On November 9th, at the China Spallation Neutron Source (CSNS), an average beam power of 10 kW was achieved when a proton beam with a repetition rate of 25 Hz struck on the tungsten target. This means the average beam power has met the acceptance goal of the CSNS project, marking another major step forward after the first beam was obtained in late August.
CSNS is composed of a linac with a modest but upgradable energy of 80 MeV, and a rapid cycling synchrotron (RCS) with energy of 1.6 GeV and repetition rate of 25 Hz. At present the linac can only provide an energy of 60 MeV, since one of the four klystrons for the drift tube linac (DTL) was returned to the factory in the USA due to a quality problem.
In April, the linac finished beam commissioning with the beam energy of 60 MeV. In July, the proton beam was accelerated to 1.6 GeV in the RCS. To reduce the beam loss, the CSNS team used single-shot mode for beam commissioning. On August 28th, the first neutron beam was obtained from the tungsten target.
On November 1st, the CSNS team began to provide beam with a repetition rate of 1 Hz, and received neutron signals at all three initial instruments during a joint beam commissioning. On November 9th, the proton beam pulses, with a repetition rate of 25 Hz struck on the tungsten target, which received an average beam power of more than 10 kW.
Imaging of the Proton Beam on Fluorescent Materials (Image by IHEP)
International Office, Institute of High Energy Physics