Title :
Design of electron guns and focusing structures for THz linear beam tubes
Author :
Read, Michael E. ; Kory, Carol ; Booske, John ; Ives, R.Lawrence
Author_Institution :
Calabazas Creek Res., Inc., San Mateo, CA
Abstract :
Results are reported for numerical modeling of concepts for non-circular beam formation for near-THz frequency TWTpsilas. Several methods for beam compression were examined, and one method appears promising for producing a 12 kV, 8 mA beam with a cross section 70 times 160 microns, while keeping the cathode loading to about 59 A/cm2. This would be suitable for a 650 GHz TWT. The beam loading is significantly lower than in similar frequency backward wave oscillators (BWO) and should result in much longer cathode lifetimes.
Keywords :
backward wave oscillators; electron guns; submillimetre wave tubes; travelling wave tubes; THz linear beam tubes; backward wave oscillators; beam compression; current 8 mA; electron guns; frequency 650 GHz; noncircular beam formation; numerical modeling; traveling wave tube; voltage 12 kV; Anodes; Cathodes; Current density; Diodes; Electrodes; Electron guns; Electron tubes; Magnetic circuits; Magnetic fields; Radio frequency; Electron beam; THz; TWT;
Conference_Titel :
Vacuum Electronics Conference, 2008. IVEC 2008. IEEE International
Conference_Location :
Monterey, CA
Print_ISBN :
978-1-4244-1715-5
DOI :
10.1109/IVELEC.2008.4556330
