Evaluations of electron current output from tungsten emitter arrays with Cs and CsI coatings are carried out. The approach is based on first-principles calculations of the material physics including evaluation of the internal potentials, electronic wavefunctions, tunneling probabilities, and work function to predict field emission currents. This is coupled to time-dependent kinetic simulations for the assessment of emitter array currents with an inclusion of many-body Coulomb contributions from the electron swarm, geometric field enhancements with shielding based on a line charge model and dynamic screening from the swarm. Our numerical evaluations for arrays with a hexagonal lattice show the expected role of field screening with reductions in emitter separation. For scaling with emitter number, the results indicate nearest neighbor separations of more than 2.5 times the emitter height, in keeping with previous reports.

中文翻译：

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包括空间电荷效应、功函数变化和筛选在内的铯涂层钨发射器阵列的电子电流评估

对具有 Cs 和 CsI 涂层的钨发射器阵列的电子电流输出进行了评估。该方法基于材料物理的第一性原理计算，包括评估内部电位、电子波函数、隧道概率和预测场发射电流的功函数。这与用于评估发射器阵列电流的瞬态动力学模拟相结合，其中包括来自电子群的多体库仑贡献、基于线电荷模型的具有屏蔽的几何场增强和来自群的动态屏蔽。我们对具有六边形晶格的阵列的数值评估显示了场屏蔽与减少发射极分离的预期作用。要使用发射器编号进行缩放，