Figure 4
Maps obtained translating the MCP along the z-axis (i.e. changing the distance between the MCP and the CCD). The color bar refers to the radiation intensity. The area in each panel is constant (20 × 20 pixels) and the xy-axes are expressed in pixels. The map of the incident beam is top left while other maps correspond to distances of 25, 50 and 60 mm along the z-axis. |