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In accelerator-based spallation neutron sources, which include a rapid cycling synchrotron (RCS), the energy spread at the end of the linac is a crucial parameter that significantly impacts the operational efficiency of the downstream RCS ring. However, in recent years, the energy spread at the linac of the Chinese Spallation Neutron Source has been inadequately measured due to limited methods for longitudinal phase space measurement. This paper presents a study on measuring the energy spread using wall current monitors at the linac. The results indicate that the energy spread is at the 10⁻³ level, consistent with simulations. Nevertheless, the uncertainty remains relatively high, necessitating further efforts to improve measurement accuracy in the future.
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