The joint beam commissioning among accelerators, target station and instruments started in the China Spallation Neutron Source (CSNS) on November 1, 2017.

At about 15:00 p.m., the proton beam pulses with repetition rate of 1Hz at an average beam power of 300~400W from accelerator collided on the tungsten target.

All systems of the target station were operating smoothly. Continuous cold and thermal neutron pulse from three types of moderator were output for neutron instruments, while the target imaging system successfully captured the proton beam imaging on the target.

Up until 21:00 p.m., detectors of all three Phase-I instruments, including the General-Purpose Powder Diffractometer (GPPD), the Small-Angle Neutron Scattering instrument (SANS) and the Multi-purpose Reflectometer (MR), measured the neutron signals.

The neutron beam was successfully obtained for the first time at the China Spallation Neutron Source (CSNS) on 28^th August. This is a great milestone for the CSNS project, marking the completion of the main construction and entering into the test operation phase.