Study on the radiation problem caused by electron beam loss in accelerator tubes

LI Quan-Feng; GUO Bing-Qi; ZHANG Jie-Xi; CHEN Huai-Bi

doi:10.1088/1674-1137/32/7/014

Chinese Physics C> 2008, Vol. 32> Issue(7) : 580-583 DOI: 10.1088/1674-1137/32/7/014

Study on the radiation problem caused by electron beam loss in accelerator tubes

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Abstract：
The beam dynamic code PARMELA was used to simulate the transportation process of accelerating electrons in S-band SW linacs with different energies of 2.5, 6 and 20MeV. The results indicated that in the ideal condition, the percentage of electron beam loss was 50% in accelerator tubes. Also we calculated the spectrum, the location and angular distribution of the lost electrons. Calculation performed by Monte Carlo code MCNP demonstrated that the radiation distribution of lost electrons was nearly uniform along the tube axis, the angular distributions of the radiation dose rates of the three tubes were similar, and the highest leaking dose was at the angle of 160° with respect to the axis. The lower the energy of the accelerator, the higher the radiation relative leakage. For the 2.5MeV accelerator, the maximum dose rate reached 5% of the main dose and the one on the head of the electron gun was 1%, both of which did not meet the eligible protection requirement for accelerators. We adopted different shielding esigns for different accelerators. The simulated result showed that the shielded radiation leaking dose rates fulfilled the requirement.

References

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. Daves J L, Mills M D. Journal of Applied Clinical Medical Physics, 2001, 2(3): 165-1742. Shin C H, Kim J K, Bo Kyun SEO et al. Journal of Nuclear Science and Technology, 2000, Supplement1: 231-2343. CUI Yong-Gang, LI Yu-Xiong, SHAO Bei-Bei et al. Radi-ation Protection, 2001, 21(4): 238-241 (in Chinese)4. LIU Nai-Quan. Accelerator Theory. 2ed Edition. Beijing:Tsinghua University Press, 2004 (in Chinese)5. Young L M. Parmela. 19986. X-5 Monte Carlo Team. Mcnp: A General Monte CarloN-Particle Transport Code. 20037. GBZ 126-2002. Radiological Protection Standard for Using of Medical Electron Accelerator. Beijing: China National Bureau of Technical Supervisio, 2002 (in Chinese)

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LI Quan-Feng, GUO Bing-Qi, ZHANG Jie-Xi and CHEN Huai-Bi. Study on the radiation problem caused by electron beam loss in accelerator tubes[J]. Chinese Physics C, 2008, 32(7): 580-583. doi: 10.1088/1674-1137/32/7/014

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Received: 2007-08-30
Revised: 2007-10-09

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沈阳化工大学材料科学与工程学院沈阳 110142

Study on the radiation problem caused by electron beam loss in accelerator tubes

Corresponding author: LI Quan-Feng,

Received Date: 2007-08-30
Accepted Date: 2007-10-09
Available Online: 2008-07-05

Abstract: The beam dynamic code PARMELA was used to simulate the transportation process of accelerating electrons in S-band SW linacs with different energies of 2.5, 6 and 20MeV. The results indicated that in the ideal condition, the percentage of electron beam loss was 50% in accelerator tubes. Also we calculated the spectrum, the location and angular distribution of the lost electrons. Calculation performed by Monte Carlo code MCNP demonstrated that the radiation distribution of lost electrons was nearly uniform along the tube axis, the angular distributions of the radiation dose rates of the three tubes were similar, and the highest leaking dose was at the angle of 160° with respect to the axis. The lower the energy of the accelerator, the higher the radiation relative leakage. For the 2.5MeV accelerator, the maximum dose rate reached 5% of the main dose and the one on the head of the electron gun was 1%, both of which did not meet the eligible protection requirement for accelerators. We adopted different shielding esigns for different accelerators. The simulated result showed that the shielded radiation leaking dose rates fulfilled the requirement.