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Chinese Physics C> 2016, Vol. 40> Issue(5) : 057004 DOI: 10.1088/1674-1137/40/5/057004

A new muon-pion collection and transport system design using superconducting solenoids based on CSNS

  • 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.

      Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China

  • A new muon and pion capture system is proposed for the China Spallation Neutron Source(CSNS), currently under construction. Using about 4% of the pulsed proton beam(1.6 GeV, 4 kW and 1 Hz) of CSNS to bombard a cylindrical graphite target inside a superconducting solenoid, both surface muons and pions can be acquired. The acceptance of this novel capture system-a graphite target wrapped up by a superconducting solenoid-is larger than the normal muon beam lines using quadrupoles at one side of the separated muon target. The muon and pion production at different capture magnetic fields was calculated using Geant4. The bending angle of the capture solenoid with respect to the proton beam was also optimized in simulation to achieve more muons and pions. Based on the layout of the muon experimental area reserved at the CSNS project, a preliminary muon beam line was designed with multi-purpose muon spin rotation areas(surface, decay and low-energy muons). Finally, high-flux surface muons(108/s) and decay muons(109/s) simulated by G4beamline will be available at the end of the decay solenoid based on the first phase of CSNS. This collection and transport system will be a very effective beam line at a proton current of 2.5μupA.
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  • References

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Ran Xiao, Yan-Fen Liu, Wen-Zhen Xu, Xiao-Jie Ni, Zi-Wen Pan and Bang-Jiao Ye. A new muon-pion collection and transport system design using superconducting solenoids based on CSNS[J]. Chinese Physics C, 2016, 40(5): 057004. doi: 10.1088/1674-1137/40/5/057004
Ran Xiao, Yan-Fen Liu, Wen-Zhen Xu, Xiao-Jie Ni, Zi-Wen Pan and Bang-Jiao Ye. A new muon-pion collection and transport system design using superconducting solenoids based on CSNS[J]. Chinese Physics C, 2016, 40(5): 057004.  doi: 10.1088/1674-1137/40/5/057004 shu
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Received: 2015-10-10
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    Supported by National Natural Science Foundation of China(11527811)

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A new muon-pion collection and transport system design using superconducting solenoids based on CSNS

    Corresponding author: Bang-Jiao Ye,
  • 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.  Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
  • Received Date: 2015-10-10
  • Available Online: 2016-05-05
Fund Project:  Supported by National Natural Science Foundation of China(11527811)

Abstract: A new muon and pion capture system is proposed for the China Spallation Neutron Source(CSNS), currently under construction. Using about 4% of the pulsed proton beam(1.6 GeV, 4 kW and 1 Hz) of CSNS to bombard a cylindrical graphite target inside a superconducting solenoid, both surface muons and pions can be acquired. The acceptance of this novel capture system-a graphite target wrapped up by a superconducting solenoid-is larger than the normal muon beam lines using quadrupoles at one side of the separated muon target. The muon and pion production at different capture magnetic fields was calculated using Geant4. The bending angle of the capture solenoid with respect to the proton beam was also optimized in simulation to achieve more muons and pions. Based on the layout of the muon experimental area reserved at the CSNS project, a preliminary muon beam line was designed with multi-purpose muon spin rotation areas(surface, decay and low-energy muons). Finally, high-flux surface muons(108/s) and decay muons(109/s) simulated by G4beamline will be available at the end of the decay solenoid based on the first phase of CSNS. This collection and transport system will be a very effective beam line at a proton current of 2.5μupA.

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