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An upgrade of the High-Intensity Proton Injector (IPHI) at Saclay is currently under study. Among the options considered, this paper investigates the feasibility of a new Radio Frequency Quadrupole (RFQ). This RFQ would build upon operational feedback from both the IPHI and ESS RFQs and operate at the same frequency of 352.21 MHz. Unlike the existing RFQ, divided into three 2-m-long RF segments, the new design would consist of a single 6-m RF segment. It would accelerate a reduced beam current, from 100 to 55 mA, while increasing the output energy from 3 to 5 MeV. The required RF power could be reduced to maintain compatibility with the current RF power supply. Power would be injected through loop couplers similar to those used on the ESS RFQ. However, their average power capability must be significantly increased to handle the 70% duty cycle, compared to 5% for ESS. This paper describes the beam dynamics design process and presents the resulting RF design.
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