Optical system of the proton bombarding setup on the U-70 accelerator at the institute for high energy physics

Maksimov, A. V.; Tyurin, N. E.; Fedotov, Yu.S.

doi:10.1134/s1063784214090163

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…Indeed, the transfer matrix MZ is formed by a pair of the same symmetric submatrix [14] that MZ � MZ sub * MZ sub . Each submatrix describes the transmission of proton in one half of Zumbro lens.…”

Section: Optimization Constraintsmentioning

confidence: 99%

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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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Section: Optimization Constraintsmentioning

confidence: 99%

“…in-lens approximation is applied [14] for lens optimization. Some software such as WinAGILE [15] and COSY INFINITY [16,17] can be used to search the lens parameter.…”

Section: Introductionmentioning

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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“…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. 四极磁透镜使系统实现点对点成像, 角度准直器可以控制通量, 从而实现调节对比度、密度重建和材料诊断 [19] . 理想磁透镜的磁场梯度在边缘处突变为零, 在透镜内部, 磁场梯度沿轴向为常数, 而实际透镜的磁场边界向外延伸, 如图2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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“…Proton radiography with magnetic lenses was invented in the 1990's at Los Alamos National Laboratory (LANL) as a diagnostic to study dynamic material properties under extreme pressures, densities and strain rates 2 . Since that time proton radiography and microscopy facilities have been also commissioned at the Institute for Theoretical and Experimental Physics (ITEP) 3,4 and at the Institute for High Energy Physics (IHEP) [5][6][7] in Russia.…”

Section: Introductionmentioning

confidence: 99%

Commissioning of the PRIOR proton microscope

Varentsov

Antonov

Bakhmutova

et al. 2016

Review of Scientific Instruments

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Recently, a new high energy proton microscopy facility PRIOR (Proton Microscope for FAIR Facility for Anti-proton and Ion Research) has been designed, constructed, and successfully commissioned at GSI Helmholtzzentrum für Schwerionenforschung (Darmstadt, Germany). As a result of the experiments with 3.5-4.5 GeV proton beams delivered by the heavy ion synchrotron SIS-18 of GSI, 30 μm spatial and 10 ns temporal resolutions of the proton microscope have been demonstrated. A new pulsed power setup for studying properties of matter under extremes has been developed for the dynamic commissioning of the PRIOR facility. This paper describes the PRIOR setup as well as the results of the first static and dynamic proton radiography experiments performed at GSI.

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Optical system of the proton bombarding setup on the U-70 accelerator at the institute for high energy physics

Cited by 10 publications

References 2 publications

Design of a Lens System Reduces Chromatic Aberration for Proton Radiography

Design of a Lens System Reduces Chromatic Aberration for Proton Radiography

Optimization of proton imaging system including fringe field of magnetic lens

Commissioning of the PRIOR proton microscope

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