What question did this study set out to answer?

To optimize the transition section connecting new FFA arcs to the existing linac for a smoother beam path during the CEBAF upgrade.

February 2, 2026Open Access

Design update on the transition beamline for the CEBAF Energy Upgrade

Key Points

To optimize the transition section connecting new FFA arcs to the existing linac for a smoother beam path during the CEBAF upgrade.
Designed a transition section with two parts for beam dispersion and trajectory matching.
Utilized a genetic algorithm to optimize beam optics based on tight spatial constraints.
Investigated alignment of Twiss parameters at the linac entrance.
Developed initial designs for the transition section that meet matching requirements.
Identified key parameters for optimal beam optics during the upgrade.
Explored efficiencies of genetic algorithms in beam matching scenarios.

Abstract

For Jefferson Lab’s 22GeV upgrade, two new permanent-magnet Fixed-Field Alternating Gradient (FFA) arcs will be integrated to serve the accelerator’s six highest-energy recirculation passes. Connecting these FFA arcs to the existing linear accelerator (linac) requires a carefully engineered transition section. The current design has two parts where the first part adiabatically matches the beam dispersion and orbit trajectories, while the second part aligns the Twiss parameters (alpha and beta functions) with those at the linac entrance. Given the tight spatial constraints and multiple matching requirements, a genetic algorithm is being explored to optimize the beam optics matching. This paper presents the current progress in developing and optimizing this transition.

Design update on the transition beamline for the CEBAF Energy Upgrade

Key Points

Abstract

Cite This Study

Also Consider

Also Consider