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Kuftin, A. N.; Lygin, V. K.; Мануилов, В. Н.; Postnikova, A. S.; Zapevalov, V. E.

doi:10.1023/a:1021757213511

Cited by 46 publications

(36 citation statements)

References 4 publications

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“…In terms of efficiency, the exact and approximate dependences η(P ohm ) differ by only 0.05 for both the idealized model without the electron-velocity spread (δv ⊥ = 0) and the model with the relative velocity spread δv ⊥ = 0.4. In the electron beam of an actual gyrotron, one can expect the velocity spread δv ⊥ ≈ 0.3 [22]. The obtained results are indicative of the possibility to calculate and optimize gyrotrons in the approximation of a given field structure.…”

Section: Results Of Calculations For the Stationary Regimementioning

confidence: 57%

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Numerical simulation of dynamic processes in gyrotrons with low-Q cavities

Zavolsky

Zapevalov

Moiseev

2006

Radiophys Quantum Electron

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We study theoretically models of gyrotrons having fixed and self-consistent axial structures of the high-frequency field in the cavity with an actual profile. The limits of applicability of the model with a given field structure are determined during the study of competition of the operating and parasitic modes. It is shown that for the regimes which are optimal in terms of efficiency, the influence of the nonfixed nature of the high-frequency field structure on the starting current, the stability of stationary generation of the operating mode, the efficiency, the output power, and the thermal ohmic load of the cavity is insignificant. As the beam current and the mismatch between the cutoff frequencies of the operating and parasitic modes increase, significant qualitative differences between the models with given and self-consistent axial structures of the high-frequency field are observed.

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Section: Results Of Calculations For the Stationary Regimementioning

confidence: 57%

“…The initial spread δv ⊥ = 0.3 of electron velocities at the cavity input, which is typical of gyrotrons [18,19,22], has almost no influence on the operating mode and the close parasitic modes (|δω cut | < 4%) with q = 1. For |δω cut | > 4%, the boundaries of stability in Fig.…”

Section: Influence Of the Spread Of Initial Electron Velocitiesmentioning

confidence: 99%

Numerical simulation of dynamic processes in gyrotrons with low-Q cavities

Zavolsky

Zapevalov

Moiseev

2006

Radiophys Quantum Electron

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“…The experience of developing MIGs for various frequency ranges [13] demonstrates that it is preferable to use the parameter t j = I 0 /I L ≤ 0.2. The value of t j is determined by the value of the "cold" electric field E c0 (without the electron beam) at the cathode.…”

Section: Features Of Migs Of High-power Pulsed Submillimeter-wave Gyrmentioning

confidence: 99%

“…The value of t j is determined by the value of the "cold" electric field E c0 (without the electron beam) at the cathode. Usually, MIGs work at E c0 = 4-6 kV/mm [13]. Greater values of E c can initiate a breakdown, whereas smaller ones lead to great values of t j , a too strong influence of the space-charge field on the pitch factor, and a significant increase in the spread δv ⊥ of transverse electron velocities [13].…”

Section: Features Of Migs Of High-power Pulsed Submillimeter-wave Gyrmentioning

confidence: 99%

“…Usually, MIGs work at E c0 = 4-6 kV/mm [13]. Greater values of E c can initiate a breakdown, whereas smaller ones lead to great values of t j , a too strong influence of the space-charge field on the pitch factor, and a significant increase in the spread δv ⊥ of transverse electron velocities [13]. For a fixed value of R c , the above-mentioned limitations for E c0 lead to a limitation for the minimum value of the average beam radius R 0 in the working space of a gyrotron.…”

Section: Features Of Migs Of High-power Pulsed Submillimeter-wave Gyrmentioning

confidence: 99%

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Nonparaxial magnetron injection gun for a high-power pulsed submillimeter-wave gyrotron

Glyavin

Лучинин

Мануилов

2009

Radiophys Quantum El

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We determine distinctive features of the systems forming helical electron beams (HEBs) for high-power pulsed gyrotrons operated in the submillimeter-wave range. It is shown that they are characterized by a nonparaxial magnetic field in the emitter region, short distances between the cathode and the cavity, and the necessity of supplementing the magnetic system with a cathode coil placed behind the emitter. In a diode-type magnetron injection gun, which forms a boundary beam with a power of up to 4 MW, one can obtain the HEB parameters which are acceptable for the gyrotron operation.

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