Strategies towards a compact XUV free electron laser adopted for the LUNEX5 project. - Couprie, M. E.; Labat, M.; Evain, C.; Szwaj, C.; Bielawski, S.; Hubert, N.; Benabderrahmane, C.; Briquez, F.; Chapuis, L.; Marteau, F.; Valléau, M.; Marcouillé, O.; et al. (Journal of Modern Optics, 2016)