Fig. 8
From: Low-energy particle experiments–ion mass analyzer (LEPi) onboard the ERG (Arase) satellite
Energy-elevation angle response of LEPi obtained in laboratory experiments. Responses of azimuthal channel 4 (wide channel) and 9 (narrow channel) for proton beams with the energy of 12 keV are shown. Contour lines correspond to 5 (blue), 25 (light-blue), 45 (cyan), 65 (yellow), and 85% (orange) of the maximum sensitivity level. Negative voltage is applied to the inner dome of the analyzer to measure the positively charged ions, although the energy per applied voltage in the figure is expressed as positive