Description
The transverse coupled-bunch instability (TCBI) has been observed in the rapid cycling synchrotron (RCS) of the China Spallation Neutron Source. Subsequent measurements indicated that the RF shield of the ceramic chambers exhibits a resonant impedance in the low-frequency range, preliminarily suggesting it is responsible for the instability. The RF shield has been carefully simulated to further confirm the source and explore the characteristics of the resonance. The results show that the impedance depends on the material of the RF shield, and the capacitance, inductance, and resistance of the lumped electronic components. In conclusion, the resonant impedance of the RF shield is identified as the source of the TCBI in the RCS. Furthermore, optimization of the impedance can potentially achieve high beam power in the RCS.
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