Speaker
Description
The accurate modeling and mitigation of coherent synchrotron radiation (CSR) represents an important challenge in the design of high-brightness beam transport systems. Widely used beam-dynamics codes typically employ a 1D line-charge approximation, reducing CSR to a longitudinal wake that is uniform across the bunch. While computationally efficient, this approach neglects transverse beam structure and becomes unreliable for beams with high transverse-longitudinal aspect ratios. Although 2D/3D CSR implementations exist, existing approaches sacrifice at least one of: a full 3D beam distribution, entry/exit wake treatment, conducting-wall shielding, or self-consistency. In this work, we present a new simulation approach that achieves fully 3D, self-consistent CSR calculation by extending the 1D framework of Mayes and Hoffstaetter (2009) to a set of transversely staggered integration lines. At each timestep, the beam distribution is represented in a co-moving frame as a weighted sum of smooth 3D shape functions, which simplifies the retardation condition while keeping the memory footprint low — enabling the natural inclusion of shielding via image charges. We will discuss the theoretical foundations of this approach and its computational characteristics relative to existing methods. The technique is currently being applied to study the boundary between 1D and 3D CSR regimes, to characterize transient and steady-state shielded wake dynamics, and to support multi-parameter optimization of shielding geometries in concert with beam profile shaping for CSR mitigation. This work is part of a larger investigation into CSR effects on beam dynamics that includes experimental analysis at the Argonne Wakefield Accelerator (AWA).
This research was supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics under Award DE-SC0024445.
| Working group | WG5 |
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