Scaling fixed-field alternating gradient accelerators with a small orbit excursion.

Area of Science:

• Particle Accelerators
• Accelerator Physics
• High-Energy Physics

Background:

• Conventional scaling and nonscaling fixed-field alternating gradient (FFAG) accelerators face significant challenges.
• Orbit excursion and beam size growth due to errors are critical limitations in current FFAG designs.

Purpose of the Study:

• To propose a novel scaling type of FFAG accelerator.
• To address and solve major problems associated with conventional FFAG accelerator types.
• To achieve significantly smaller orbit excursion and minimize beam size growth.

Main Methods:

• Development of a novel scaling FFAG accelerator design.
• Utilizing a larger field index (k) to reduce orbit excursion.
• Implementing a triplet focusing structure.
• Operating within the second stability region of Hill's equation.

Main Results:

• The proposed scaling FFAG achieves a substantially smaller orbit excursion, approximately 5 times smaller than conventional scaling FFAGs.
• The beam size growth due to typical errors is limited to at most 10%.
• The design demonstrates reasonable sensitivity to various errors.

Conclusions:

• The novel scaling FFAG accelerator effectively solves major problems of conventional types.
• This design offers a promising path toward more compact and stable FFAG accelerators.
• The improved performance makes it suitable for advanced applications requiring precise beam control.