A Quantal, Partially Ordered Electron Structure as a Basis for a Free Electron Laser (-FEL).

Institut Laue-Langevin, F-38042 Grenoble, France(Dated: June 6, 2012)When a rather cold electron bunch is transported during laser bubble acceleration in a stronglyfocusing plasma channel with typical forces of 100 GeV/m, it will form partially ordered long electroncylinders due to the relativistically longitudinal reduced repulsion between electrons, resulting in along-range pair correlation function, when reaching energies in the laboratory above 0.5 GeV. DuringCompton back-scattering with a second laser, injected opposite to the electron bunch, the electronbunch will be further modulated with micro bunches and due to its ordered structure will reflectcoherently, Mossbauer-like, resulting in a γ free electron laser (γ-FEL). Increasing the relativistic γfactor, the quantal regime becomes more dominant. We discuss the scaling laws with γ.