分类： 核科学技术 >> 粒子加速器 提交时间： 2023-06-18 合作期刊: 《Nuclear Science and Techniques》
ZHANG Xiao-Ding
LI Yi-Ding
YANG Guo-Jun
WEI Tao
HE Xiao-Zhong
LONG Ji-Dong
JIANG Xiao-Guo
MA Chao-Fan
ZHAO Liang-Chao
YANG Xing-Lin
ZHANG Zhuo
WANG Yuan
LI Wei-Feng
SHI Jin-Shui
摘要： Proton radiography experiment with a Zumbro lens system was carried out on an 11 MeV proton cyclotron. The experimental results show that the image blurring is improved markedly. Clear images and good spatial resolution of the density step edges are obtained, which is important for hydrotest experiments, and the spatial resolution can achieve 100 m.
分类： 核科学技术 >> 粒子加速器 提交时间： 2023-06-18 合作期刊: 《Nuclear Science and Techniques》
LI Yi-Ding
ZHANG Xiao-Ding
WEI Tao
ZHAO Liang-Chao
HE Xiao-Zhong
MA Chao-Fan
YANG Guo-Jun
JIANG Xiao-Guo
摘要： Differing from radiography without lens system, the high-energy proton radiography (PRAD) uses Zumbro lens system to focus the penetrating protons. Since the Zumbro lens system is able to limit the range of multiple Coulomb scattering angles of the protons, the low-energy PRAD with Zumbro lens system is also feasible, although the attenuation of probing protons in the object is negligible. Low-energy PRAD is superior to the high-energy PRAD for diagnosing the objects of small thicknesses. To verify the imaging principle of Zumbro lens system, 11 MeV PRAD experiments were performed at the China Academy of Engineering Physics (CAEP) recently. The experiment results demonstrated that this 11 MeV PRAD was able to radiograph objects of area density less than 2.7�10-2 g/cm2 and the area density discrepancy less than 2.3% could be distinguished.
分类： 核科学技术 >> 粒子加速器 提交时间： 2023-06-18 合作期刊: 《Nuclear Science and Techniques》
摘要： Recently we measured with the Modified Three Gradient Method (MTGM) [1, 2] the beam emittance of an injector constructed in 2012, which was designed to provide a 2.4 kA, 2.6 MeV electron beam. The MTGM is a non-intercept indirect method, which is based on the three gradient type measurements of beam profiles and subsequent data processing which helps to get the least square solution to the beam emittance. Beam profiles under different currents of guiding coil are measured using Cerenkov radiation given off by a piece of quartz glass in the beam tube, which is recorded with a CCD camera. MTGM Code is developed to realize the data fitting as well as beam transport simulation, in which both the matrix method and the numerical solution of root-mean-square beam envelope equation are used. The error is also analyzed.
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