Fast wave tubes using periodic focusing fields

Claim 1

IN A HIGH FREQUENCY CHARGED PARTICLE DISCHARGE APPARATUS, MEANS FOR FORMING A SOURCE OF CHARGED PARTICLES, MEANS FOR FORMING AND PROJECTING SAID CHARGED PARTICLES OVER A PREDETERMINED BEAM PATH, SAID BEAM OF CHARGED PARTICLES HAVING A CHARGE DENSITY GREAT ENOUGH TO PRODUCE SUBSTANTIALLY SEPARATED FAST AND SLOW SPACE CHARGE WAVES, MEANS DISPOSED ALONG SAID BEAM PATH TO PERIODICALLY PERTURB PARTICLE TRAJECTORIES OF SAID BEAM TO PRODUCT A SPATIAL HARMONIC OF SAID SLOW SPACE-CHARGE WAVE OF SAID BEAM, MEANS AT THE TERMINAL END OF SAID BEAM PATH FOR COLLECTING SAID PARTICLES, MEANS DISPOSED ALONG SAID BEAM PATH FOR PROPAGATING AN ELECTROMAGNETIC WAVE IN ENERGY EXCHANGING RELATIONSHIP TO SAID BEAM, SAID WAVE PROPAGATING MEANS BEING DIMENSIONED AND ARRANGED TO SUPPORT A WAVE WITH A PHASE VELOCITY SUCH THAT THE WAVE WILL CUMULATIVELY INTERACT WITH THE SPATIAL HARMONIC OF SAID SLOW SPACECHARGE WAVE OF SAID BEAM OF CHARGED PARTICLES WITHIN SAID PATH TO PRODUCE A NET TRANSFER OF ENERGY BETWEEN SAID SPATIAL HARMONICS OF SAID BEAM OF CHARGED PARTICLES AND SAID ELECTROMAGNETIC WAVE ENERGY ON SAID ELECTROMAGNETIC PROPAGATING MEANS.