Development of a Magnetic Cusp Gun for a 1-THz Harmonic Gyrotron

Li, Fan‐Hong; Du, Chao‐Hai; Zhang, Zi‐Wen; Li, Siqi; Gao, Zi‐Chao; Zhu, Juan‐Feng; Ma, Guowu; Huang, Qili; Ma, Hongwei; Zhang, Liang; Cross, Adrian W.; Liu, Pu-Kun

doi:10.1109/ted.2021.3120699

Cited by 6 publications

(6 citation statements)

References 36 publications

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“…For the generation of a beam with small spreads 𝛿𝛿𝛿𝛿 of the pitch factor 𝛿𝛿 = 𝑣𝑣 ⊥ /𝑣𝑣 ∥ , a constant canonical angular momentum over the emitter surface is required [5]. It is assumed that an emitted electron has no azimuthal velocity (𝜃𝜃 ̇= 0), which is valid if the 𝜃𝜃 component of the static electric field is zero.…”

Section: Methodsmentioning

confidence: 99%

“…1, a diagram of a typical helical gyro-TWT is shown. This type of gyro-TWT requires a socalled CUSP-type electron gun [4][5][6][7], in which an axisencircling large-orbit electron beam (LOB) is generated by a non-adiabatic reversal of the magnetic field (cusped magnetic field). Then the LOB is compressed and guided by a static magnetic field towards the HCIR.…”

Section: Introductionmentioning

confidence: 99%

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Development of a CUSP-Type Electron Gun for a W-Band Helical Gyro-TWT

Vöhringer¹,

Marek²,

Illy³

et al. 2022

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)

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To drive a broadband gyro-TWT with a helically corrugated interaction region, a high-quality axis-encircling electron beam is required. In this publication, a CUSP-type electron gun, capable of generating such a beam, is developed for a 94 GHz helical gyro-TWT. The design was optimized using the electron-beam-optics code ESRAY [1]. The final electron gun is optimized for the generation of an electron beam with a 50 kV beam voltage, 1.5 A current, and a pitch factor of 𝜶𝜶 = 𝟏𝟏. 𝟎𝟎 with an RMS spread as low as 3.49 %. Additionally, tolerance studies, including the influence of deviations in the emitter position and the surface roughness of the emitter, are performed.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a CUSP-Type Electron Gun for a W-Band Helical Gyro-TWT

Vöhringer¹,

Marek²,

Illy³

et al. 2022

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)

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“…The electron gun can operate in a wide range by tuning the auxiliary coil. In [21] only the results in 8.0-10.0 T were presented, however the electron gun can generate desired electron beams in 7.0-10.5 T. The parameters of the electron beams generated by the MCG at 10.3 T are detailed in Tab. II.…”

Section: Design and Modeling Of The Gyrotron A Geometry Structure And...mentioning

confidence: 99%

“…It should be noted that instead of sharing the same beam parameters for the six modes, each mode adopts the beam parameters corresponding to its own operating magnetic field [33]. The beam parameters at various magnetic field strengths are extracted from the electron gun simulations, which are partly presented in [21]. When turning the inner wall of cylindrical waveguides, the abrasion wear of cutting tools tends to influence the longitudinal uniformity of the waveguide.…”

Section: E Nonuniformity Of the Interaction Circuitmentioning

confidence: 99%

“…A LOG which can operate at the 5 th harmonic with a permanent magnet was constructed and experimentally investigated at FU, Japan [20].In this paper, a cusp electron gun generating LOBs was employed for the design and development of the 1-THz 4 th harmonic gyrotron. The design process and the optimized parameters of the electron gun are detailed in [21].…”

Section: Introductionmentioning

confidence: 99%

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Design of a 1-THz Fourth-Harmonic Gyrotron Driven by Axis-Encircling Electron Beam

Zhang

et al. 2022

IEEE Trans. Electron Devices

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In this paper, the design of a 4 th -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 1 st harmonic to 4 th harmonic in multiple discrete bands by varying the operating voltage. 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 2 nd harmonic, TE3,5 and TE3,6 for 3 rd harmonic, and TE4,8 for 4 th harmonic interactions. As the main operating mode, the TE4,8 can generate a peak output power of 1.68 kW, with an efficiency of about 2.1%, and a magnetically controlled frequency tuning range of about 1.8 GHz around 1 THz. The impact of the longitudinal nonuniformity of the cavity at high-harmonic interaction was also studied. It shows a radial tolerance of several micrometers will significantly elevate the start-oscillation current and deteriorate output performance. This design is towards the development of a synthesizing THz source with ultra-wideband tuning capability ranging from the sub-millimeter-wave to 1-THz bands.Index Terms-high harmonic terahertz gyrotron, multi-mode switching, broad-range magnetic tuning.

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