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

Understand

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.