# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (9): 134

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS •

### Beam optics study for energy selection system of SC200 superconducting proton cyclotron

Xian-Hu Zeng 1,2, Jin-Xing Zheng 1,2, Yun-Tao Song 1,2, Feng Jiang 1,2, Ming Li 1,2, Jun-Sheng Zhang 1,2, Wu-Quan Zhang 1, Lei Zhu1

1. 1 Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
2 University of Science and Technology of China, Hefei 230031, China
• Contact: Jin-Xing Zheng E-mail:jxzheng@ipp.ac.cn
• Supported by:

This work was supported in part by the National Natural Science Foundation of China (No. 51507173) and Anhui Province Natural Science Foundation of China (No. 1608085QE93).

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Xian-Hu Zeng, Jin-Xing Zheng, Yun-Tao Song, Feng Jiang, Ming Li, Jun-Sheng Zhang, Wu-Quan Zhang, Lei Zhu. Beam optics study for energy selection system of SC200 superconducting proton cyclotron.Nuclear Science and Techniques, 2018, 29(9): 134
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Abstract:

To meet the demands on proton therapy in Russia and China, JINR and ASIPP have started to develop a proton therapy facility based on an isochronous superconducting proton accelerator. A 200 MeV/500 nA proton beam will be extracted from the SC200 superconducting proton cyclotron. Due to the energy of the cyclotron being fixed, an energy selection system (ESS) is employed to degrade such energy in order to match the particle energy to a shallower depth. In this article, calculation of beam optics, analysis of beam transmission, and correction of orbit distortion are presented. Studies show that the main factors influencing transmission efficiency of the SC200 ESS beamline are the degrader, collimator, slit, vacuum system, beam diagnostic system, and trajectory correction system. Through the beam optics study, the designed ESS beamline can provide 70–200 MeV proton beam to a treatment room, with a maximum emittance of 24 π mm mrad. Also, the controllable momentum spread ranges from 0.1 to 1.0%, which is equivalent to an energy spread from 0.193 to 1.93%. The transmission efficiency about 0.204% can be obtained when the emittance is 24 π mm mrad with an energy spread of ± 0.6%.