Speaker
Description
The China Spallation Neutron Source (CSNS) target station converts high energy (1.6GeV,62.5µA) protons into lower-energy, short-pulsed neutron beams optimized for the neutron scattering instruments. The interaction between the pulsed high-energy proton beam with the light water-cooling tungsten target produces the fast neutrons through the spallation reaction. Then the fast neutron will be moderated into short the cold, thermal and epithermal neutrons by the decoupled and poisoned hydrogen moderator, the coupled hydrogen moderator and the ambient decoupled water moderator. These moderators provide neutron pulses with different energy spectra to satisfy the requirements from various neutron instruments. The CSNS target station uses the flat tungsten target plates and the single layer container to reduce the distance between the tungsten target and the moderators. This compact mode makes the CSNS target station has very high neutron efficiency. Now the CSNS target station operates safely and stably. When CSNS upgrades to 500KW during its Phase II, the target station also uses the fixed solid target and keep the target-moderator compact mode. The biggest challenge is to replace the T-M-R under the high radiation environment and keep the high neutron efficiency of the target station. We also have to consider the abnormal situations and classify the safety level. We also initiate the design of 10MW CSNS III and propose the primary design of the target station.