A prototype beam monitor was designed to provide tracking information for heavy-ion projectiles for the cool storage ring(CSR)external target experiment(CEE)at the Heavy Ion Research Facility in Lanzhou(HIRFL).High granularity and direct charge sensing are the main features of this device.It measures the beam position in a two-dimensional(2D)plane transverse to the beam direction on an event-by-event basis.The current design consists of two field cages inside a single vessel that operates independently and has electrical drift fields in orthogonal directions.Preliminary tests of the prototype were performed using a 241 Am α source.The results show that a spatial resolution of less than 40 μm and a time resolution of less than 600 ns can be achieved.

PLAC,Key Laboratory of Quark and Lepton Physics(MOE),Central China Normal University,Wuhan 430079,China;Hubei Provincial Engineering Research Center of Silicon Pixel Chip&Detection Technology,Wuhan 430079,China;School of Physics and Electronic Science,Guizhou Normal University,Guiyang 550001,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China

[1]Hu-Lin Wang;Zhen Wang;Chao-Song Gao;Jian-Wei Liao;Xiang-Ming Sun;Hai-Bo Yang;Cheng-Xin Zhao;Jun Liu;Peng Ma;Zi-Li Li;Bi-Hui You;Ping Yang;Di Guo;Le Xiao;Dong-Liang Zhang;Yue-Zhao Zhang;Sheng Dong;Wan-Han Feng;Yu-Xin Qiao;Zheng-Yu Hu;Qing-Wen Ye;Zeng-Tao Guo;Guang-Ming Huang;Feng Liu-.Design and tests of the prototype a beam monitor of the CSR external target experiment)[J].核技术（英文版）,2022(03):137-151

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