An Improved Small-Signal Theory of the Triaxial Klystron Amplifier in the Dispersion Relation and Beam Coupling Coefficient

Qi, Zumin; Zhang, Jun; Zhong, Huihuang; Zhang, Zhehai; Bai, Xianchen; Zhang, Dian; Bai, Zhen

doi:10.1109/tps.2011.2172639

Cited by 12 publications

(3 citation statements)

References 16 publications

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“…9. A radial input cavity 16 with a coaxial line feed-in is chosen to keep the electric field azimuthally symmetrical. According to the basic design principle, 7,8 the radius of the cavity must be an odd number of quarter-wavelength k, and the value can be chosen to adjust the ratio of energy stored to gap voltage.…”

Section: Application and Further Verificationsmentioning

confidence: 99%

A non-uniform three-gap buncher cavity with suppression of transverse-electromagnetic mode leakage in the triaxial klystron amplifier

2014

Physics of Plasmas

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The triaxial klystron amplifier is an efficient high power relativistic klystron amplifier operating at high frequencies due to its coaxial structure with large radius. However, the coaxial structures result in coupling problems among the cavities as the TEM mode is not cut-off in the coaxial tube. Therefore, the suppression of the TEM mode leakage, especially the leakage from the buncher cavity to the input cavity, is crucial in the design of a triaxial klystron amplifier. In this paper, a non-uniform three-gap buncher cavity is proposed to suppress the TEM mode leakage. The cold cavity analysis shows that the non-uniform three-gap buncher cavity can significantly suppress the TEM mode generation compared to a uniform three-gap buncher cavity. Particle-in-cell simulation shows that the power leakage to the input cavity is less than 1.5% of the negative power in the buncher cavity and the buncher cavity can efficiently modulate an intense relativistic electron beam free of self-oscillations. A fundamental current modulation depth of 117% is achieved by employing the proposed non-uniform buncher cavity into an X-band triaxial amplifier, which results in the high efficiency generation of high power microwave. V C 2014 AIP Publishing LLC.

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Section: Application and Further Verificationsmentioning

confidence: 99%

A non-uniform three-gap buncher cavity with suppression of transverse-electromagnetic mode leakage in the triaxial klystron amplifier

2014

Physics of Plasmas

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“…2,3 In recent years, researchers have made great efforts to address these issues. Apart from increasing the structure size or utilizing the coaxial structure to enhance the power handling capacity of a single HPM source, [4][5][6][7][8][9] researchers have investigated power combination of multiple HPM sources. The power combination can be either the spatial coherent combination of an array of phase-locked sources [10][11][12][13][14][15] or the waveguide-based power summation of multiple sources.…”

Section: Introductionmentioning

confidence: 99%

Power combination of two phase-locked high power microwave beams from a new coaxial microwave source based on dual beams

Li,

Zhang,

Zhang

et al. 2014

Physics of Plasmas

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The new coaxial high power microwave source based on dual beams has demonstrated two phaselocked output microwave beams generated by its two sub-sources. In order to achieve a single higher output power, we present a three-port waveguide-based power combiner to combine the two microwave beams. Particle-in-cell simulation results show that when the diode voltage is 675 kV and the guiding magnetic field is 0.8 T, a combined microwave with an average power of about 4.0 GW and a frequency of 9.74 GHz is generated; the corresponding power conversion efficiency is 29%. The combination effect of the combiner is further validated in the diode voltage range from 675 kV to 755 kV as well as in the pulse regime. The simulations indicate that the maximum surface axial electric field strength of the electrodynamic structure is 720 kV/cm, which is relatively low corresponding to an output power of 4.0 GW. The stable combined output suggests the probability of long-pulse operation for the combined source. V C 2014 AIP Publishing LLC.

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“…The spatial power combining is a feasible approach that the frequency and phase difference among the microwave sources should be the same. We have developed an improved small-signal theory on beamcavity interaction based on the transmission line model of space charge waves and the theory of Krall and coworkers (Qi et al, 2012). However, scaling the RKAs to higher frequencies (such as X-band) results in lower power and efficiency.…”

Section: Introductionmentioning

confidence: 99%

A large-signal theory of bunching in the triaxial klystron amplifier

Zhang

Zhong

et al. 2012

Laser Part. Beams

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A large-signal theory of bunching of an intense relativistic electron beam with both velocity and density modulation in the triaxial klystron has been derived in this paper. The theory presents both the harmonic current and the transient velocity in the bunching process, and expresses the velocity modulation directly by the modulation voltage that is easier to be attained and controlled in practice. A few checks are performed on the large-signal theory by particle-in-cell simulation that suggested the large-signal theory of bunching can successfully predict the first-order harmonic current and the velocity on a beam, with both velocity and density modulation, after interacting with a modulation voltage on the order of magnitude with the beam voltage. The theory described in this paper can accommodate general situations such as the bunching of a modulated beam after interacting with a buncher cavity of the Triaxial klystron amplifier.

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An Improved Small-Signal Theory of the Triaxial Klystron Amplifier in the Dispersion Relation and Beam Coupling Coefficient

Cited by 12 publications

References 16 publications

A non-uniform three-gap buncher cavity with suppression of transverse-electromagnetic mode leakage in the triaxial klystron amplifier

A non-uniform three-gap buncher cavity with suppression of transverse-electromagnetic mode leakage in the triaxial klystron amplifier

Power combination of two phase-locked high power microwave beams from a new coaxial microwave source based on dual beams

A large-signal theory of bunching in the triaxial klystron amplifier

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