Fig. 8
From: An in-flight plasma diagnostic package for spacecraft with electric propulsion
LP measurements at different plasma potentials in the HIBEX test chamber with the gridded ion source. The plasma potential is manipulated by means of the cathode (hot filament) bias voltage. The indicated plasma potentials at +8.1 V, +19.5 V, and +36.7 V, and the floating potentials at −12.8 V, +5.6 V, and +28.7 V are found for cathode voltages of −10 V, +10 V, and +35 V, respectively