Scandate Dispenser Cathode Fabrication for A High-Aspect-Ratio High-Current-Density Sheet Beam Electron Gun
Scandate Dispenser Cathode Fabrication for A High-Aspect-Ratio High-Current-Density Sheet Beam Electron Gun
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DOI：
10.1109/ted.2012.2190294
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发表时间：
2012-04
影响因子：
3.1
通讯作者：
Jinfeng Zhao;D. Gamzina;Na Li;Ji Li;A. Spear;L. Barnett;M. Banducci;S. Risbud;N. Luhmann
中科院分区：
文献类型：
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作者：
Jinfeng Zhao;D. Gamzina;Na Li;Ji Li;A. Spear;L. Barnett;M. Banducci;S. Risbud;N. Luhmann
高电流密度钪酸盐钨分配器阴极用于演示国防高级研究计划局高频集成真空电子（HiFIVE）计划的25：1纵横比750 A/cm 2电流密度片束，该计划旨在实现宽带（~ 30%）220 GHz行波管。以1-2 μ m的钨粉为原料，添加纳米氧化钪，采用溶胶-凝胶法制备了具有均匀微观结构的椭圆形阴极，在1050 °C下电流密度可达160 A/cm 2。为了测试太赫兹片状电子束枪的性能，建立了一台片状电子束枪分析仪，用于测量由钪酸盐钨阴极产生的片状电子束的大小和电流密度。使用BVERI浸渍钪酸盐分配器阴极，在没有磁压缩的情况下，已经获得了具有12.5：1的纵横比和超过375 A/cm 2的电流密度的片状电子束;进一步的磁场压缩将给出750 A/cm 2的最终电流密度。
A high-current-density scandate tungsten dispenser cathode was used for the demonstration of a 25 : 1-aspect-ratio 750-A/cm2 -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 ( ~ 30%) 220-GHz traveling wave tube. The elliptical cathode with homogeneous microstructure was made from 1-2-μm-size tungsten powder added with nanosized Scandia using the sol-gel method; it has a current density of up to 160 A/cm2 at 1050 °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/cm2 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/cm2.