Ghaith, A. Andriyash, I.A. André, T. Bielawski, S. Blache, F. Bouvet, F. Briquez, F. Corde, S. Couprie, M.-E. Dietrich, Y. Duval, J.P. Evain, C. Gautier, J. Herbeaux, C. Hubert, N. Kitegi, C.A. Labat, M. Lambert, G. Leclercq, N. Lestrade, A. Loulergue, A. Mahieu, B. Malka, V. Marcouillé, O. Marteau, F. Oumbarek, D. Phuoc, K.T. Rommeluère, P. Roussel, E. Sebdaoui, M. Szwaj, C. Tavakoli, K.T. Thaury, C. Valléau, M. JACoW Publishing Geneva, Switzerland 978-3-95450-206-6 10.18429/JACoW-FLS2018-TUA2WC01 English 56-61 TUA2WC01 ion electron laser undulator plasma Contribution to a conference proceedings 2018 2018-06 https://doi.org/10.18429/JACoW-FLS2018-TUA2WC01 http://jacow.org/fls2018/papers/tua2wc01.pdf The ERC Advanced Grant COXINEL aims at demonstrating free electron laser amplification, at a resonant wavelength of 200 nm, based on a laser plasma acceleration source. To achieve the amplification, a 10 m long dedicated transport line was designed to manipulate the beam qualities. It starts with a triplet of permanent magnet with tunable gradient quadrupoles (QUAPEVA) that handles the highly divergent electron beam, a demixing chicane with a slit to reduce the energy spread per slice, and a set of electromagnetic quadrupoles to provide a chromatic focusing in a 2 m long cryogenic undulator. Electrons of energy 176 MeV were successfully transported throughout the line, where the beam positioning and dispersion were controlled efficiently thanks to a specific beam based alignment method, as well as the energy range by varying the slit width. Observations of undulator radiation for different undulator gaps are reported.