Calculation of the Beam Loss in the 270° Bending Magnet System of the Medical Accelerator

LI Quan-Feng; KONG Chao-Cheng; GUO Bing-Qi; XING Qing-Zi

Chinese Physics C> 2007, Vol. 31> Issue(8) : 787-791

Calculation of the Beam Loss in the 270° Bending Magnet System of the Medical Accelerator

Department of Engineering Physics, Tsinghua University, Beijing 100084, China

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Abstract：
The transportation process of the electron beam in the 270° bending magnet system of the medical accelerator is studied under the one-order approximation, and the influence of the initial condition to the beam transportation and loss is analyzed for the calculation of the radiation dose. The theory of the beam transportation, combined with the Monte Carlo sampling method is applied. The simulation result shows that the energy spread is the main factor resulted in the beam loss. The data on the position, energy and direction of the lost electrons obtained through the simulation can be supplied as input to deal with the radiation problem. The result gives that the loss rate of the electron beam is 13.5%, and the direction of the main loss is toward the upside of the irradiating head of the accelerator with the radius 1mm, angle spread 5mrad, and energy spread 10% of the initial beam.

References

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. WU Pin, LI Quan-Feng. J. Tsinghua Univ. (Sci. Tech.),2000, 40(10): 24-27(in Chinese)(吴频，李泉风.清华大学学报，2000, 40(10): 24-27)2. FANG Chun-Jiang. Application of Monte-Carlo Method inMedical Accelerator and Industrial CT. Master Disserta-tion of Tsinghua Univ., 2003(in Chinese)(方春江.蒙特卡罗方法在医用加速器及上业CT中的应用[硕士学位论文].北京:清华大学工程物理系，2003)3. GU Ben-Guang. Medical Accelerators. Beijing: SciencePress, 2003(in Chinese)(顾本广.医用加速器.北京:科学出版社，2003)4. GB 16369-1996 Radiological Health Standard for the Med-ical Electron Accelerators, 1996(in Chinese)(G B 16369-1996医用电子加速器放射卫生防护标准，1996)5. XU Shu-Yan. Application of Monte-Carlo Method in Ex-perimental Nuclear Physics. Beijing: Atomic Energy Press,1996.(in Chinese)(许淑艳.蒙特卡罗方法在实验核物理中的应用.北京:原子能出版社，1996)6. PEI Lu-Cheng, WANG Zhong-Qi. Monte-Carlo Methodand Its Applications. Beijing: Ocean Press, 1998(in Chinese)(裴鹿成，王仲奇.蒙特卡罗方法及其应用.北京:海洋出版社,1998)7. KONG Chao-Cheng. Radiation Physics Problem Calcula-tion and Research of Electron Linear Accelerator. MasterDissertation of Tsinghua Univ., 2006(in Chinese)(孔巢城.电子直线加速器中相关辐射物理问题的研究计算[硕士学位论文].北京:清华大学工程物理系，2006)8. XIA Hui-Qin, LIU Chun-Liang. Principles of the BeamTransportation. Xi'an Jiaotong Univ. Press, 1991. 101-125(in Chinese)(夏慧琴，刘纯亮.束流传输原理.西安交通大学出版社,1991.101-125)

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LI Quan-Feng, KONG Chao-Cheng, GUO Bing-Qi and XING Qing-Zi. Calculation of the Beam Loss in the 270° Bending Magnet System of the Medical Accelerator[J]. Chinese Physics C, 2007, 31(8): 787-791.

LI Quan-Feng, KONG Chao-Cheng, GUO Bing-Qi and XING Qing-Zi. Calculation of the Beam Loss in the 270° Bending Magnet System of the Medical Accelerator[J]. Chinese Physics C, 2007, 31(8): 787-791. shu

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Received: 2006-11-01
Revised: 2006-12-02

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沈阳化工大学材料科学与工程学院沈阳 110142

Calculation of the Beam Loss in the 270° Bending Magnet System of the Medical Accelerator

Corresponding author: LI Quan-Feng,

Department of Engineering Physics, Tsinghua University, Beijing 100084, China

Received Date: 2006-11-01
Accepted Date: 2006-12-02
Available Online: 2007-08-05

Abstract: The transportation process of the electron beam in the 270° bending magnet system of the medical accelerator is studied under the one-order approximation, and the influence of the initial condition to the beam transportation and loss is analyzed for the calculation of the radiation dose. The theory of the beam transportation, combined with the Monte Carlo sampling method is applied. The simulation result shows that the energy spread is the main factor resulted in the beam loss. The data on the position, energy and direction of the lost electrons obtained through the simulation can be supplied as input to deal with the radiation problem. The result gives that the loss rate of the electron beam is 13.5%, and the direction of the main loss is toward the upside of the irradiating head of the accelerator with the radius 1mm, angle spread 5mrad, and energy spread 10% of the initial beam.