# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2017, Vol. 28 ›› Issue (5): 68

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### A tracking system for the external target facility of CSR

Shu-Wen Tang1, Shi-Tao Wang1, Li-Min Duan1, Zhi-Yu Sun1*, Yu-Hong Yu1, Xue-Heng Zhang1, Ke Yue1, Chen-Gui Lu1, He-Run Yang1, Peng Ma1, Fang Fang1, Duo Yan1, Yu Sun1,2

1. 1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
• Supported by:

Supported by the National Natural Science Foundation of China (Nos. U1332207, 11222550, 11405242 and 11305222).

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Shu-Wen Tang, Shi-Tao Wang, Li-Min Duan, Zhi-Yu Sun, Yu-Hong Yu, Xue-Heng Zhang, Ke Yue, Chen-Gui Lu, He-Run Yang, Peng Ma, Fang Fang, Duo Yan, and Yu Sun. A tracking system for the external target facility of CSR.Nuclear Science and Techniques, 2017, 28(5): 68
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Abstract:

A tracking system composed of three multiwires proportional chambers (MWPCs) for the external target facility of the Cooler Storage Ring is reported in this paper. The active areas of the MWPCs are 518 mm  x 9400 mm, 582 mm x 9450 mm, and 710 mm x 9500 mm. Each MWPC consists of a series of alternately placed
cathode and anode wire planes and can measure position along the directions of -30°, 0°, and 30° relative to horizontal. The construction and operation of the detectors are described, and a method for track reconstruction is introduced. A track-finding efficiency of about 62% and a spatial resolution of 1.21 mm have been achieved. The pion and proton can be identified clearly with the tracking system combined with a time-of-flight system.