Figure 3
Imaging of the flowing helium plasma excited by the collimated ion beam. Upper image: schematic representation of the interaction between the collimated carbon ion beam and the helium jet. Images of the flowing plasma as function of gas density (in 1018 cm−3): (a) 2.3, (b) 3.4, (c) 3.9, (d) 4.6, (e) 5.0. The contrast/luminosity of the images have been altered to highlight the qualitative characteristics of the flowing afterglow.
