A Quantal, Partially Ordered Electron Structure as a Basis for a \gamma Free Electron Laser (\gamma-FEL)
2012
When a rather cold electron bunch is transported during laser bubble acceleration in a strongly focusing plasma channel with typical forces of 100 GeV/m, it will form partially ordered long electron cylinders due to the relativistically longitudinal reduced repulsion between electrons, resulting in a long-range pair correlation function, when reaching energies in the laboratory above 0.5 GeV. During Compton back-scattering with a second laser, injected opposite to the electron bunch, the electron bunch will be further modulated with micro bunches and due to its ordered structure will reflect coherently, M\"ossbauer-like, resulting in a \gamma free electron laser (\gamma-FEL). Increasing the relativistic \gamma factor, the quantal regime becomes more dominant. We discuss the scaling laws with \gamma.
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