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

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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 (μSR) 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 μSR spectrometers in the world.

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Authors and Affiliations

  1. State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, 230026, China

    Zi-Wen Pan, Jing-Yu Dong, Xiao-Jie Ni & Bang-Jiao Ye

  2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China

    Lu-Ping Zhou & Jing-Yu Tang

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Lu-Ping Zhou

  4. ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire, OX11 0QX, UK

    Daniel E. Pooley & Stephen P. Cottrell

Authors
  1. Zi-Wen Pan
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  2. Jing-Yu Dong
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  3. Xiao-Jie Ni
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  4. Lu-Ping Zhou
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  5. Jing-Yu Tang
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  6. Daniel E. Pooley
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  7. Stephen P. Cottrell
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  8. Bang-Jiao Ye
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Corresponding author

Correspondence to Bang-Jiao Ye.

Additional information

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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Pan, ZW., Dong, JY., Ni, XJ. et al. Conceptual design and update of the 128-channel μSR prototype spectrometer based on musrSim. NUCL SCI TECH 30, 123 (2019). https://doi.org/10.1007/s41365-019-0648-5

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  • DOI: https://doi.org/10.1007/s41365-019-0648-5

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