Novel Field Emission Electron Source

研制了一种具有极低功函数的新型类金刚石碳涂层。使用专有的沉积方法，这种材料可以涂在各种金属和陶瓷部件上。该项目的第一阶段将测试该材料作为电子冷场发射源的适用性，以取代电子枪中的热丝。该概念将首先通过使用这种碳材料获得尖锐钨尖涂层的发射来进行测试，然后替换电子枪中的热丝阴极，最后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）。这些信息将用于设计热丝电子枪的直接替代尖端。由于这种材料的功函数很低，所以大多数电子枪中的Wehnelt电源都应该作为提取电源。

A novel diamond-like carbon coating has been developed that has an extremely low work function. Using a proprietary deposition method, this material can be coated on a variety of metal and ceramic parts. Phase I of this project will test the applicability of this material for use as a cold field emission source of electrons to replace hot filaments in electron guns. The concept will first be tested by obtaining emission from a sharp tungsten tip coating with this carbon material, then replacing the hot filament cathode in an electron gun, and finally 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. Since this material has a very low work function, the Wehnelt power supply in most electron guns should serve as the extractor supply.