Study of the typical mixed radiation field induced by the beam loss in CSNS linac tunnel

In recent years, more and more electronics have been exposed to the mixed radiation field. The radiation resistance of electronics has been paid more and more attention to and the China Spallation Neutron Source (CSNS) linac tunnel provides a natural mixed radiation field. One of the radiation hotspots induced by beam loss when the CSNS linac regularly operates is the debuncher component in the beamline. The radiation level around the debuncher was measured by dose monitors and simulated by the FLUKA code simultaneously. The results of measurement and simulation are consistent, which means that the model simulated by the FLUKA code is consistent with the actual situation. The energy spectrum of the mixed radiation field at CSNS was first simulated by the FLUKA code. The mixed radiation field is composed of charged and neutral hadrons (protons and neutrons), photons, and electrons over a range of energies. This radiation field is suitable for the radiation damage effect tests of electronic components operating in the mixed radiation environment, especially for the electronic components used in the accelerator tunnel.