the pulse duration ∼20 ns. It is shown that when the number of switchings is small (⩽10$^{3}$ pulses), cathodes having similar geometry exhibit similar emission properties. For most of the materials studied, as the number of switching cycles increases (⩾10$^{3}$ pulses), the current rise time increases (as far as the pulse duration) and the maximum vacuum diode current decreases. When a graphite cathode was used, the maximum current remained unchanged up to 10$^{8}$ switching cycles. The mass removed from the cathode was determined for various materials. The results were used to achieve continuous operation of a relativistic 3 cm backward-wave tube having an output power of 350–400MW and an almost constant power level during 10$^{8}$ pulses at a repetition frequency of 100–150 Hz.
Starting Page	922
Ending Page	926
Page Count	5
File Format	PDF
ISSN	10637850
Journal	Technical Physics Letters
Volume Number	25
Issue Number	11
e-ISSN	10906533
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	1999-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanics, Fluids, Thermodynamics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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