Spatial and spectral measurement of laser-driven protons through radioactivation  

作　　者：Yin‑Ren Shou Xue‑Zhi Wu Gwang‑Eun Ahn Seung Yeon Kim Seong Hoon Kim Hwang Woon Lee Jin Woo Yoon Jae Hee Sung Seong Ku Lee Xue‑Qing Yan Il Woo Choi Chang Hee Nam 

机构地区：[1]Center for Relativistic Laser Science,Institute for Basic Science,Gwangju 61005,Republic of Korea [2]School of Physics,Peking University,Beijing 100871,China [3]Advanced Photonics Research Institute,Gwangju Institute of Science and Technology,Gwangju 61005,Republic of Korea [4]Department of Physics and Photon Science,Gwangju Institute of Science and Technology,Gwangju 61005,Republic of Korea

出　　处：《Nuclear Science and Techniques》2023年第12期30-39,共10页核技术（英文）

基　　金：supported by the Institute for Basic Science;Korea under the project code IBS-R012-D1;by the Ultrashort Quantum Beam Facility(UQBF)operation program(No.140011)through APRI,GIST。

摘　　要：The simultaneous measurement of the spatial profile and spectrum of laser-accelerated protons is important for further optimization of the beam qualities and applications.We report a detailed study regarding the underlying physics and regular procedure of such a measurement through the radioactivation of a stack composed of aluminum,copper,and CR-39 plates as well as radiochromic films(RCFs).After being radioactivated,the copper plates are placed on imaging plates(IPs)to detect the positrons emitted by the reaction products through contact imaging.The spectrum and energy-dependent spatial profile of the protons are then obtained from the IPs and confirmed by the measured ones from the RCFs and CR-39 plates.We also discuss the detection range,influence of electrons,radiation safety,and spatial resolution of this measurement.Finally,insights regarding the extension of the current method to online measurements and dynamic proton imaging are also provided.

关 键 词：Laser-driven proton acceleration Proton-induced nuclear reaction Radioactivation measurement Contact imaging 

分 类 号：O571.422[理学—粒子物理与原子核物理]