Speaker
Description
The China Spallation Neutron Source (CSNS) passed national acceptance in 2018. Construction of the Phase‑II upgrade began in 2024 and will increase the beam‑on‑target power from 100 kW to 500 kW and raise the linac exit energy from 80 MeV to 300 MeV. The planned Phase‑III upgrade will replace the current drift‑tube linac (DTL) downstream of the radio‑frequency quadrupole (RFQ) with a superconducting linac, and will add further superconducting accelerating sections at the end of the Phase‑II linac to raise the linac beam energy above 1 GeV. Depending on the chosen upgrade scenario, the accelerator beam power could be increased into the 2–10 MW range. This paper presents several preliminary linac design options for the CSNS Phase‑III upgrade and outlines their basic beam‑physics design.
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