Fig. 9From: An in-flight plasma diagnostic package for spacecraft with electric propulsionVariation of the (a) plasma potentials and (b) ion energies for different potentials of the hot filament. The plasma sensor and the cylindrical Langmuir probe were at distances of 18 cm from the beam axis on opposite sides of the chamber. The 100 μm tungsten hot filament was heated by a current of 1.7 A, the potential drop along the filament was 13.6 VBack to article page