CEPC 650 MHz Superconducting Cavities Achieve Ultrahigh Gradient
The gradients of large (frequency < 1 GHz) superconducting cavities had never previously reached 40 MV/m in China because of low frequency, large volume and surface area. Furthermore, few large cavities have been able to reach the gradient of 40 MV/m abroad either. This time, both 650 MHz single-cell cavities exceeded 40 MV/m at IHEP, which lays the foundation for high Q research in the future.
Fig. Vertical test results of CEPC 650 MHz single-cell cavities (Image by IHEP)
Mr. GUO Lijun