Design of low voltage folded waveguide multiple beam mini-TWTs

Design methodology for low voltage high power multiple beam Traveling Wave Tube (TWT) amplifiers with folded waveguide (FW) slow wave structure (SW) has been developed. Four beam multiple beam (MB) FW TWT operating at 6.2 kV with power per beamlet about 75 W and total power of 300 W has been designed and studied by using NRL large signal codes TESLA-FW and CHRISTINE-FW and NRL GPU based PIC code Neptune. Recent status of experimental demonstration of MB mini TWT in NRL also will be presented.