Filippov Sergey V, Dall'Agnol Fernando F, Popov Eugeni O, Kolosko Anatoly G, de Assis Thiago A
Ioffe Institute, 26 Politekhnicheskaya, St. Petersburg 194021, Russia.
Department of Exact Sciences and Education (CEE), Universidade Federal de Santa Catarina, Campus Blumenau, Rua Joao Pessoa, 2514, Velha, Blumenau 89036-004, SC, Brazil.
Ultramicroscopy. 2024 Dec;267:114049. doi: 10.1016/j.ultramic.2024.114049. Epub 2024 Sep 13.
One of the critical aspects in advancing high-brightness field emitter devices is determining the conditions under which single-tip emitters should be constructed to optimize their emission area. Recent experiments have explored varying the axis ratio ξ of the cap of a single-tip emitter, ranging from an oblate semi-spheroid to a prolate shape, mounted on a nearly cylindrical conducting body. In this work, we present a strategy, based on high-accuracy computer simulations using the finite element technique, to maximize the emission area of those single-tip emitters. Importantly, our findings indicate that the notional emission area achieves its maximum when the emitter's cap is adjusted to an oblate semi-spheroid with a characteristic axis ratio ξ≈0.85. We do a comparison of notional emission area as a function of ξ for an ellipsoidal emitter on a post and compare these results from other emitter configurations, which are feasible to fabricate.
推进高亮度场发射体器件的关键方面之一是确定构建单尖发射体以优化其发射面积的条件。最近的实验探索了改变安装在近乎圆柱形导电体上的单尖发射体帽的轴比ξ，范围从扁椭球体到长椭球体形状。在这项工作中，我们提出了一种基于使用有限元技术的高精度计算机模拟的策略，以最大化那些单尖发射体的发射面积。重要的是，我们的研究结果表明，当发射体的帽调整为特征轴比ξ≈0.85的扁椭球体时，理论发射面积达到最大值。我们比较了柱上椭球形发射体的理论发射面积作为ξ的函数，并将这些结果与其他可行制造的发射体配置的结果进行了比较。
