Charged transparent macroparticles of silicium carbide of radius r = 0.5 μm are submitted to the repeated radiation pressure of a laser beam which follows the sides of a square 3.5 × 3.5 m, using total reflection on three prisms. The macroparticles follow a closed path since they are deflected by a strong electric field, using magnetic insulation. After 4650 revolutions, velocities up to 106 km/s can be reached.