Laser Plasma Accelerators (LPA) rely on our ability to control the electrons motion with intense laser pulses . The manipulation of such relativistic electrons allows a fine mapping of the longitudinal and radial components of giant electric fields with values that can exceed hundreds of GV/m . This control is crucial to optimize the design of laser plasma accelerators for delivering ultra-short and ultra-bright energetic particle or radiation beams. To illustrate the beauty of laser plasma accelerators I will show some concepts that give improvements the quality of the electron beam, its stability  and its energy gain , and its divergence . I will then show how by controlling the quiver motion of relativistic electrons intense and bright X-rays beam are produced in a compact and elegant way [6-8]. Finally I will show some examples of applications.
 V. Malka, Europhysics Letters, 115 (2016) 54001
 V. Malka et al., Science 22, 298 (2002)
 E. Guillaume et al., Phys. Rev. Lett. 115, 155002 (2015)
 C. Thaury et al., Scientific Report, 10.1038, srep16310, (2015)
 C. Thaury et al., Nature Comm. 6, 6860 (2015)  K. Ta Phuoc et al., Nature Photonics 6, 308-311 (2012)  S. Corde et al., Review of Modern Phys. 85 (2013)
 I. Andriyash et al., Nature Comm. 5, 4736 (2014)
Peter Thirolf (LMU) / Norbert Kaiser (TUM)