本项目旨在通过实验手段测量研究高电荷态ECR离子源引出的束流品质，拟采取的方案是：首先利用Wien-filter将不同电荷态的离子筛选出来，然后利用单丝记录在不同螺线管透镜（安装在离子源引出口）强度下的束流包络，利用矩阵方法，近似推算束流在引出口的发射度。本项目的研究将有助于更加深刻地认识离子源束流品质的形成机制，为离子源的最佳运行和束流的高效传输提供有力的理论技术支持，同时，为原有装置束流传输线改造与新装置的束流线优化设计提供可靠依据。

In order to study the beam quality of multi-species ion beams extracted from high charge state ECR ion source, a so called wien-filter with single wire device will be employed to measure the beam emittance at the exit of the ion source. The wien-filter is used to separate the ions with different Q/A, and the single wire is used to detect the beam envelope. By adjusting the current of the solenoid lens, which is placed just after the ion source exit, different beam envelopes will be recorded and then beam emittance can be calculated by using matrix method. With the project study, it is helpful to improve the understanding of the formation mechanism of the beam quality and to provide a strong support to the optimized commissioning of the ion source and efficient transmission of the beam both in theory and technology. Meanwhile, the project study will provide a basis for the existing beam line modification and new line design.