Fourth generation switching power supply for circular induction accelerators

Area of Science:

• High Energy Physics
• Accelerator Technology
• Power Electronics

Background:

• Switching power supplies (SPS) are crucial for high-voltage pulse generation in circular accelerators like induction synchrotrons.
• Previous SPS generations powered novel accelerators proposed at KEK since 2006.

Purpose of the Study:

• To develop a fourth-generation SPS for circular induction accelerators.
• To incorporate high-speed silicon carbide (SiC) Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) for improved performance.
• To enhance thermal management and operational monitoring capabilities.

Main Methods:

• Utilized newly developed 3.3 kV SiC MOSFETs in a parallel configuration for heat dissipation.
• Optimized bus patterns to reduce parasitic capacitance and improve drain-source voltage (VDS) balance.
• Integrated current sampling circuits for operational status monitoring.

Main Results:

• The new SPS achieved a 2.5 kV-17.4 A bipolar output at 350 kHz in continuous mode.
• The highest MOSFET junction temperature was recorded at 98°C, indicating effective thermal management.
• Demonstrated improved VDS balance and efficient heat shunting.

Conclusions:

• The fourth-generation SPS represents a significant advancement in power supply technology for particle accelerators.
• The use of SiC MOSFETs and optimized design ensures reliable and efficient operation at high frequencies and voltages.
• This technology is suitable for large-scale accelerator applications requiring precise pulse generation.