Abstract
A circuit design of sheet-beam extended interaction oscillator (SB-EIO) with an overmoded staggered grating array is embodied in theoretical analyses which combined with particle-in-cell (PIC) simulation. Mode and dispersion analyses on the design of the TM41-2π mode EIO demonstrated that the optimized cutoff frequency and the dimensions of the SWS noticeably suppress non-operating lower order modes. The overmoded structure only allowed the desired 4th order mode to propagate in the structure. In addition, this structure benefit from a mm-level transverse size structure, so that it can be a potential solution for the applications (such as communications and spectroscopy) lack in output power. The newly designed EIO is simulated with copper used as the background material, and the ∼0.375 THz radiation power of ∼105W is achieved when an electron beam with 1.3 A and 44.5 kV is injected. The designed circuit structure can be widely applied to sheet beam devices for THz RF generation.
Highlights
Millimeter extended interaction klystrons (EIKs) and EIOs are attractive for many applications because of the requirement in the fields of plasma diagnosis, material science, spectroscopy, commerce, and military applications such as communications, radars, transmitters, atmospheric sensing, and near object analysis.1–3 Conventional EIKs and EIOs generally adopt ladder-like model with a rectangular beam tunnel, and the ladder is a kind of multi-gap coupling structure
A circuit design of sheet-beam extended interaction oscillator (SB-EIO) with an overmoded staggered grating array is embodied in theoretical analyses which combined with particle-in-cell (PIC) simulation
The output power of sheet-beam oscillators operating at the TM11 mode will be limited due to the limitation of the cathode emission current density and the dimension of the drift head
Summary
Millimeter extended interaction klystrons (EIKs) and EIOs are attractive for many applications because of the requirement in the fields of plasma diagnosis, material science, spectroscopy, commerce, and military applications such as communications, radars, transmitters, atmospheric sensing, and near object analysis. Conventional EIKs and EIOs generally adopt ladder-like model with a rectangular beam tunnel, and the ladder is a kind of multi-gap coupling structure. Conventional EIKs and EIOs generally adopt ladder-like model with a rectangular beam tunnel, and the ladder is a kind of multi-gap coupling structure It used to be operating at the fundamental TM11 mode.. Operating in transverse modes (TMn1 modes) can increase the size of cavity and the cross-section area of drift head, increasing the area of electron beam and cathode, reducing the operation current density of cathode, increasing the beam loading conductance (Ge). As a result, this can reduce the working voltage of tube and increase the power capacity. In order to verify the stability of the hot test results, two kinds of PIC simulation software are adopted: Computer Science Technology (CST) and CHPIC PIC code. Conclusions are covered in the Section IV
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