Abstract
The China Spallation Neutron Source (CSNS) has been operational for five years. As the beam power increased from 10 kW to 140 kW, the radio frequency (RF) pulse width also increased, leading to an increased cavity frequency detuning along with the beam pulse width. Simulations were conducted to analyze the frequency shift of the drift tube linac (DTL) cavities under a pulse width of 650 μs and a repetition frequency of 25 Hz. These simulations investigated the contributions of the cavities' components to the frequency offset, and the results were consistent with the operating data. To evaluate the frequency detuning of the cavities in CSNS-Ⅱ with an extended pulse width, the sensitivity of frequency detuning to different pulse widths and inlet water temperature was assessed. The results indicate that the cavity detuning caused by an extended pulse width can be compensated by reducing the inlet water temperature or adjust the insertion depth of movable tuners in CSNS-Ⅱ.
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