LINAC2026 - 33rd Linear Accelerator Conference

FPGA-Based Frequency Shift Correction for Linear Accelerators

Not scheduled

2h

Daejeon Convention Center

Poster Presentation MC4.A04: Low level RF Poster Session

Speaker

Osman Emre Delialioglu (The Graduate University for Advanced Studies, SOKENDAI)

Description

The muon high-precision (g-2)/EDM experiment, which is planned at the J-PARC, utilizes the world’s first dedicated muon linear accelerator (linac), requiring stringent Radio-Frequency (RF) field stability. The Radio Frequency Quadrupole (RFQ), the linac's initial stage, experiences frequency shifts that cause operation outside the RFQ bandwidth. Due to budget constraints, conventional tuning methods are impractical. This study presents a real-time digital feedback system developed within a Low-Level RF (LLRF) framework to maintain frequency-shifted operation and to correct IQ time variations caused by the frequency shifts, which was implemented on a Field-Programmable Gate Array (FPGA), proving a cost-effective and compact solution. This approach eliminates the need for additional external hardware such as dedicated tuners. Following the successful validation using a simulation test cavity, the system was integrated with the actual RFQ. This system met the stability requirements for achieving muon beam acceleration tests. This LLRF-based approach ensures beam integrity and represents a significant milestone towards achieving the precision goals of the J-PARC experiment.