Investigation of terahertz sheet beam traveling wave tube amplifier with nanocomposite cathode

Shin, Young-Min; Zhao, Jinfeng; Barnett, Larry R.; Luhmann, Neville C.
December 2010
Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p123105
Academic Journal
Particle-in-cell simulations of a staggered double grating array traveling wave tube intended as a wideband amplifier for terahertz communications, sensing, and imaging applications showed that, for an electron beam power of 5 kW, it produces 150-275 W, corresponding to 3%-5.5% electronic efficiency, at 0.22 THz with over ∼30% bandwidth and with greater than 12 dB/cm growth rate. The circuit has been fabricated by both UV lithography and high precision computer-numerical-control machining with ∼2-3 μm dimensional tolerance and ∼50 nm surface roughness. A scandate nanocomposite (Sc2O3-W) cathode for the electron beam source has successfully emitted 120 A/cm2 (space charge limited) at 1150 °C and 50 A/cm2 at 1050 °C for 8000 h as required to produce the requisite high current density electron beam.


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