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大功率电子枪的新型LaB6阴极

A new type of cathode of high-power electron gun

  • 摘要: 轰击式LaB6阴极是一种电子枪的新型阴极,它不仅具有良好的电子光学系统结构,而且电子发射能力强大,对大功率电子枪的研制和开发具有重要意义。论述了新型轰击式LaB6阴极的工作原理、研究的意义、阴极材料的选择,并完成了轰击式阴极的设计和计算,设计完成了轰击式LaB6阴极的试验装置。通过试验得到,该轰击式LaB6阴极在阴极温度为1843 K时具有最大发射电流450 mA,其发射电流密度为3.58 A/cm2。列举了典型试验数据并进行分析,得到所选用的LaB6的发射常数A为2 1.33,逸出功Φs为2.6 eV,这与理论值非常接近,证明了试验的准确性和可靠性,该试验结果为大功率电子枪的研究开发、为大功率电子束焊接设备的研制奠定了基础。

     

    Abstract: The bombarded LaB6 cathode is a new type of cathode applied in the electron gun.It has not only a good structure in optics system,but also the powerful ability of emission and has a great important significance in developing and researching the high-power electron gun.The principle of the work,the significance of the study,the selection of the material of the cathode was dealt with in this paper.This task based on investigation has completed the design and calculation of bombarded cathode,it has designed and completed the experiment equipment of the bombarded LaB6 cathode.By the experiment,we found that the bombarded LaB6 cathode could get the maximum of emission current that is (450 mA,) when the cathode temperature got to 1 843 K.Moreover,by analyzing the datum of the experiment,we got the constant A of LaB6 emission that is 21.33 and the function Φs of it that is 2.6 eV,which are quite similar with the theoretic value,and proved the experiment had veracity and reliability.

     

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