Speaker
Description
Coherent transition radiation (CTR) provides a powerful link between the spa-
tiotemporal structure of relativistic electron bunches and the electromagnetic
fields they emit, underpinning a wide range of beam diagnostics and radiation
sources. Despite its long standing theoretical foundation, existing frameworks
of CTR are historically restricted to simplified beam geometries. We introduce
a unified, first-principles framework for CTR that is applicable to arbitrary
three-dimensional electron bunches. Beginning with the classical Ginzburg-Frank
formulation, we develop a systematic and tutorial-driven description of coherent
emission in terms of the bunch form factor, establishing it as the central quan-
tity governing spectral and angular radiation characteristics. We further present
a general numerical pipeline that enables the computation of CTR spectra from
structured electron beams beyond conventional models, particularly from exam-
ples such as Gaussian, orbital angular momentum, and Airy-like distributions.
By extending CTR theory to fully structured beams, this work establishes a
new and generalizable foundation for interpretation of experimental measure-
ments, designing next-generation beam diagnostics, and exploring previously
inaccessible regimes of structured, broadband radiation sources.
| Working group | WG5 |
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