Abstract
The tuning of four-vane type radio-frequency quadrupole (RFQ) linacs is difficult, mainly because the resonant frequencies of the dipole modes are close to that of the accelerating mode. In order to avoid any dipole mode mixing, several pairs of the vane coupling rings (VCRs), which provide periodic electrical connections between diametrically opposite vanes, have been mainly used so far. However, the VCR is difficult to fabricate and is less reliable under high-duty operation. Thus, a new field stabilization concept is proposed and is referred to as a π-mode stabilizing loop (PISL). This concept is based on mode stabilization by magnetic coupling between two neighboring quadrant cavities with closed loop couplers. The results of calculations using the MAFIA code package indicate that the PISL to be fabricated is quite promising for mode stabilization.
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