Speaker
Description
There is increasing global interest in developing high-power neutron spallation sources. ISIS, as one of the leading facilities in this field, aims to upgrade its existing 800 MeV, 200 kW accelerator to a next-generation machine delivering 1–2 GeV beam energy and 1–2 MW power.
Several upgrade scenarios are under consideration, including RCS, ACS, and FFA-based concepts. In all cases, a 500 MeV injector linac is required as the first stage of the accelerator complex to meet broad operational objectives. A central design goal is to maximize system sustainability, reliability, and maintainability under high-power operation.
Comparative studies indicate that, with suitable cavity design innovations, a normal-conducting (NC) linac can provide greater long-term sustainability and operational robustness than superconducting RF (SRF) technology within this energy range. However, for configurations such as an accumulator ring scenario reaching 1.8 GeV, the injector linac can be extended with additional medium- and high-beta SRF cavities to achieve the target energy while maintaining high efficiency.
This paper presents the overall linac design concept, discusses the main design parameters, and summarizes the results of beam dynamics simulations supporting the proposed upgrade path for the ISIS high-power spallation facility.
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