Electron Beam Formation, Focusing, and Collection in Microwave Tubes

True, R.B.

doi:10.1016/b978-0-08-052377-4.50018-8

Cited by 1 publication

(1 citation statement)

References 72 publications

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“…For a I-V curve at a certain temperature, the slope of the curve increases with increasing electric field, which is inconsistent with the Child-Langmuir law. According to the Child-Langmuir law, when a thermionic cathode is located in the space charge limited region, its log-log plot of voltage and emission current density is linear, where the theoretical slope of the curve is 1.5 [28]. As the accelerating voltage increases, the slope decreases when cathode emission transitions from the space charge limited region to the temperature limited region.…”

Section: Emission Characteristics Of Scandate Cathode With Micro-bladmentioning

confidence: 99%

Study on Low-Temperature Emission Performance of Scandate Cathode with Micro-Blade-Type Arrays

Yin

Zhang

et al. 2019

Materials

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In order to meet the requirements of high-frequency vacuum electronic devices with small size, high current density, and low working temperature, a kind of porous tungsten scandate cathode with micro-blade-type arrays was developed. The micro-blade-type arrays were fabricated by laser engraving technology. Subsequently, the cathode was prepared by a vacuum copper removal process and impregnated with active substances at high temperature. Experimental results show that the cathode exhibits excellent low-temperature electron emission performance and that the maximum pulse electron emission current density reaches 81.18 A/cm2 at 800 °C. The cathode also shows apparent combined thermal-field emission characteristics. Further analysis shows that a high electric field strength plays an important role in the electron emission of the scandate cathode. By virtue of the electric field enhancement effect formed by the fabricated micro-blade-type arrays on the cathode surface, the prepared cathode achieves high electron emission capacity.

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Section: Emission Characteristics Of Scandate Cathode With Micro-bladmentioning

confidence: 99%