Optimization of a Ni-like X-ray laser at 13.9 nm pumped by 100 ps pulses D. Ros, A. Klisnick, P. Fourcade, A. Carillon, G. Jamelot, P. Jaeglé, Ph. Zeitoun, S. Hubert, S. Jacquemot, L. Bonnet, D. Joyeux et D. PhalippouJ. Phys. IV France, 11 PR2 (2001) Pr2-143-Pr2-146DOI: https://doi.org/10.1051/jp4:2001227