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Description
Medical isotope production requires high-intensity ion beams, demanding reliable acceleration structures with high efficiency across a broad energy range. The Crossbar H-mode drift-tube linac (CH-DTL) is a promising option for 1.6–35 MeV/u acceleration due to its compact geometry, high gradient capability, and good mechanical stability.
This work presents the design study of a 425 MHz high-current CH-DTL dedicated to medical isotope applications. Starting from a single-cell physics design referenced to an IH-DTL, we establish a CH-DTL cavity tuned to the TE210 mode and perform comprehensive multi-physics analyses, including RF fields, thermal behavior, structural deformation, and cooling performance. The IH-DTL and CH-DTL cells are compared to highlight the structural advantages of the CH-DTL. Based on the optimized cell, beam-dynamics simulations are carried out to develop the full linac. A complete 3D CST model is constructed, and iterative electromagnetic–thermal–structural optimization confirms the engineering feasibility of the proposed high-current CH-DTL.
This study provides an effective design methodology and technical basis for high-current linacs used in medical isotope production.
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