Aerodynamic focusing of clusters into a high intensity and low divergence supersonic beam H. Vahedi Tafreshi, G. Benedek, P. Piseri, S. Vinati, E. Barborini and P. Milani Eur. Phys. J. AP, 16 2 (2001) 149-156 Published online: 15 November 2001 DOI: 10.1051/epjap:2001204