Design and test of μSR detection system of EMuS at CSNS

EMuS (Experimental Muon Source) as the first muon source in China will be built at China Spallation Neutron Source (CSNS). A 128-channel μSR spectrometer prototype is under development for EMuS. As the core part of μSR spectrometer prototype, the detection system (detectors and readout electronics) has been constructed. Beam test (at ISIS Muon Source in U.K.) and magnetic shielding test have been carried out to test the performances of this detection system. In this paper, a new test method has been developed to test the magnetic shielding capability by using the energy spectrum of 22Na source. A magnetic field up to at least 30 Gauss can be eliminated by the proposed shielding. This satisfies the actual requirement of 8 Gauss. The dead time of the prototype detector was measured with a dedicated setup and measured to be 1.4 ns.