Influence of the energy and velocity spread in the electron beam on the starting conditions and efficiency of a gyrotron

Zavolsky, N. A.; Zapevalov, V. E.; Moiseev, M. A.

doi:10.1007/s11141-006-0042-0

Cited by 25 publications

(12 citation statements)

References 12 publications

(30 reference statements)

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“…The achievable value of the gyrotron efficiency significantly depends on the electron-beam quality [13], the velocity spread (δv ⊥ ) and energy spread (δγ) of electrons at the cavity input. According to studies of self-consistent models of megawatt-power gyrotrons [14], the influence of δv ⊥ and δγ on the gyrotron efficiency can be approximated by the formula…”

Section: Processes In the Gyrotron Cavity And Heb Formation Systemmentioning

confidence: 99%

The gyrotron: Constraints on output-power and efficiency increase

Zapevalov

2006

Radiophys Quantum Electron

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UDC 621.385With allowance for the results of national and foreign gyrotron developments, we analyze constraints on the gyrotron efficiency and output power stipulated by the properties of the electron beam, the processes in a resonant cavity, the output-window throughput, the scattered-radiation losses in a built-in converter, and the energy release on a collector. A comparative estimate of the influence of the factors limiting the gyrotron power and efficiency is given.

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Section: Processes In the Gyrotron Cavity And Heb Formation Systemmentioning

confidence: 99%

The gyrotron: Constraints on output-power and efficiency increase

Zapevalov

2006

Radiophys Quantum Electron

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“…6,7 Generally, the interaction of an electron beam with a wave ͑a certain waveguide mode͒ takes place in the region of a cavity where the oscillation frequency is close to the cutoff frequency of the waveguide. In the region after the cavity, the wave becomes a traveling wave and the interaction stops.…”

Section: Introductionmentioning

confidence: 99%

Experimental observation of the effect of aftercavity interaction in a depressed collector gyrotron oscillator

et al. 2007

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This paper presents the experimental observation of the effect of an aftercavity interaction ͑ACI͒ in a depressed collector gyrotron oscillator. The gyrotron generates an output power of 1.5 MW at 110 GHz in 3 s pulses with a 96 kV and 40 A electron beam and has a single-stage depressed collector. The ACI arises from an unintended cyclotron resonant interaction between the microwave beam traveling out from the cavity and the gyrating electron beam. The interaction occurs in the uptaper of the launcher, immediately downstream from the cavity, where the magnetic field is slightly lower than its value in the cavity region. The ACI results in a reduction in efficiency since the electron beam tends to extract power from the wave. There is also a broadening of the spent beam energy profile, which reduces the effectiveness of the depressed collector and in turn limits the overall efficiency of a gyrotron. Measurements of the maximum depression voltage of the collector vs beam current at 96 kV are compared with simulations from the MAGY code ͓M. Botton et al., IEEE Trans. Plasma Sci. 26, 882 ͑1998͔͒. Excellent agreement is obtained between theory and experiment but only if the ACI is included. In the present experiment, it is estimated that the observed efficiency of 50% would have been about 60% in the absence of the ACI. These results verify the role of the ACI in reducing the efficiency of the gyrotron interaction.

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“…Note that specific features of the magnetic system and of the frequency range lead to a long distance between the cavity and the cathode and, correspondingly, an increased length of the electron transport channel compared with millimeter-wave gyrotrons [3]. In this case, the danger of electron-beam instability development in the transport channel [6] and of occurrence of energy spread of electrons, which impairs the gyrotron efficiency [7], increases.…”

Section: Electron Gun and Collectormentioning

confidence: 99%

High-power oscillator of continuous electromagnetic radiation with a frequency of 300 GHz

Zapevalov

Lygin

Malygin

et al. 2007

Radiophys Quantum Electron

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We consider a general concept of construction, the possible versions, and specific features of a gyrotron, whose output power in CW oscillation regime can reach a few kilowatts at a frequency of 300 GHz. The gyrotron is designed for work in a high-frequency facility in combination with a "dry" cryomagnet, which ensures a magnetic field of up to 12 T, required for the gyrotron operation. The basic results of numerical simulation and optimization of the electron gun, the resonant cavity, and other subsystems of the gyrotron are presented. The designs used for the gyrotron development are justified. Preliminary experiments showed the efficiency of the pilotproduction gyrotron with an output power of about 2 kW, which is record-breaking in this frequency range.

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Influence of the energy and velocity spread in the electron beam on the starting conditions and efficiency of a gyrotron

Cited by 25 publications

References 12 publications

The gyrotron: Constraints on output-power and efficiency increase

The gyrotron: Constraints on output-power and efficiency increase

Experimental observation of the effect of aftercavity interaction in a depressed collector gyrotron oscillator

High-power oscillator of continuous electromagnetic radiation with a frequency of 300 GHz

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