低速高电荷态离子微束具有广泛的应用前景。锥形毛细管对离子聚焦效应的发现为实现结构简单、成本低、强流低速高电荷态离子微束提供了新的实用方法和技术。本项目将基于中国科学院近代物理研究所的320kV高电荷态离子综合研究平台，充分利用该平台能够提供强流低速高电荷态离子的特点，通过系统的实验测量和Monte-Carlo模拟，着重研究锥形毛细管对低速高电荷态离子的聚焦机制，明确管内壁自组织充放电机制和多次小角度散射机制在不同条件下的贡献；认清锥形毛细管材质、长度、出口内径、锥角与聚焦效应的关系，以及它们对出射束流流强、束斑尺寸和能量分散的影响，从而获取最佳的毛细管规格参数，实现高品质、低成本的强流低速高电荷态离子微束。

The slow highly charged ions (HCIs) microbeam has an extensive application prospect. The focusing effect of ions passing through a tapered capillary provides a new method to obtain slow HCIs microbeams with simple structure and low cost. Based on the 320 kV platform for multi-discipline research with highly charged ions at the Institute of Modern physics, Chinese Academy of Sciences, which is able to produce high-current slow HCI beam, the present proposal will devote particular attention to investigate the focusing mechanisms of slow HCIs passing through a tapered capillary systematically both in experiments and with the Monte-Carlo simulations. And then the relative importance of different mechanisms such as self-organized charging and discharging of the inner-wall and multiple small-angle scattering will be extracted in different experiment conditions. Emphasis will be given to unravel the depentence of the focusing effect on the dimension parameters of a capillary such as the material, length, outlet diameter and taper angle, as well as the influence of these parameters on the current, beam size and energy spread of the transmitted beam. Thus the optimum dimension parameters of a tapered capillary will be selected to produce high-current slow HCIs microbeams with high-quality but low cost.