3.5: Sheet beam EIK sensitivity to multimoding and circuit imperfections

Pasour, John; Nguyen, Khanh; Wright, E. L.; Levush, B.

doi:10.1109/ivelec.2010.5503612

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…However such structure supports many closely spaced longitudinal modes(2π 1/4π 2/4π 3/4π π) [3] , and an increasing number of gap shrinks the mode frequency spacing. The final option is a five gap cavity with an average R/Q of 91 ohms and a gap length of 0.28mm.…”

Section: Mode Competition Analysismentioning

confidence: 99%

Analysis of mode competition in output cavity for W-band sheet beam EIK

Chang

Meng

Yin

et al. 2015

2015 IEEE International Vacuum Electronics Conference (IVEC)

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Highly overmoded structures of sheet beam EIK are barriers for the stable operation in RF circuit. In this paper, 3D simulations of an output cavity are presented followed by the calculations of RF parameters and mode competition analysis. Simulation results indicate that potential mode competition is feasible to be alleviated by systematic optimization while meeting the other performance requirements simultaneously.

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Section: Mode Competition Analysismentioning

confidence: 99%

Analysis of mode competition in output cavity for W-band sheet beam EIK

Chang

Meng

Yin

et al. 2015

2015 IEEE International Vacuum Electronics Conference (IVEC)

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“…1, which ICEPIC simulations have shown to be quite effective at reducing coupling between the cavities due to misalignment or fabrication errors. [4] However, even with these chokes, only very small misalignments (on the order of 25 m) can be tolerated due to excitation of unwanted modes in the individual cavities. The sensitivity to these misalignments is also significantly greater in the higher gain 3-cavity circuit than in the 2-cavity version we initially studied.…”

Section: Baseline Performancementioning

confidence: 99%

“…The sensitivity to these misalignments is also significantly greater in the higher gain 3-cavity circuit than in the 2-cavity version we initially studied. [1,4] A key goal of the development effort is to demonstrate that these potential problems can be overcome in a high-gain, high-power circuit. The simulations indicate this is possible with tightly controlled tolerances.…”

Section: Baseline Performancementioning

confidence: 99%

Fabrication of a W-band sheet beam extended interaction klystron (EIK)

et al. 2012

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A W-band sheet-beam extended interaction klystron (EIK) is being fabricated and integrated with our previously demonstrated 19.5-kV, 3.3-A beamstick. The EIK is predicted by 3-D particle-in-cell simulations to have a saturated output power of almost 10 kW and a smallsignal gain >40 dB. Key design features of the device will be reviewed, and the status of the fabrication and testing will be discussed.

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“…Especially, diocotron-type instabilities that cause twisting and filamentation of a sheet beam transported in a uniform magnetic field are prevented. Moreover, in the sheet beam EIK, chokes are necessary for cutting off the coupling between the cavities which would result in oscillation [9]. In a multiplebeam EIK, the cutoff tunnel would eliminate the coupling between the cavities.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of a Planar Multiple-Beam Circuit for <inline-formula> <tex-math notation="LaTeX">$W$ </tex-math></inline-formula>-Band High-Power Extended-Interaction Klystron

Lü

Zhang

Wang

et al. 2015

IEEE Trans. Electron Devices

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Circuit analysis of a multiple-beam version of a high-power extended-interaction klystron is performed. The circuit is based on the barbell cavity with five coplanar electron beams across the transverse section of the cavity. Although the basic circuit design is straightforward, stable operation is challenging due to the mode competition and the self-oscillation in an oversized multiple-gap cavity driven by multiple beam sources. The 3-D particle-in-cell (PIC) simulation technology and the space-charge wave theory were exploited to analyze the stability. The physical design of the interaction system was accomplished with the beam parameters of voltage 19 kV and of overall current 4 A (0.8 A × 5). PIC results show that a power of 11.28 kW can be achieved at a frequency of 94.48 GHz with an instantaneous 3-dB bandwidth of 160 MHz. The corresponding gain and electric efficiency are 55.75 dB and 14.84%, respectively. IndexTerms-Barbell cavity, extended-interaction klystron (EIK), mode competition, particle-in-cell (PIC) simulation, planar multiple beams.

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3.5: Sheet beam EIK sensitivity to multimoding and circuit imperfections

Cited by 9 publications

References 5 publications

Analysis of mode competition in output cavity for W-band sheet beam EIK

Analysis of mode competition in output cavity for W-band sheet beam EIK

Fabrication of a W-band sheet beam extended interaction klystron (EIK)

Stability Analysis of a Planar Multiple-Beam Circuit for <inline-formula> <tex-math notation="LaTeX">$W$ </tex-math></inline-formula>-Band High-Power Extended-Interaction Klystron

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