SBIR Phase I: Diamond Microtips Field Emission Electron Source

这个小企业创新研究的第一阶段项目是开发一种强大的场发射电子源，使用金刚石微尖作为标准热丝阴极的替代品。该项目将使用在硅模具中生长的纳米晶体金刚石微尖来生产金刚石场发射源，直接替代许多科学仪器中使用的热丝阴极。该项目的第一阶段将测试金刚石微针尖作为电子冷场发射源的适用性，以取代电子枪中的热丝。该概念将首先通过用金刚石微尖代替电子枪中的热丝阴极并获得电子枪的初步操作参数（例如最大发射电流，发射电压等）来进行测试。这些信息将用于设计热丝电子枪的直接替代尖端。由于金刚石微针尖的有效功功能很低，所以大多数电子枪都采用Wehnelt电源作为提取电源。简单的场发射替代热丝电子枪的预期好处有很多，它们包括用于科学应用的高亮度“防烧坏”、低能量扩散电子枪，以及用于高分辨率电视显像管的坚固、小光斑尺寸电子枪。* * *

*** 9760843 Jamison This Small Business Innovation Research Phase I project is to develop a robust field emission electron source using diamond microtips as a replacement for standard hot filament cathodes. The project will use nanocrystaline diamond microtips grown in a silicon mold to produce diamond field emission sources that are direct replacements for hot filament cathodes used in many scientific instruments. Phase I of this project will test the applicability of diamond microtips for use as a cold field emission source of electrons to replace hot filaments in electron guns. The concept will first be tested by replacing the hot filament cathode in an electron gun by the diamond microtip and obtaining preliminary operating parameters (e.g. maximum emission current, emission voltage, etc.) for the gun. This information will then be used to design a direct replacement tip for hot filament electron guns. Because diamond microtips have a very low effective work function, the Wehnelt power supply in most electron guns should serve as the extractor supply. The anticipated benefits of simple field emission replacement for a hot filament electron gun are many, They range a high brightness "burn-out-proof", low energy spread electron gun for scientific applications, to robust, smaller spot size electron guns for high resolution TV tubes. ***