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Idehara, T.; Nojima, Hitoshi; Pereyaslavets, M.; Yoshida, Kazufumi; Ogawa, I.; Tatsukawa, Toshiaki

doi:10.1023/a:1022611520012

Cited by 25 publications

(7 citation statements)

References 4 publications

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“…Another factor, which can result in a decrease in the output power, is inaccuracy of adjustment of the gyrotron in the cryomagnet, which leads to displacement of the axis of the electron beam with respect to the cavity axis [11]. Figure 2 shows calculated efficiencies as functions of the distance between the cavity axis and the electron beam axis for two values of the pitch factor, namely, g = 1 and 1.2.…”

Section: Influence Of Inaccuracies Of Cavity Manufacture and Electronmentioning

confidence: 99%

Specific features of the development of a high-stability continuous-wave gyrotron operated at the second harmonicwith a working frequency OF 258 GHz

Zapevalov

Zavolskiy

Malygin

et al. 2009

Radiophys Quantum El

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We consider specific features of the development of a continuous-wave 258 GHz gyrotron operated at the second gyrofrequency harmonic, which are related to ensuring of high stability of its output parameters. The requirements to accuracy of manufacture of the cavity and adjustment of the electron beam are evaluated, as well as the necessary parameters of the power sources of the gyrotron complex, which should maintain the required level and stability of the generated power and frequency. The influence of the effect of spurious-mode reflection from the output window of the gyrotron is studied.

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Section: Influence Of Inaccuracies Of Cavity Manufacture and Electronmentioning

confidence: 99%

Specific features of the development of a high-stability continuous-wave gyrotron operated at the second harmonicwith a working frequency OF 258 GHz

Zapevalov

Zavolskiy

Malygin

et al. 2009

Radiophys Quantum El

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“…This means, in particular that the operating mode is the superposition of the TE −2 3 and TE 2 3 modes which have opposite rotation directions. Here, the question which remains open is that whether the standing wave is generated directly in the cavity, e.g., due to axial misalignment of the electron beam and the cavity [11] and (or) it results from a violation of the axial symmetry of the cavity [5,12,13]. On the other hand, one cannot exclude the fact that the mode with the opposite rotation direction can be generated in the after-cavity interval due to re-radiation of the fundamental mode.…”

Section: Field Structure Of the Output Radiationmentioning

confidence: 99%

Experimental study of a continuous-wave high-stability second-harmonic gyrotron for spectroscopy of dynamically polarized nuclei

Venediktov

Dubrov

Zapevalov

et al. 2010

Radiophys Quantum El

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We present the results of the experiments on a continuous-wave gyrotron with an output frequency of about 260 GHz, which has been developed for dynamic polarization of nuclei and is operated at the second cyclotron-frequency harmonic. For an accelerating voltage of 16 kV and a beam current of 0.3 A, a maximum continuous-wave radiation power of about 200 W has been obtained. Measurements of the thermal load on the resonator cavity allow evaluating its actual ohmic Qfactor. Gyrotron radiation is also observed at other frequencies and modes. Their generation zones and the structure of the output radiation have been studied. Long-term stability of gyrotron parameters has been determined.

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“…It is intuitively clear that the role of such misalignments increases with the wavelength shortening. Therefore, in view of numerous recent experiments with sub-THz gyrotrons, [15][16][17] it makes sense to analyze this problem in more detail. In the present paper, the effect of the beam tilt on the efficiency of the conventional gyrotron close to cylindrical symmetry interaction space is analyzed.…”

Section: Introductionmentioning

confidence: 99%

Effect of electron beam misalignments on the gyrotron efficiency

Dumbrājs

Nusinovich

2013

Physics of Plasmas

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The theory describing the operation of gyrotrons with tilted and shifted electron beams has been developed. Effects of the tilt and shift are studied for a 1 MW, 170 GHz gyrotron, which is presently under development in Europe for electron cyclotron resonance plasma heating and current drive in the International Thermonuclear Experimental Reactor. It is shown that one should expect significant deterioration of gyrotron operation in such gyrotrons when the tilt angle exceeds 0.4-0.5 and the parallel shift of the beam axis with respect to the axis of a microwave circuit is larger than 0.4-0.5 mm. At the same time, simultaneous tilting and shifting in a proper manner can mitigate this deteriorating effect. V

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Cited by 25 publications

References 4 publications

Specific features of the development of a high-stability continuous-wave gyrotron operated at the second harmonicwith a working frequency OF 258 GHz

Specific features of the development of a high-stability continuous-wave gyrotron operated at the second harmonicwith a working frequency OF 258 GHz

Experimental study of a continuous-wave high-stability second-harmonic gyrotron for spectroscopy of dynamically polarized nuclei

Effect of electron beam misalignments on the gyrotron efficiency

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