Scandate Dispenser Cathode Fabrication for A High-Aspect-Ratio High-Current-Density Sheet Beam Electron Gun

被引：56

作者：

Zhao, Jinfeng ^{[1
]}

Gamzina, Diana ^{[1
]}

Li, Na ^{[2
]}

Li, Ji ^{[2
]}

Spear, Alexander G. ^{[1
]}

Barnett, Larry ^{[1
]}

Banducci, Mike ^{[1
]}

Risbud, Subhash ^{[3
]}

Luhmann, Neville C., Jr. ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA

[2] Beijing Vacuum Elect Res Inst, Beijing 100015, Peoples R China

[3] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

来源：

IEEE TRANSACTIONS ON ELECTRON DEVICES | 2012年 / 59卷 / 06期

关键词：

Electron gun analyzer; high current density; scandate dispenser cathode; sheet beam; PERFORMANCE; EMISSION;

D O I：

10.1109/TED.2012.2190294

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A high-current-density scandate tungsten dispenser cathode was used for the demonstration of a 25 : 1-aspect-ratio 750-A/cm(2)-current-density sheet beam for the Defence Advanced Research Project Agency High-Frequency Integrated Vacuum Electronics (HiFIVE) program intended for the realization of a wideband (similar to 30%) 220-GHz traveling wave tube. The elliptical cathode with homogeneous microstructure was made from 1-2-mu m-size tungsten powder added with nanosized Scandia using the sol-gel method; it has a current density of up to 160 A/cm(2) at 1050 degrees C. A sheet beam gun analyzer was built to test the terahertz sheet beam gun and determine the size and current density of a sheet electron beam produced by the impregnated scandate tungsten dispenser cathode. A sheet electron beam with an aspect ratio of 12.5 : 1 with a current density exceeding 375 A/cm(2) has been obtained using a BVERI impregnated scandate dispenser cathode without magnetic compression; further magnetic field compression would give the final current density of 750 A/cm(2).

引用

页码：1792 / 1798

页数：7

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