First experimental research in low energy proton radiography

Tao, Wei; Gao, Yang; Li, Yiding; Long, Jidong; He, Xiao‐Gang; Xiaoding, Zhang; Jiang, Xiaoguo; Ma, Chun-Wang; Zhao, Lei; Yang, Xing-Lin; Zhou, Zhuo; Yuan, Wei; Pang, Jian; Li, Hong; Li, Weifeng; Zhou, Fu-Xin; Shi, Jinshui; Zhang, Kaizhi; Li, Jin; Zhang, Linwen; Deng, Jianjun

doi:10.1088/1674-1137/38/8/087003

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…德国科学家利用4.5 GeV的质子加速器进行了质子照相研究 [12] . 中国原子能研究院设计了100 MeV 的质子成像系统 [13] , 兰州近代物理研究所设计了 600 MeV/u的碳离子照相系统和800 MeV的电子照相装置 [14,15] , 中国工程物理研究院对质子成像系统以及成像模糊等问题展开了研究 [16,17] , 清华大学展开了电子照相在高能量密度物理中的应用研究 [18] . 质子成像系统由两组四极磁透镜对和准直器组成, 如图1所示.…”

Section: 引言unclassified

Optimization of proton imaging system including fringe field of magnetic lens

中国工程物理研究院研究生院¹,

华北电力大学电气与电子工程学院现代电子技术研究所²,

北京应用物理与计算数学研究所³

2021

Acta Phys. Sin.

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The proton imaging system is composed of four quadrupole magnetic lenses and a collimator. The quadrupole magnetic lenses can realize point-to-point imaging, and the collimator can improve image quality by controlling proton flux and realize material diagnosis. The magnetic field gradient of an ideal quadrupole lens becomes zero at the edge. Inside the lens, the magnetic field gradient is constant along the axis, while the magnetic field boundary of the actual lens extends outward. In the proton imaging system, the fringing field will affect the proton transport state and the performance of the imaging system as well. In this paper, a method to optimize the system is presented when the fringe field is considered. A proton imaging system of 1.6 GeV is established with the Geant 4 program, in which the magnetic field gradient distribution of the actual lens is approximated by the Bell function. In an ideal imaging system, the external drift length is 1.2 m, the internal drift length is 0.5 m, the length of the magnet is 0.8 m, and the magnetic field gradient is 8.09 T/m. The parameters of the practical imaging system can be obtained by using the optimization method: when the integral difference in magnetic field gradient distribution between the actual lens and the ideal lens is equal to zero, the outer drift length of the imaging system is 1.203 m and the inner drift length is 0.506 m; when the integral difference in the magnetic field gradient distribution between the actual lens and the ideal lens is equal to 1%, the outer drift length is 1.208 m and the inner drift length is 0.516 m. In the numerical simulation, a 1mm-thick copper plate and a concentric ball are chosen as the objects, and the influence of the fringing field on the collimator aperture and that on the proton flux error are studied. The results show that the optimized imaging system can reduce the flux error of protons passing through the object, and the difference in the aperture of collimator is on the order of 10<sup>–2</sup> when the integral difference is on the order of 10<sup>–2</sup> in magnitude.

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Section: 引言unclassified

Optimization of proton imaging system including fringe field of magnetic lens

中国工程物理研究院研究生院¹,

华北电力大学电气与电子工程学院现代电子技术研究所²,

北京应用物理与计算数学研究所³

2021

Acta Phys. Sin.

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“…ZnO could be utilized as an efficient mechanical support and electrical conduction path for other materials. For instance, ZnO with various mophologies has been introduced in hybrid electrodes to support transition oxides or hydroxides, and sulfides, such as ZnO/MnO 2 [15], ZnO/NiO [16], ZnO/Ni(OH) 2 [17,18], and ZnO/ZnS [19]. Many other works have focused on combination of ZnO and carbon materials to improve the stability of supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Morphology engineering of ZnO nanostructures for high performance supercapacitors: enhanced electrochemistry of ZnO nanocones compared to ZnO nanowires

Yoo

Lee

et al. 2017

Nanotechnology

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In this work, the morphology of ZnO nanostructures is engineered to demonstrate enhanced supercapacitor characteristics of ZnO nanocones (NCs) compared to ZnO nanowires (NWs). ZnO NCs are obtained by chemically etching ZnO NWs. Electrochemical characteristics of ZnO NCs and NWs are extensively investigated to demonstrate morphology dependent capacitive performance of one dimensional ZnO nanostructures. Cyclic voltammetry measurements on these two kinds of electrodes in a three-electrode cell confirms that ZnO NCs exhibit a high specific capacitance of 378.5 F g at a scan rate of 20 mV s, which is almost twice that of ZnO NWs (191.5 F g). The charge-discharge and electrochemical impedance spectroscopy measurements also clearly result in enhanced capacitive performance of NCs as evidenced by higher specific capacitances and lower internal resistance. Asymmetric supercapacitors are fabricated using activated carbon (AC) as the negative electrode and ZnO NWs and NCs as positive electrodes. The ZnO NC⫽AC can deliver a maximum specific capacitance of 126 F g at a current density of 1.33 A g with an energy density of 25.2 W h kg at the power density of 896.44 W kg. In contrast, ZnO NW⫽AC displays 63% of the capacitance obtained from the ZnO NC⫽AC supercapacitor. The enhanced performance of NCs is attributed to the higher surface area of ZnO nanostructures after the morphology is altered from NWs to NCs.

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“…Usual resolution even with the low energy proton beams is several tens of µm. This resolution of the proton radiography method could be apparently further improved and its limits are far beyond present ranges [3]. Very good resolution of the proton radiography [4] could lead to a specific high resolution 3D imaging, where a complete 3D image of the sample could be obtained by two or three laser shots in the proposed ion source.…”

Section: Introductionmentioning

confidence: 99%

Ion Source for a Single Particle Accelerator

Matlocha

2016

APP

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This paper proposes a method to obtain very low beam current on the injection side of an particle accelerator. By using a combination of a well known ion source type and a short photo-emissive laser pulse, very low amount of ions can be created. The method could be used in the ion source of various types of the accelerators, where very low beam current is essential. The design is adapted to build a compact internal ion source and the dimensions of the device are adjusted to fit central region of the cyclotron U-120M. The functional parameters of the device are discussed and the ammount of the produced ions is estimated.

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First experimental research in low energy proton radiography

Cited by 9 publications

References 8 publications

Optimization of proton imaging system including fringe field of magnetic lens

Optimization of proton imaging system including fringe field of magnetic lens

Morphology engineering of ZnO nanostructures for high performance supercapacitors: enhanced electrochemistry of ZnO nanocones compared to ZnO nanowires

Ion Source for a Single Particle Accelerator

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