LINAC2026 - 33rd Linear Accelerator Conference

Design and Fabrication of a 4 kW RF Solid State Power Amplifier for SCL3 Heavy Ion Accelerator

Not scheduled

2h

Daejeon Convention Center

Poster Presentation MC4.A06: RF power sources and power couplers Poster Session

Speaker

Ki Taek Son (Institute for Basic Science)

Description

The Superconducting Linac 3 (SCL3) of the RAON heavy ion accelerator uses quarter wave resonator (QWR) cavities at 81.25 MHz and half wave resonator (HWR) cavities at 162.5 MHz. Each cavity is driven by a dedicated 4 kW solid state power amplifier (SSPA). This paper presents the design and fabrication of a domestically developed spare SSPA unit for SCL3. The amplifier uses six 900 W power amplifier (PA) pallets, and their outputs are combined through low loss combiners to produce 4 kW continuous wave (CW) and pulsed RF output. A dual circulator protection structure is used to protect the amplifier under full reflection conditions at any reflection phase. This structure includes 1 kW circulators at the PA pallet level and a 5 kW circulator at the system output stage. In addition, EPICS based real time monitoring and dual channel interlock functions are implemented to improve operational reliability. Performance test results confirm that the fabricated SSPA satisfies the main requirements for output power, efficiency greater than 45%, phase stability, and amplitude stability.