Donghyup Ha, SeungHyun Lee, Mitra Ghergherehchi, Sangbeen Lee, Hyojeong Choi, Ho Namgoong, Jong-Seo Chai
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引用次数: 0
摘要
我们制作并调谐了一个由 23 个单元组成的 X 波段电子 LINAC,用于放射治疗。制造过程使用无氧高导电铜,分为粗加工和精加工两个阶段,以尽量减少加工误差。对半电池、两个半电池组合的单元电池以及组装后的所有电池进行了共振频率测量和调谐。最后,使用拉珠测试对整个射频腔内的电场进行了测量和调谐。之所以采用多步骤测量和调谐,是为了尽量减少调谐次数。大多数调谐都是沿着频率增加的方向进行的,只有少数调谐是沿着频率降低的方向进行的。所有单元的调谐方法相同。最终确定的腔体共振频率为 9.306 千兆赫,耦合系数为 1.277。通过深度剂量百分比(PDD)测试进行了性能验证,证实与 6 MV X 射线的结果非常吻合。
High precision tuning of RF cavity for 6 MeV SKKU X-band medical LINAC
An X-band electron LINAC comprising 23 cells was fabricated and tuned for radiation therapy. The fabrication process used oxygen-free high-conductivity copper, which was divided into roughing and finishing stages to minimize machining errors. Resonance frequency measurements and tuning were performed for the half-cell, the unit cell with two half-cells combined, and all cells after assembly. Finally, the electric field inside the entire RF cavity was measured and tuned using a bead-pull test. The reason for the multi-step measurement and tuning was to minimize the number of tunings. Most of the tuning was done in the direction of increasing the frequency, and only a few were done in the direction of decreasing the frequency. All cells were tuned the same way. The finalized cavity had a resonance frequency of 9.306 GHz and a coupling coefficient of 1.277. Performance validation was performed through the percentage depth dose (PDD) test, confirming good agreement with the results for 6 MV X-rays.
期刊介绍:
The Journal of the Korean Physical Society (JKPS) covers all fields of physics spanning from statistical physics and condensed matter physics to particle physics. The manuscript to be published in JKPS is required to hold the originality, significance, and recent completeness. The journal is composed of Full paper, Letters, and Brief sections. In addition, featured articles with outstanding results are selected by the Editorial board and introduced in the online version. For emphasis on aspect of international journal, several world-distinguished researchers join the Editorial board. High quality of papers may be express-published when it is recommended or requested.