HIGH VOLTAGE FIELD ION MICROSCOPE, ITS DESIGN AND FIELD CALCULATION M. Tagawa, S. Koike, N. Inoue, N. Ohmae et M. Umeno J. Phys. Colloques, 48 C6 (1987) C6-583-C6-588 DOI: 10.1051/jphyscol:1987695