High Power Laser and Particle Beams, Volume. 36, Issue 12, 124003(2024)

Simulation and source design of large area uniform bremsstrahlung field

Baiwen Ding1... Jianhong Hao1, Fang Zhang2,*, Qiang Zhao2, Jieqing Fan1 and Zhiwei Dong2 |Show fewer author(s)
Author Affiliations
  • 1School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China
  • 2Institute of Applied Physics and Computational Mathematics, Beijing 100094, China
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    Bremsstrahlung diode is an important device for obtaining large area uniform bremsstrahlung field in laboratory. In this paper, based on Monte Carlo method, a model of single and double ring parallel electron beam bombarding tantalum target is established to simulate the process of bremsstrahlung field generated by ring diode. The electron beam energy is 1.5 MeV, the tantalum target thickness is 200 μm, and the dose of bremsstrahlung field generated by a single ring electron beam 10 cm behind the target is simulated by detector counting method. For single-ring diode structure, the inner diameter of the ring is the main factor affecting the bremsstrahlung field uniformity behind the target, and the larger the inner diameter, the worse the central dose uniformity. Compared with the inner diameter of the ring, the ring width mainly affects the dose of the radiation field, but has little influence on the uniformity. When the inner diameter of a single ring is 19 cm and the outer diameter is 20 cm, a uniform radiation field with a maximum area of 2290.221 cm2 can be obtained. When the inner diameter of a single ring is 19 cm and the outer diameter is 20 cm, a uniform radiation field with a maximum area of 2290.221 cm2 can be obtained. The double-loop diode structure can obtain a larger area of uniform radiation field than the single-loop structure. However, the variation of the outer ring diameter leads to multi-level peaks in the dose distribution of the radiation field, which also affects the homogeneity of each region of the radiation field. The simulation results show that by adding a concentric outer ring with an inner diameter of 43.5 cm and an outer diameter of 44.167 cm to the outside of the single ring structure, the radiation field area meeting the uniformity requirement can be increased to 7238.229 cm2.

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    Baiwen Ding, Jianhong Hao, Fang Zhang, Qiang Zhao, Jieqing Fan, Zhiwei Dong. Simulation and source design of large area uniform bremsstrahlung field[J]. High Power Laser and Particle Beams, 2024, 36(12): 124003

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    Paper Information

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    Received: May. 21, 2024

    Accepted: Sep. 18, 2024

    Published Online: Jan. 15, 2025

    The Author Email: Zhang Fang (fangzhang328@163.com)

    DOI:10.11884/HPLPB202436.240175

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