The Analytical Design of a Folded Waveguide Traveling Wave Tube and Small Signal Gain Analysis Using Madey's Theorem

Malek, F.

doi:10.2528/pier09092604

Cited by 16 publications

(11 citation statements)

References 37 publications

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“…The waveguide problem arises in many different contexts in electromagnetics, see e.g., [8,14,23,32,38,41] for some recent studies. The model problems are extracted from the testbed collection described in [1]; it was proposed with the primary purpose of testing numerical algorithms for solving difficult non-Hermitian eigenvalue problems in real applications.…”

Section: Numerical Experimentsmentioning

confidence: 99%

A Novel Lanczos-Type Procedure for Computing Eigenelements of Maxwell and Helmholtz Problems

Carpentieri¹,

Jing

Huang

2010

PIER

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Abstract-We introduce a novel variant of the Lanczos method for computing a few eigenvalues of sparse and/or dense nonHermitian systems arising from the discretization of Maxwell-or Helmholtz-type operators in electromagnetics. We develop a Krylov subspace projection technique built upon short-term vector recurrences that does not require full reorthogonalization and can approximate simultaneously both left and right eigenvectors. We report on experiments for solving eigenproblems arising in the analysis of dielectric waveguides and scattering applications from PEC structures. The theoretical and numerical results reported in this study will contribute to highlight the potential and enrich the database of this technology for solving generalized eigenvalue problems in Computational Electromagnetics.

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Section: Numerical Experimentsmentioning

confidence: 99%

A Novel Lanczos-Type Procedure for Computing Eigenelements of Maxwell and Helmholtz Problems

Carpentieri¹,

Jing

Huang

2010

PIER

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“…The cold-test parameters for series of pitches were simulated by Ansoft HFSS which can get a credible result [17,18]. The optimization parameters were recorded in x and the initial variable was generated by randomly changing each parameter.…”

Section: Example Optimization Design Of a Space Twtmentioning

confidence: 99%

Numerical Optimization of Pitch Profile for Overall Efficiency Enhancement of a Space TWT

Yi¹,

Liu²,

Xiao³

2010

PIER C

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Abstract-Obtaining higher efficiency during the development of space Traveling Wave Tubes (TWTs) is always one of the most important goals for scientists. In this paper, a scheme of obtaining the maximum theoretical overall efficiency is explored by optimizing the helix pitch profile of a TWT based on the collectability of spent beam. The collectability of the spent beam was evaluated by the maximum collector efficiency, and this maximum collector efficiency was employed to calculate the maximum theoretical overall efficiency. The energy distribution of the spent beam and the output power of TWTs were calculated by the 3-D large signal Beam-Wave Interaction Simulator (BWIS) of MTSS. The detailed design of a Ku-band helix TWT is described according to three optimization goals (theoretical overall efficiency, theoretical collector efficiency and electronic efficiency). The simulation results indicate that the optimization for high interaction circuit efficiency or collector efficiency by itself is not adequate to obtain maximum overall efficiency. The maximum theoretical overall efficiency of 77% was achieved via the optimization of slow wave structure for theoretical overall efficiency.

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“…As the key device, the amplifier critically determines the performance of the whole inter-satellite systems. Due to its outstanding combined performances in power capacity and bandwidth, traveling-wave tube (TWT) is one of the most important millimeter-wave amplifiers [2][3][4][5][6][7][8][9]. As a full-metal structure, coupledcavity has been shown to have excellent performance in power capability.…”

Section: Introductionmentioning

confidence: 99%

Design of a v-Band High-Power Sheet-Beam Coupled-Cavity Traveling-Wave Tube

Yang¹,

Xu²,

Wei³

et al. 2012

PIER

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Abstract-The design and analysis of a high-power wideband sheetbeam coupled-cavity traveling-wave tube operating at V-band is presented. The interaction circuit employs three-slot doubly periodic staggered-ladder coupled-cavity slow-wave structure, and a 5 : 1 aspectratio sheet electron beam is used to interact with the circuit. Combined with design of the well-matched input and output couplers, a 3-D particle-in-cell model of the sheet-beam coupled-cavity traveling-wave tube is constructed. The electromagnetic characteristics and the beamwave interaction of the tube are investigated. From our calculations, this tube can produce saturated output power over 630 Watts ranging from 58 GHz to 64 GHz when the cathode voltage and beam current are set to 13.2 kV and 300 mA, respectively. The corresponding saturated gain and electron efficiency can reach over 32.5 dB and 15.9%. Compared with the circular beam devices, the designed sheetbeam TWT has absolute advantage in power capability, and also it is more competitive in bandwidth and electron efficiency.

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The Analytical Design of a Folded Waveguide Traveling Wave Tube and Small Signal Gain Analysis Using Madey's Theorem

Cited by 16 publications

References 37 publications

A Novel Lanczos-Type Procedure for Computing Eigenelements of Maxwell and Helmholtz Problems

A Novel Lanczos-Type Procedure for Computing Eigenelements of Maxwell and Helmholtz Problems

Numerical Optimization of Pitch Profile for Overall Efficiency Enhancement of a Space TWT

Design of a v-Band High-Power Sheet-Beam Coupled-Cavity Traveling-Wave Tube

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