CBETA: First Multipass Superconducting Linear Accelerator with Energy Recovery.

Area of Science:

• Physics
• Engineering
• Accelerator Science

Background:

• Particle accelerators are crucial for research and industry.
• Existing linear accelerators face limitations in size, current, and energy consumption.
• Energy recovery offers a potential solution to these challenges.

Purpose of the Study:

• To demonstrate energy recovery in a multipass linear accelerator.
• To showcase a technology for more compact and efficient particle accelerators.
• To reduce energy consumption in high-current accelerator applications.

Main Methods:

• Utilized superconducting accelerating cavities and permanent magnets for high-energy efficiency.
• Implemented a fixed-field alternating-gradient optical system for beam transport.
• Achieved energy recovery through four accelerating and four decelerating passes.

Main Results:

• Successfully demonstrated energy recovery in an eight-pass energy recovery linac.
• Transported electron bunches at various energies (42, 78, 114, 150 MeV).
• Achieved high energy efficiency due to superconducting cavities and permanent magnets.

Conclusions:

• The demonstrated technology enables more compact particle accelerators.
• This approach significantly reduces energy consumption per electron.
• The energy recovery linac has potential for higher currents and smaller beam dimensions.