Other proposed variants include the fusion of hydrogen in the plasma gas stream of charged particles. Using a magnetic field, the plasma is displaced from the engine and creates thrust. Another idea is to use the electric field for emission from the engine of ions (charged atoms) of mercury or cesium. The tests confirmed the efficiency of this system, although created with this pull incredibly had only 1 kg for every 4 million watts of electricity consumed. However, with the gradual acceleration over many months, such a missile in the end can develop huge speed.
Previously considered another possibility, which came to mind science fiction writers, photon engine produces thrust by radiation of the flux of light quanta. However, just a focused beam of light produced by the photon thrust will not be able to compete even with minimal thrust ion engine.
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