Study of a 0.35 THz extended interaction oscillator driven by a pseudospark-sourced sheet electron beam

Xie, Jie and Zhang, Liang and Yin, Huabi and He, Wenlong and Ronald, Kevin and Phelps, A. D. R. and Chen, Xiaodong and Zhang, Jin and Alfadhl, Yasir and Yuan, Xuesong and Meng, Lin and Cross, Adrian W. (2019) Study of a 0.35 THz extended interaction oscillator driven by a pseudospark-sourced sheet electron beam. IEEE Transactions on Electron Devices. pp. 1-7. ISSN 0018-9383 (In Press)

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    Abstract

    A compact high power extended interaction oscillator (EIO) driven by a pseudospark-sourced (PSsourced) sheet electron beam is presented at 0.35 THz. It combines the advantages of a planar interaction circuit and a sheet electron beam generated from the PS discharge, including a large beam cross section, high gain per unit length, high current density with the additional benefit of not requiring an external focusing magnetic field. Staying within what is achievable with microfabrication techniques, the influence of tolerance on the Q-value, resonance frequency, and characteristic impedance was investigated. The effect of surface roughness caused by the manufacturing method on Ohmic loss of the material surface was studied. The advanced microfabrication techniques of UV-LIGA and Nano-CNC which are capable of realizing high precision and a metal surface of sufficient smoothness, were proposed to manufacture the planar structures. The effect of plasma density in PS-sourced sheet electron beam on the resonance frequency of the EIO circuit was investigated. The simulation results showed that the output signal had a slight frequency upshift and a decrease of the output power as the plasma desnisty increased at 0.35 THz, which is consistent with the theoretical analysis. Beam–wave interaction simulations for this planar EIO predicted a peak output power of 1.8 kW at ~0.35 THz using an effective value of conductivity of 1.1 x 107 S/m to take into account the skin depth and surface roughness.