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A new muon and pion capture system is proposed for the China SpallationNeutron Source (CSNS), currently under construction. Using about 4\% of thepulsed proton beam (1.6 GeV, 4 kW and 1 Hz) of CSNS to bombard a cylindricalgraphite target inside a superconducting solenoid, both surface muons and pionscan be acquired. The acceptance of this novel capture system - a graphitetarget wrapped up by a superconducting solenoid - is larger than the normalmuon beam lines using quadrupoles at one side of the separated muon target. Themuon and pion production at different capture magnetic fields was calculatedusing Geant4. The bending angle of the capture solenoid with respect to theproton 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 rotationareas (surface, decay and low-energy muons). Finally, high-flux surface muons(10$^8$/s) and decay muons (10$^9$/s) simulated by G4beamline will be availableat the end of the decay solenoid based on the first phase of CSNS. Thiscollection and transport system will be a very effective beam line at a protoncurrent of 2.5 $\mu$A.

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