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Abstract
In this article, the design of a fourth-harmonic gyrotron with 1-kW-level output power at 1 terahertz (THz) is presented. A unique advantage of this design is that, with a well-optimized magnetic-cusp large-orbit electron gun, the designed gyrotron can operate from first-harmonic to fourth-harmonic in multiple discrete bands by varying the confining magnetic field strength. By carefully balancing the competing modes, the gyrotron can be tuned to operate at six candidate modes, including TE1,2 for fundamental harmonic, TE2,3 and TE2,4 for second-harmonic, TE3,5 and TE3,6 for third-harmonic, and TE4,8 for fourth-harmonic interactions. As the main operating mode, the TE4,8 can generate a peak output power of 1.68 kW, with an output efficiency of about 2.1%, and a magnetically controlled frequency tuning range of about 1.5 GHz around 1 THz. The impact of the longitudinal nonuniformity of the cavity at high-harmonic interaction was also studied. It shows that a radial tolerance of several micrometers will significantly elevate the start-oscillation current and deteriorate output performance. This design is to produce a THz source with ultra-wideband tuning capability ranging from the submillimeter-wave to 1-THz bands.
Original language | English |
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Pages (from-to) | 3393-3399 |
Number of pages | 7 |
Journal | IEEE Transactions on Electron Devices |
Volume | 69 |
Issue number | 6 |
Early online date | 3 May 2022 |
DOIs | |
Publication status | Published - 30 Jun 2022 |
Keywords
- broad-range magnetic tuning
- high-harmonic terahertz (THz) gyrotron
- multimode switching
- gyrotrons
- harmonic analysis
- surface roughness
- surface impedance
- superconducting materials
- rough surfaces
- tuning
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Dive into the research topics of 'Design of a 1-THz fourth-harmonic gyrotron driven by axis-encircling electron beam'. Together they form a unique fingerprint.Projects
- 1 Finished
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Terahertz High-Harmonic Gyrotron Oscillator By Using Metasurface Cylindrical Cavity (Newton Advanced Fellowship - Prof Chao-Hai Du)
Cross, A. (Principal Investigator) & Zhang, L. (Research Co-investigator)
28/03/18 → 27/09/22
Project: Research Fellowship