When an ion beam is injected into a tapered insulating capillary, the induced self-organized radial Coulomb potential in the capillary is able to focus the beam like an electrostatic lens. However, because of the continued accumulation of charge in the capillary, an equilibrium is rarely attained and the injected beam is eventually Coulomb blocked by the capillary's potential. We propose an original add-on to the capillary setup, which can be tested experimentally and which is expected to hinder the Coulomb blocking. We investigate numerically the benefits and limits of the modified capillary setup. We show how the intensity and emittance of the injected beam control the transmission rate through conically tapered capillaries. Our results indicate that the add-on succeeds to stabilize the asymptotic transmission rate for a larger range of beam intensities and emittances, while reaching a near optimal transmitted fraction up to 90%.

中文翻译：

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通过锥形玻璃毛细管稳定离子束传输

当将离子束注入锥形绝缘毛细管中时，在毛细管中感应出的自组织径向库仑电势就可以像静电透镜一样聚焦离子束。但是，由于毛细管中电荷的不断积累，很少达到平衡，并且最终注入的电子束被毛细管的电势挡住了库仑。我们为毛细管装置提出了一个原始的附件，该附件可以通过实验进行测试，并且有望阻止库仑阻塞。我们从数字上研究了改进的毛细管设置的好处和局限性。我们展示了注入束的强度和发射率如何控制圆锥形毛细管的传输速率。