In the process, the plasma chamber posses plasma during operation of the resonance line width within the frequency comb corresponding to self resonance frequency, so that the average relative energy between electrons and ions is large. The Coulomb collision probability is reduced so that the loss of electrons from the magnetic containment is controlled. Any electrons still escaping are reflected back into the magnetic containment by electric fields. The resonance loss that occurs in electron-cyclotron resonance heating of electrons to considerable energies is compensated with frequency comb. The resonance requirement is satisfied in one place, up to a maximum energy Emax.
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