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    • 41. 发明申请
    • Industrial hollow cathode with radiation shield structure
    • 工业用空心阴极与辐射屏蔽结构
    • US20060132017A1
    • 2006-06-22
    • US11339783
    • 2006-01-25
    • Harold KaufmanJames Kahn
    • Harold KaufmanJames Kahn
    • H01J1/20
    • H01J1/025H01J1/52
    • In accordance with one embodiment of the present invention, the hollow-cathode apparatus comprises a small-diameter tantalum tube with a plurality of tantalum-foil radiation shields, wherein the plurality of shields in turn comprise one or more spiral windings external to that tube and approximately flush with the open end from which electron emission takes place. The axial length of at least one of the inner windings (closer to the tantalum tube) is equal to or less than approximately half the length of the tantalum tube. An enclosed keeper surrounds the cathode. To start the cathode, a flow of ionizable inert gas, usually argon, is initiated through the cathode and out the open end. An electrical discharge is then started between the keeper and the hollow cathode. When heated to operating temperature, electrons exit from the open end of the hollow cathode.
    • 根据本发明的一个实施例,中空阴极装置包括具有多个钽箔辐射屏蔽的小直径钽管,其中多个屏蔽依次包括该管外部的一个或多个螺旋绕组,以及 大致与发生电子发射的开口端齐平。 内部绕组(更靠近钽管)中的至少一个的轴向长度等于或小于钽管的长度的大约一半。 封闭的门将围绕阴极。 为了启动阴极,通过阴极引出电离惰性气体(通常为氩气)流出开口端。 然后在保持器和中空阴极之间开始放电。 当加热到工作温度时,电子从空心阴极的开口端排出。