Simulation of proton radiography terminal at the Institute of Modern Physics

Yan, Yan; Sheng, Lianxi; Huang, Z.; Wang, Jie; Yao, Zeen; Wang, Junrun; Zheng, Wei; Jiang, Yang; Yuan, Youjin

doi:10.1017/s0263034615000440

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…en, the expected θ 0 is about 0.44 mrad. In a pure material, the angular deviation θ 0 induced by MCS can be calculated by using the following formula [22]:…”

Section: Diffuser and Matching Lensmentioning

confidence: 99%

Design of a Lens System Reduces Chromatic Aberration for Proton Radiography

Jia

Wang

et al. 2022

Laser Part. Beams

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Multi-GeV proton radiography is an important tool for diagnosing density distribution of thick objects. The magnetic lens system called Zumbro lens is widely employed because it compensates for the image distortion induced by small angle multiple Coulomb scattering (MCS) that occurs when the charged protons passing through the object. However, radiography is still suffering from chromatic aberration induced blurring, if the momentum of transmitted proton is different from the reference value of Zumbro lens. In this paper, two methods are employed to reduce chromatic aberration. The first is based on magnetic lens optimization. In addition, a new lens system is first proposed locating the downstream of Zumbro. It is named “auxiliary” lens, which can correct the chromatic aberration for certain protons with momentum far away from the reference of Zumbro lens. Monte Carlo simulation shows that this proposed lens can decrease chromatic aberration and improve the radiography image evidently.

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“…en, the expected θ 0 is about 0.44 mrad. In a pure material, the angular deviation θ 0 induced by MCS can be calculated by using the following formula [22]:…”

Section: Diffuser and Matching Lensmentioning

confidence: 99%

Design of a Lens System Reduces Chromatic Aberration for Proton Radiography

Jia

Wang

et al. 2022

Laser Part. Beams

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Theoretical study of magnetic lens with parallel beam matched

et al. 2016

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Theoretical study of angle-cut collimator based design in high-energy proton radiography

Feng¹,

Xu²,

Jia³

et al. 2020

Acta Phys. Sin.

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The angle-cut collimator plays an important role in high-energy proton radiography. By using the collimator, the image contrast can be improved, and the material diagnosis and density reconstruction can be realized through secondary imaging. As all these techniques depend on the flux value, it is of great significance to reduce the error of the detected flux value. The ideal collimator is a much thin surface, but thick enough to block protons outside the collimation region. It is designed by stretching the aperture of the collimation plane. The shape is cylindrical, and it will increase the error of the flux value with the angle truncation. The initial bunch is defined and the phase diagram of the bunch within the angle-cut is ideal in the theoretical model. The equation of designing the collimator is given by theoretical analysis. It is given by the transfer matrix, the radius of the object and the angle-cut. The pore structure is oval-shaped by calculating and simulating. The proton imaging system of 1.6 GeV is established by Geant4 program, and the detector is ideal. The round copper plate and the concentric spheres are chosen as objects respectively. The parameters of the designed collimator is given by this method. The ideal collimator, tensile collimator and designed collimator are used in simulation, the radius of object is 5 cm and the angle-cut is 2 mrad and 3.5 mrad. The results show that when using the ideal and the designed angle-cut collimator, the flux distributions are in good agreement, while when using the tensile collimator, the result is quite different from that obtained by using the ideal collimator. Therefore, the collimator designed by this method can effectively reduce the error of the detected flux value.

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Simulation of proton radiography terminal at the Institute of Modern Physics

Cited by 3 publications

References 18 publications

Design of a Lens System Reduces Chromatic Aberration for Proton Radiography

Design of a Lens System Reduces Chromatic Aberration for Proton Radiography

Theoretical study of magnetic lens with parallel beam matched

Theoretical study of angle-cut collimator based design in high-energy proton radiography

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