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Abstract：
Since the cathodes with concave surfaces are required for the practical applications in most high-power vacuum electron devices, characteristics of nanosized-Scandia Doped Dispenser (SDD) cathodes with concave surfaces have been investigated, especially in dc applications. A space charge-limited (SCL) dc current density of over 50 A/cm2 has been measured at 1000 °Cb. An on-going life test with a dc load of up to 40 A/cm2 at 970 °Cb has been completed about 3000 hours of operation to date. The emission performance of the cathode was further evaluated in an electron gun test tube, which is a part of an mm wave CW-TWT, before the practical application in the real devices. © 2015 IEEE.
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Proceedings of 2015 IEEE International Vacuum Electronics Conference, IVEC 2015
Year： 2015
Language： English
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ESI Highly Cited Papers on the List： 0 Unfold All
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30 Days PV： 2
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