Gas-filled neutron tubes generating pulses with specified parameters are needed for neutron well-logging. These parameters are affected most by the ion-pulse shape. The results of numerical modeling of the dynamics of the electron beam, secondary ions, and electrons generated in the volume of the Penning ion source with an electron emitter and their effect on the ion-pulse parameters are examined. The calculation was performed in an axisymmetric geometry with the aid of the KARAT software package. The physical processes occurring in the ion source and their influence on the growth of the ion current extracted from the plasma as a function of the maximum current of the injected electrons and the geometry of their source were analyzed. It was found that the steady-state ion current is independent of the electron current and is mostly due to the geometry and radius of the electron beam.

中文翻译：

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发光离子脉冲源的电子发射器参数对提取电流的影响

中子测井需要充气中子管产生具有指定参数的脉冲。这些参数受离子脉冲形状的影响最大。检查了电子束、二次离子和在具有电子发射器的 Penning 离子源的体积中产生的电子的动力学的数值建模结果及其对离子脉冲参数的影响。借助 KARAT 软件包在轴对称几何中进行计算。分析了离子源中发生的物理过程及其对从等离子体中提取的离子电流增长的影响，作为注入电子的最大电流及其源几何形状的函数。