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 ›› 2019, Vol. 30 ›› Issue (8): 123 doi: 10.1007/s41365-019-0648-5

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

Conceptual design and updating of the 128-channel μSR prototype spectrometer based on musrSim

Zi-Wen Pan 1 • Jing-Yu Dong 1 • Xiao-Jie Ni 1 • Lu-Ping Zhou 2,3 • Jing-Yu Tang 2 • Daniel E. Pooley 4 • Stephen P. Cottrell 4 • Bang-Jiao Ye 1   

  1. 1 State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
    2 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
    3 University of Chinese Academy of Sciences, Beijing 100049, China
    4 ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, UK
  • Received:2018-12-10 Revised:2019-04-14 Accepted:2019-04-17
  • Contact: Bang-Jiao Ye E-mail:bjye@ustc.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No. 11527811) and the Key Program of State Key Laboratory of Particle Detection and Electronics. A part of the work performed in the UKRI ISIS Detector Group was sponsored by the China Scholarship Council.
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Zi-Wen Pan, Jing-Yu Dong, Xiao-Jie Ni, Lu-Ping Zhou, Jing-Yu Tang, Bang-Jiao Ye. Conceptual design and updating of the 128-channel μSR prototype spectrometer based on musrSim.Nuclear Science and Techniques, 2019, 30(8): 123     doi: 10.1007/s41365-019-0648-5
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Abstract: An experimental muon source (EMuS) will be built at the China Spallation Neutron Source (CSNS). In phase I of CSNS, it has been decided that EMuS will provide a proton beam of 5 kW and 1.6 GeV to generate muon beams. A 128-channel muon spin rotation/relaxation/ resonance (lSR) spectrometer is proposed as a prototype surface muon spectrometer in a sub-branch of EMuS. The prototype spectrometer includes a detection system, sample environment, and supporting mechanics. The current design has two rings located at the forward and backward directions of the muon spin with 64 detectors per ring. The simulation shows that the highest asymmetry of approximately 0.28 is achieved by utilizing two 10-mm-thick brass degraders. To obtain the optimal asymmetry, the two-ring structure is updated to a four-ring structure with 32 segments in each ring. An asymmetry of 0.42 is obtained through the simulation, which is higher than that of all the current lSR spectrometers in the world.

Key words: EMuS, lSR spectrometer, 128-Channel, Two-ring structure, Four-ring structure, Asymmetry