Traveling wave tube

Claim 1

A TRAVELING WAVE TUBE COMPRISING AN ELECTRON SOURCE; MEANS FOR DIRECTING A BEAM OF ELECTRONS FROM SAID SOURCE ALONG AN EXTENDED PATH, SAID ELECTRON BEAM HAVING A FIRST SPACE CHARGE WAVE TRAVELING AT A VELOCITY GREATER THAN THAT OF SAID ELECTRONS AND A SECOND SPACE CHARGE WAVE TRAVELING AT A VELOCITY LESS THAN THAT OF SAID ELECTRONS; HELICAL DELAY LINE MEANS BEING POSITIONED ADJACENT SAID EXTENDED PATH AND INCLUDING FIRST AND SECOND INTERCONNECTED HELICAL DELAY LINE SECTIONS, SAID SECOND HELICAL SECTION INCLUDING ATTENUATION MEANS FOR PREVENTING BACKWARD WAVE OSCILLATIONS WITHIN SAID TRAVELING WAVE TUBE; MEANS FOR PROPAGATING AN ELECTROMAGNETIC WAVE ALONG SAID FIRST AND SECOND HELICAL SECTIONS, THE PITCH OF SAID FIRST HELICAL SECTION BEING SELECTED TO PROVIDE AN INTERACTION BETWEEN SAID ELECTROMAGNETIC WAVE AND SAID FIRST SPACE CHARGE WAVE AND THE PITCH OF SAID SECOND HELICAL SECTION BEING SELECTED TO PROVIDE AN INTERACTION BETWEEN SAID ELECTROMAGNETIC WAVE AND SAID SECOND SPACE CHARGE WAVE, THE LENGTH OF SAID FIRST HELICAL SECTION BEING ADJUSTED SO AS TO REDUCE THE NOISE ASSOCIATED WITH SAID ELECTROMAGNETIC WAVE TO A MINIMUM; OUTPUT COUPLING MEANS CONNECTED TO SAID SECOND HELICAL SECTION FOR REMOVING SAID ELECTROMAGNETIC WAVE FROM SAID TRAVELING WAVE TUBE.