Abstract

The Ion-12SC is a sub-compact, 12.5 MeV proton super-conducting isochronous cyclotron for commercial medical isotope production recently developed at Ionetix Corporation. The machine features a patented cold steel and cryogen-free conduction cooling magnet, a low power internal cold-cathode PIG ion source, and an internal liquid target. It is designed to produce N-13 ammonia for dose on-demand cardiology applications but can also be used to produce F-18, Ga-68 and other medical isotopes widely used in Positron Emission Tomography (PET). The cyclotron is being installed and commissioned at several medical centers. During the initial machine operating periods, some issues appeared. In particular, imperfections in manufacturing and assembly of the magnet introduced unwanted low order magnetic harmonics that resulted in beam losses. This report presents results of analysis of the measured magnetic field and beam dynamics in the cyclotron that were initiated to solve the problem. The calculations led to a process for implementing compensating magnetic shims to improve the beam transmission.

中文翻译：

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超导回旋加速器的场和束动力学模拟的实验验证

摘要

Ion-12SC是Ionetix公司最近开发的用于商业医学同位素生产的超小型12.5 MeV质子超导同步回旋加速器。该机器具有获得专利的冷钢和无制冷剂传导冷却磁铁，低功率内部冷阴极PIG离子源以及内部液体靶。它设计用于生产N-13氨，用于按需剂量心脏病学应用，但也可以用于生产F-18，Ga-68和其他正电子发射断层扫描（PET）中广泛使用的医学同位素。回旋加速器正在多个医疗中心进行安装和调试。在最初的机器运行期间，出现了一些问题。特别地，磁体的制造和组装中的缺陷引入了不想要的低阶磁谐波，这导致了束损耗。该报告介绍了为解决该问题而对回旋加速器中测得的磁场和电子束动力学进行分析的结果。该计算导致实现用于补偿磁垫片以改善束传输的过程。