Three-Dimensional Force Field Measurements in the Void of Dusty Plasmas Under Microgravity Conditions

In dusty plasmas, when the gravitational force on the particles is compensated, usually an extended dust cloud with a central dust-free void emerges. Fast particles are injected into the void and followed along their trajectories in three dimensions. They act as probes to measure the forces forming the void. An image illustrating this three-dimensional resolved force field inside the void is presented.