Title :
Carbon nanotube based cathodes for microwave amplifiers
Author :
Legagneux, P. ; Sech, N. Le ; Guiset, P. ; Gangloff, L. ; Cojocaru, C. ; Schnell, JP ; Pribat, D. ; Teo, K.B.K. ; Robertson, J. ; Milne, W.I. ; André, F. ; Rozier, Y. ; Dieumegard, D.
Author_Institution :
Thales Res. & Technol., Ecole Polytech., Palaiseau, France
Abstract :
We have studied two different kinds of electron tubes using a cold field emission cathode as the electron source. This cathode is an array of vertically aligned multiwall carbon nanotubes. The first device is a triode. With this device, we demonstrated the modulation at 32 GHZ of a 1.4 A/cm2 peak current density with a 82% modulation ratio. The second device is a traveling wave tube. For this device, the objective is to test a cathode delivering a 2 A/cm2 electron beam.
Keywords :
carbon nanotubes; electron tubes; microwave amplifiers; travelling wave tubes; carbon nanotube; cold field emission cathode; electron beam; electron source; electron tubes; frequency 32 GHz; microwave amplifiers; traveling wave tube; Carbon nanotubes; Cathodes; Current density; Electron beams; Electron tubes; Frequency; Microwave amplifiers; Microwave devices; Optical modulation; Solid state circuits; carbon nanotubes; cold cathode; field emission; microwave amplifier;
Conference_Titel :
Vacuum Electronics Conference, 2009. IVEC '09. IEEE International
Conference_Location :
Rome
Print_ISBN :
978-1-4244-3500-5
Electronic_ISBN :
978-1-4244-3501-2
DOI :
10.1109/IVELEC.2009.5193378
