ELECTRON-BEAM DIODES USING FERROELECTRIC CATHODES

被引：61

作者：

IVERS, JD ^{[1
]}

SCHACHTER, L ^{[1
]}

NATION, JA ^{[1
]}

KERSLICK, GS ^{[1
]}

ADVANI, R ^{[1
]}

机构：

[1] CORNELL UNIV,SCH ELECT ENGN,ITHACA,NY 14853

来源：

JOURNAL OF APPLIED PHYSICS | 1993年 / 73卷 / 06期

关键词：

D O I：

10.1063/1.353062

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A new high-current density electron source is described. The source consists of a polarized ferroelectric ceramic disk with silver electrodes coated on both faces. The front electrode consists of a periodic silver grid alternating with exposed ceramic. A rapid change in the polarization state of the ceramic results in the emission of a high-density electron cloud into a 1-10-mm accelerating diode gap. The anode potential is maintained by a charged transmission line. Some of the emitted electrons traverse the gap and an electron current flows. The emitted electron current has been measured as a function of the gap spacing and the anode potential. Current densities in excess of 70 A/cm2 have been measured. The current is found to vary linearly with the anode voltage for gaps < 10 mm, and typically exceeds the Child-Langmuir current density by at least two orders of magnitude. The experimental data is compared with predictions from a model in which the electrons emitted from the ferroelectric reflex in the diode gap.

引用

页码：2667 / 2671

页数：5