We investigate the generation of polarized betatron radiation in laser wakefield accelerators. Due to the isotropic fields of the wakefield cavity, betatron oscillations usually have no preferential direction and hence, the resulting betatron radiation is unpolarized. However, interaction with the laser pulse can induce oscillations along the laser’s polarization axis. We use particle-in-cell simulations to study two different interaction regimes, namely electron-laser interactions during the injection phase  and late acceleration phase [2,3], regarding their potential to generate highly polarized femtosecond X-rays.
 A. Döpp, et al. Stable femtosecond X-rays with tunable polarization from a laser-driven accelerator. Light: Science & Applications 6, e17086 (2017)
 J. Shaw et al. Role of Direct Laser Acceleration of Electrons in a Laser Wakefield Accelerator with Ionization Injection. Physical Review Letters 118, 064801 (2017)
 I. Gallardo González et al. Effects of the dopant concentration in laser wakefield and direct laser acceleration of electrons. New J. Phys. 20, 053011 (2018)
|Working group||Secondary radiation generation & applications|