Speaker
Description
The China Spallation Neutron Source (CSNS) is an accelerator-based science facility. CSNS is designed to accelerate proton beam pulses to 1.6 GeV kinetic energy, striking a solid metal target to produce spallation neutrons. CSNS has two major accelerator systems, a linear accelerator (80 MeV Linac) and a 1.6 GeV rapid cycling synchrotron (RCS). The RCS accumulates and accelerates the proton beam to 1.6 GeV and then extracts the beam to the target at the repetition rate of 25 Hz. The Beam commissioning of CSNS/RCS had been started since April 2017. At the end of February 2020, CSNS reached the design beam power of 100-kW with very low uncontrolled beam loss. The most important issue in high-intensity beam commissioning is the beam loss control, as well as the control of induced activities, to meet the requirement of manual maintenance. The beam intensities attainable in CSNS/RCS are mainly limited by beam loss induced by collective effects, e.g. space-charge forces, beam instabilities, and stripping foil scattering. A series of solutions were proposed to mitigate collective effects. After the beam loss optimization, a 100-kW beam operation with very low uncontrolled beam loss was established at the end of February 2020.
