Spin polarization and production rate studies of surface muons in a novel solenoid capture system based on CSNS

doi:10.1007/s41365-017-0261-4

Nuclear Science and Techniques ›› 2017, Vol. 28 ›› Issue (8): 109 doi: 10.1007/s41365-017-0261-4

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles Next Articles

Spin polarization and production rate studies of surface muons in a novel solenoid capture system based on CSNS

Ran Xiao^1,2, Yan-Fen Liu^1,2,3, Xiao-Jie Ni^1,2, Zi-Wen Pan^1,2, Bang-Jiao Ye^1,2

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

² Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

³ Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Supported by:
Supported by the National Natural Science Foundation of China (No. 11527811).

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Ran Xiao, Yan-Fen Liu, Xiao-Jie Ni, Zi-Wen Pan, Bang-Jiao Ye. Spin polarization and production rate studies of surface muons in a novel solenoid capture system based on CSNS.Nuclear Science and Techniques, 2017, 28(8): 109 doi: 10.1007/s41365-017-0261-4

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Abstract

Abstract:

A novel surface muon capture system with a large acceptance was proposed based on the China spallation neutron source (CSNS). This system was designed using a superconducting solenoid where a long graphite target was put inside it. Firstly, the spin polarization evolution was studied in a constant uniform magnetic field. As the magnetic field can interact with the spin of the surface muon, both the spin polarization and production rate of the surface muons collected by the new capture system were calculated by the G4beamline. Simulation results showed that the surface muons could still keep a high spin polarization (>90%) with different magnetic fields (0–10 T), and the larger magnetic field is, the more surface muons can be captured. Finally, the proton phase space, Courant–Snyder parameters, and intensities of surface muons of different beam fractions were given with magnetic fields of 0 and 5 T. The solenoid capture system can focus proton and surface muon beams and collect p_ and l_ particles. It can also provide an intense energetic positron source.

Key words: Surface muon, Muon spin rotation, Spin polarization, Superconducting solenoid, G4 beamline

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Spin polarization and production rate studies of surface muons in a novel solenoid capture system based on CSNS

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