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硼中子俘获治疗加速器ECR质子源电磁场仿真设计

Electromagnetic Simulation Design of ECR Proton Source for BNCT Accelerator

    摘要
  • 摘要: 电子回旋共振(ECR)质子源具有可给流强高、亮度高、可靠性高、使用频率高、易维护、小型化等优点，因而被硼中子俘获治疗(BNCT)装置的直线加速器所采用。本文利用CST软件对2.45 GHz ECR质子源进行优化设计。优化后ECR质子源的等离子体发生器腔体的尺寸为101.12 mm×45.00 mm，给出了脊波导耦合器的最优尺寸参数，使等离子体发生器腔体内电场强度提高为普通波导的4.5倍。通过Opera-3D对ECR质子源的引出电极结构进行了仿真计算，并给出了优化参数。另外，初步设计了质子源的线圈磁铁系统，优化了磁场分布。本文结果为质子源的研制提供了数据。

     

    Abstract: Based on the advantages of high beam current, high brightness, high reliability, high utilization rate, easy maintenance, and compactness, electron cyclotron resonance (ECR) proton source is used on the accelerator for boron neutron capture therapy (BNCT). With code CST, the 2.45 GHz ECR proton source was designed and optimized. The optimized size of plasma generator chamber is 101.12 mm×45.00 mm, and size of the ridge waveguide coupler was optimized. Compared with normal waveguide coupler, the electric field in the plasma generator chamber with ridge waveguide coupler is enhanced to 4.5 times. Parameters of extraction electrode structure were optimized by code Opera-3D, and size and voltage were given. In addition, the magnetic system was preliminarily designed and magnetic distribution was optimized. The results are important reference for proton source development.

     

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