Cros, B. Audet, T. Chancé, A. Delerue, N. Delferrière, O. Dobosz-Dufrénoy, S. Lee, P. Maitrallain, A. Maynard, G. Monot, P. Mosnier, A. Schwindling, J. Specka, A. JACoW Geneva, Switzerland 978-3-95450-182-3 10.18429/JACoW-IPAC2017-WEPVA001 English 3244-3246 WEPVA001 electron laser plasma simulation acceleration Contribution to a conference proceedings 2017 2017-05 http://dx.doi.org/10.18429/JACoW-IPAC2017-WEPVA001 http://jacow.org/ipac2017/papers/wepva001.pdf An electron injector in the 50-200 MeV range, based on laser wakefield acceleration, is studied in the context of multi-stage laser plasma acceleration. Test experiments carried out at the UHI100 laser facility show that electron bunches in the 100 MeV range, generated by ionization-induced injection mechanism, and accelerated by laser driven wakefield in a mm-scale length plasma can be transported using a magnetic line and precisely analysed. A comparison with simulation results provides insights on electron dynamics and indicates ways to optimize the injector.