Collector arrangement for collecting unfavorably phase focused electrons

Claim 1

IN A CROSSED FIELD TRAVELLING WAVE ELECTRON DISCHARGE DEVICE, A SLOW-WAVE STRUCTURE, A SOLE ELECTRODE DISPOSED ADJACENT SAID SLOW-WAVE STRUCTURE AND SPACED THEREFROM TO FORM AN INTERACTION SPACE THEREBETWEEN, MEANS INCLUDING A CATHODE FOR PRODUCING AND DIRECTING AN ELECTRON BEAM ALONG SAID INTERACTION SPACE, MEANS FOR PROVIDING A MAGNETIC FIELD TRANSVERSE TO THE PATH OF THE BEAM ALONG SAID INTERACTION SPACE, A PLURALITY OF COLLECTOR ELECTRODES DISPOSED ALONG SAID INTERACTION SPACE AND PROJECTING THROUGH SAID SOLE ELECTRODE TO REMOVE UNFAVORABLY FOCUSED ELECTRONS AND TO RECOVER ENERGY FROM SAID ELECTRONS, AND MEANS FOR MAINTAINING SAID COLLECTOR ELECTRODE AT A POTENTIAL SUBSTANTIALLY EQUAL TO THAT OF SAID CATHODE, WHEREBY THE GAIN AND EFFICIENCY OF SAID ELECTRON DISCHARGE DEVICE IS INCREASED.