Experimental verification of low-velocity spread axis-encircling electron beam

Jeon, Seok-Gy; Baik, Chan-Wook; Kim, D. H.; Park, G. S.; Sato, Nobuyuki; Yokoo, K.

doi:10.1063/1.1687454

Cited by 10 publications

(2 citation statements)

References 11 publications

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“…Axis-encircling electron beams are normally employed in high-harmonic gyrotrons because of the advantage of selectively suppressing mode competition [5]- [9]. According to previous studies, using a magnetic cusp gun (MCG) with an axis-symmetrical gradual magnetic reversal is more feasible than other schemes for generating axis-encircling electron beams [5]- [13]. Several factors, including flexible geometry, sensitive electric field, and high magnetic compression ratio, increase the difficulty of suppressing parameter spreads [12]- [13].…”

Section: Introductionmentioning

confidence: 99%

“…According to previous studies, using a magnetic cusp gun (MCG) with an axis-symmetrical gradual magnetic reversal is more feasible than other schemes for generating axis-encircling electron beams [5]- [13]. Several factors, including flexible geometry, sensitive electric field, and high magnetic compression ratio, increase the difficulty of suppressing parameter spreads [12]- [13]. This paper proposes a flow-feature compensation principle for building a zero-spread axis-encircling electron beam that is promising for developing high-power high-harmonic terahertz gyrotrons.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Conformal Cross-Flow Axis-Encircling Electron Beam for Driving THz Harmonic Gyrotron

Hao

et al. 2015

IEEE Electron Device Lett.

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In a magnetic cusp gun, the canonical-angularmomentum (CAM) spread of the initially emitted electrons is crucial in generating substantial beam velocity spread. A new method called electron beam flow-feature compensation is proposed to build an axis-encircling electron beam with zero velocity spread by optimizing the cross-flow trajectories to compensate for the initial CAM spread. This method provides an effective solution to the velocity-spread problem in terahertz gyrotrons and increases the emission current to a level that is several times higher than the level that can be obtained using current technology.Index Terms-axis-encircling electron beam, electron cyclotron maser, harmonic operation, terahertz radiation

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conformal Cross-Flow Axis-Encircling Electron Beam for Driving THz Harmonic Gyrotron

Hao

et al. 2015

IEEE Electron Device Lett.

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Relativistic performance analysis of a high current density magnetron injection gun

et al. 2009

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Electron beam quality is essential to the performance of millimeter-wave gyroamplifiers, particularly the gyrotron traveling-wave tube amplifier, which is extremely sensitive to the electron velocity spread and emission uniformity. As one moves up in power and frequency, the quality of the electron beam becomes even more critical. One aspect of the electron beam formation technology which has received relatively little attention has been the performance analysis of the electron beam itself. In this study, a 100 kV, 8 A magnetron injection gun with a calculated perpendicular-to-parallel velocity ratio of 1.4 and axial velocity spread of 3.5% has been designed, tested, and analyzed. It is shown that the equipment precision and a fully relativistic data analysis model afford sufficient resolution to allow a verification of the theoretical predictions as well as a quantitative inference to the surface roughness of the cathode used.

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A novel large-orbit electron beam generated by a Cuccia coupler for a Ka-band third-harmonic slotted peniotron

Zhao

Zhang

et al. 2010

Physics of Plasmas

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In this work, a novel large-orbit electron beam generated by a Cuccia coupler for a Ka-band third-harmonic slotted is proposed. The Cuccia coupler was originally used in the electron coupler for amplitude modulation and power control at ultrahigh frequencies. It is demonstrated by the 3D-PIC simulation that a 6 kV, 0.5 A beam will be gyroresonantly accelerated when a microwave power of 16 kW at 10 GHz is injected into the coupler, from which a 37 kV, 0.5 A large-orbit electron beam will be obtained; it is characterized by a relative velocity spread lower than 1% and a velocity ratio α (υ⊥/υz) up to 2.3. Moreover, other electron beam parameters including transverse velocity (υ⊥), longitudinal velocity (υz) and deviation of guiding center could be adjusted independently, whereas these are rather difficult for the cusp gun. Finally, the Ka-band third-harmonic slotted peniotron in 2π mode driven by such a beam is verified by 3D-PIC simulation, which is predicted to yield an output power of 8 kW at 30 GHz, with a microwave power conversion efficiency up to 50% and a device efficiency up to 43%, respectively.

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Experimental verification of low-velocity spread axis-encircling electron beam

Cited by 10 publications

References 11 publications

Conformal Cross-Flow Axis-Encircling Electron Beam for Driving THz Harmonic Gyrotron

Conformal Cross-Flow Axis-Encircling Electron Beam for Driving THz Harmonic Gyrotron

Relativistic performance analysis of a high current density magnetron injection gun

A novel large-orbit electron beam generated by a Cuccia coupler for a Ka-band third-harmonic slotted peniotron

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