The ground-based device simulates the potential energy (voltages) between gravity and magnetic seas. The gravity generator (GG) generated currents and voltages on the mesoscopic scale in the vacuum. Gravity interacts to generate electricity in the Earth's direction or the opposite direction by the repulsive magnetic force. A trapped gravity was set to behave as free relativistic quantum particles or fluids, which made it possible to measure the particle position as a function of time. Our result is grounded on a rigorous proof based on numerical and analytic computations, which took it accessible to study the magnetic sea for different initial superposition of positive- negative-gravity spinor state. It might explain the relativistic quantum gravity and the heating mechanism of the Sun.