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一种内置永磁四极透镜的IH-DTL的束流动力学设计

Beam Dynamic Design of IH-DTL with Built-in Permanent Magnet Quadrupole Lens

  • 摘要: 基于KONUS 束流动力学方案,完成了一台内置永磁四极透镜的紧凑型IH-DTL的束流动力学设计。该DTL内置两组永磁四极透镜,共37个加速单元,可将流强为20 emA的C6+离子束从0.5加速至4.0 MeV/u。在设计过程中,为了控制强流离子束在低能段的横纵向发射度增长,对加速间隙的电压、四极磁铁参数和束流注入相位设置、0度参考粒子的能量及相位设置进行着重优化。最终该 IH-DTL 的横向归一化RMS接受度达到 0.37 πmm · mrad,束流传输效率在95%以上。

     

    Abstract: Based on KONUS dynamics, the beam dynamic design of a compact IH-DTL with built-in permanent magnet quadrupole lens was completed. The DTL consists 37 acceleration cells and two sets of permanent magnet quadrupole lenses, enabling the acceleration of C6+ ion beam of 20 emA from 0.5 MeV/u to 4.0 MeV/u. Throughout the design process, significant focus was placed on optimizing the voltage of the acceleration gap, the parameters of the quadrupole magnet, the phase setting of the beam injection, and the energy and phase setting of the 0-degree reference particle to control the transverse and longitudinal emittance growth of the high-current ion beam in the low-energy range. Consequently, transverse normalized RMS acceptance of the IH-DTL reaches 0.37 πmm · mrad, and the transmission efficiency exceeds 95%.

     

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