Low-voltage gyrotrons

Glyavin, M. Yu.; Zavolskiy, N. A.; Sedov, A. S.; Nusinovich, Gregory S.

doi:10.1063/1.4791663

Cited by 37 publications

(11 citation statements)

References 21 publications

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“…Such power is approximately five times higher than in the worldwide reported gyrotrons at the same frequency range. It is important that power values up to 10W required for spectroscopy applications can be obtained at low voltage of about 1.5 kV or low beam current of 20 mA [26]- [28].…”

Section: Development Of Thz-band Gyrotronsmentioning

confidence: 99%

Russian Gyrotrons: Achievements and Trends

2021

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Section: Development Of Thz-band Gyrotronsmentioning

confidence: 99%

Russian Gyrotrons: Achievements and Trends

2021

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“…The electron velocity spread (the rms value of the relative transverse velocities spread is about 10%), and the ohmic losses (the ohmic Q-factor is equal to 10 460) were taken into account. The ohmic Q-factor was determined by (8) from [24] taking into account the change of the conductivity due to surface roughness: σ = σ th /k = 25 MS/m, where empirical roughness coefficient for considered frequency was taken as k = 2 [25], [26]. As follows from Fig.…”

Section: Numerical Investigation Of Cavity Profile Influence On Tmentioning

confidence: 99%

Analysis of the Possibilities to Control Diffraction Quality Factors of the Cavities of Subterahertz Gyrotrons

Zuev

Sedov

Semenov

et al. 2020

IEEE Trans. Plasma Sci.

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Manufacturing of cylindrical cavities for shortwavelength gyrotrons is usually performed with micrometerscale precision. In subterahertz (sub-THz) and terahertz (THz) gyrotrons, this often results in the fabrication of slightly up-tapered cavities instead of the cavities having the central parts of a constant radius. Correspondingly, the diffractive quality factors (Q D-factors) of such slightly conical cavities may differ from those calculated for the cavities with constant radius central parts. We show that the sensitivity of Q D-factors to the cavity fabrication can be mitigated by introducing some local nonuniformities at the end of a slightly conical up-tapered section of the cavities. The proposed approach is illustrated with an example of a gyrotron designed for spectroscopic applications and having an output radiation power of tens of watts at the frequency of 0.527 THz. This article presents some numerical modeling results, which show how proposed local nonuniformities reduce the sensitivity of Q D-factors to defects in fabrication.

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“…From the starting currents, one also can know that operating mode TE +7.3 can be oscillated preferentially at a reasonable region of magnetic field, and then to suppress other oscillations of competing modes. Meanwhile, the multimode competition has been analyzed by using a time‐dependent, multifrequency code based on the fixed‐field theory . In the simulation, the field profiles of simulated modes in the cavity are assumed to be fixed and approximated as cold cavity field profiles.…”

Section: The Hot‐cavity Analysismentioning

confidence: 99%

“…For the purpose of designing a 10‐kW‐level 94 GHz second harmonic gyrotron with high efficiency, in this article, we present simulation and analysis on the designed gyrotron. In order to achieve the low current or low voltage with high efficiency, a lot of publications have presented related studies . Here, a complex cavity with a throat between the output taper and the second cavity has been used in the design for achieving the startup of the main mode at low‐voltage and low‐current conditions.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis on a 0.1‐THz second harmonic low‐voltage, low‐current gyrotron with complex cavity

Zhang²,

Zhang

et al. 2020

Micro & Optical Tech Letters

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This article presents the design and analysis of a complex cavity that will be used in a 10 kW‐level 94 GHz second harmonic low‐current, low‐voltage gyrotron. The mode pair of TE+7.2/TE+7.3 is selected as the operating modes of the complex cavity. In cold‐cavity design, a throat is introduced in the complex cavity to increase the diffractive quality factor, which can make the gyrotron operate at low‐current and low‐voltage conditions. In hot‐cavity analysis, the beam‐wave interaction efficiency affected by different factors has been studied in detail. At the operating point with beam voltage of 32 kV and beam current of 1.5 A, the mode competition has been studied based on the analysis of starting current and a time‐dependent multifrequency code; the transverse velocity spread influence on the efficiency has also been investigated. The results indicate that the operating mode eventually dominates the mode selection, while the competing modes are all at noise level. Meanwhile, the interaction efficiency can keep more than 30% with maintaining the spread below 8%, and the output power can hold at 10 kW‐level when the spread is below 12%.

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Low-voltage gyrotrons

Cited by 37 publications

References 21 publications

Russian Gyrotrons: Achievements and Trends

Russian Gyrotrons: Achievements and Trends

Analysis of the Possibilities to Control Diffraction Quality Factors of the Cavities of Subterahertz Gyrotrons

Design and analysis on a 0.1‐THz second harmonic low‐voltage, low‐current gyrotron with complex cavity

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