重离子直线加速器在重离子治疗、航空航天、工农业生产、基础科学研究等领域都有着重要的应用，其中IH-DTL被广泛应用到重离子直线加速器中。KONUS或APF是国际上主流的IH-DTL动力学设计方案。本申请拟通过采用将电磁四极磁铁安装在漂移管内部的方式，提出新的且可以推广的强流IH-DTL动力学方案（IH-EMQ），可以适用于设计不同加速能量、用于加速不同荷质比的粒子，该方案具有横向聚焦强、出口能散小、发射度增长小、极限流强高等特点。基于IH-EMQ动力学方案，进行物理设计的优化，包括动力学设计优化以及RF设计优化，以设计出一个IH-DTL，并总结出适用于本方案的优化设计的方法和步骤。在物理设计完成的基础上，建立模型腔模型并进行模型腔的研制工作，通过对模型腔的冷测、调场实验结果与模拟结果对比，验证本设计方案的RF设计。

Heavy-ion linacs have important applications in heavy-ion therapy, aerospace, industrial and agricultural production, basic scientific research and other fields. Interdigital-mode drift-tube linacs (IH-DTL) are widely used in heavy-ion linacs. Combined Zero-Degree Structure (KONUS) and Alternating-Phase-Focused (APF) are the mainstream IH-DTL beam dynamic design schemes in the world. A new and extensible high-current IH-DTL beam dynamic scheme (IH-EMQ) will be proposed in this application by installing the electromagnetic quadrupole magnet inside the drift tubes which can be applied to accelerate particles with different energies and different charge-mass ratios. The scheme has the advantages of strong transverse focusing, small output energy spread, small emittance growth, and high current limit. Based on the IH-EMQ beam dynamic scheme, the physical design optimization will be carried out, including beam dynamic design optimization and RF design optimization, in order to design a model cavity of IH-DTL, and the optimal design methods and steps suitable for this scheme will be summarized. On the basis of the physical design, the model cavity model will be established and the development of the model cavity will be carried out. The RF design of the design scheme can be verified by comparing the cold-test and field-tuning experiment results and simulation results of the model cavity.