Error analysis and RF optimization of a compact RFQ

A 162.5 MHz, 7.2 MeV 4-rod radio frequency quadruples (RFQ) dynamics design has been studied for injector of a carbon ion cancer therapy facility which is promoted by the Institution of Modern Physics (IMP) of the Chinese Academy of Science (CAS). A detailed error analysis was performed after the optimization process. Field flatness error is analysed for determining a RF optimization target. The RF structure is designed based on a new type dynamics design. Electric field of the RF structure is optimized in order to support the dynamics design. The error analysis and detailed field flatness optimization of this compact RFQ have been presented and discussed in this paper.