Compact Dual-Frequency Relativistic Magnetron With TEM Mode Output

He, Chaoxiong; Li, Tianming; Cheng, Renjie; Wang, Haiyang; Li, Hao; Zhou, Yihong; Wang, Keqiang; Ghannouchi, Fadhel M.; Hu, Biao

doi:10.1109/ted.2020.3012424

Cited by 7 publications

(4 citation statements)

References 20 publications

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“…1, four criteria guided the future RM design presented in this article. To reduce leakage currents and improve power efficiency, it is common to add endcaps at each end of the cathode [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [15], [16], [17]. Based on the 3-D designs, we judged the structure's ability to add endcaps while maintaining power-handling capacity.…”

Section: A Time Solver Methods For Em Output Evaluationmentioning

confidence: 99%

“…to enhancing the performances over the last decade, either by increasing power efficiency, by improving compactness, or by reducing pulse-shortening effects [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21].…”

mentioning

confidence: 99%

“…Among significant progress in recent years, geometries based on an efficient structure with all-cavity electromagnetic (EM) radial extraction by coupling slots have been extensively described in other scientific papers [9], [10], [11], [12], [14]. A design introduced in 2012 [22], shows good performance with improved compactness.…”

mentioning

confidence: 99%

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Compact Efficient and Frequency Tunable Relativistic Magnetron With Reducing Coaxial Section and Tilted Tuners

Delvert,

Chauloux,

Diot

et al. 2023

IEEE Trans. Electron Devices

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In this article, we present a compact efficient and frequency tunable relativistic magnetron (RM) with what we have named a reducing coaxial section (RCS) and with tilted tuners. The RCS is a conical-shaped part inserted in front of the output window. The design is adapted to the compact Marx generator of the Concept Léger Aéroporté d'Illuminateur RadioElectrique (CEA)-Gramat demonstrator-Commissariat à l'Energie Atomique et aux Energies Alternatives (CLAIRE)-and meets technical requirements such as input impedance (specifically during frequency shifting), mechanical dimensions, power handling capacity, and electromagnetic (EM) mode. Special care has been taken to lower the EM mode competition, which occurs with specific geometry, extraction waveguide with high dimensions, and/or frequency shifting. To mitigate this effect, the output waveguide diameter was decreased by means of the RCS design. Another challenge was to operate frequency shifting by adding tuners while maintaining high power handling. The premise is that cathode endcap spheres and tilted tuners theoretically reduce the electric field strength from 600 to 280 kV/cm. Particle-in-cell (PIC) simulation exhibits an output power (averaged over the pulse duration) that reaches 680 MW at 1.85 GHz. The corresponding maximum power efficiency is about 50% when the applied voltage is 380 kV, and the current intensity is about 3.8 kA. The frequency operating range is above 19% from 1.85 to 2.25 GHz.

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Section: A Time Solver Methods For Em Output Evaluationmentioning

confidence: 99%

mentioning

confidence: 99%

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Compact Efficient and Frequency Tunable Relativistic Magnetron With Reducing Coaxial Section and Tilted Tuners

Delvert,

Chauloux,

Diot

et al. 2023

IEEE Trans. Electron Devices

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“…In high-frequency applications, it has been demonstrated that the external alternating field of the dielectric approximates a transverse electromagnetic wave, where the electric field direction is always perpendicular to the transmission direction [31,32]. Therefore, in this work, the applied electric field was assumed to be a plane wave propagating along the x-direction, and the electric field direction propagates along the y-direction, which is expressed as follows:…”

Section: Model Parameter Setting and Model Verificationmentioning

confidence: 99%

Effect of Coating Shell on High-Frequency Polarization Loss of Core-Shell Filler Dielectric Composites: An Alternating-Field Polarization Phase-Field Simulation of BN@SiO2/PTFE Composite

Shen

et al. 2023

Materials

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Introducing a coating shell between the filler and matrix is an effective way to reduce the dielectric loss of the particle/matrix dielectric composites. It found that besides the improvement in interface compatibility, there may be some other effects of the coating shell, such as the elimination of the dielectric mismatch. However, the specific mechanism is still unclear due to the absence of an effective model for the quantitative analysis of the relationship between core–shell structure and dielectric loss, hindering the progress of the dielectric composite design. Here, a phase-field model for simulating high-frequency, alternating-field polarization is employed to study the relationship between high-frequency polarization loss and the coating shell in the silicon dioxide coating boron nitride polytetrafluoroethylene-based (BN@SiO2/PTFE) composite. The results show that the dielectric mismatch makes the high-frequency polarization loss spatially localized and periodically time-variant. The reduction of polarization loss depends on the polarization loss of SiO2. To reduce the high-frequency dielectric loss of the composite, the coating shell should not only eliminate the dielectric mismatch, but its dielectric loss must also be lower than that of the core filler. Furthermore, the model provided in this work has the potential to extend the quantitative calculation of non-intrinsic polarization loss and conduction loss.

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Analysis of mode excitation of a relativistic magnetron with azimuthal-periodic-cavity extraction

et al. 2022

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Relativistic magnetron (RM) with all cavity-magnetron axial extraction (ACMAE) has attracted much attention, benefiting from its good performance. In this paper, RM with ACMAE is generalized to a general case called RM with azimuthal-periodic-cavity extraction due to the introduction of two structure parameters of R and S, where R indicates the number of cavities between the two extraction cavities in a coupling waveguide and S indicates the number of cavities between two adjacent coupling waveguides. The necessary conditions for mode excitation of the RM are theoretically investigated and verified by simulations. Using the expression of the necessary conditions, one can easily figure out the output mode components of the RM in theory according to the structural parameters and the number of electron spokes. This new technique provides more solving schemes with different extraction structures for designing high performance RMs with different advantages in applications of high power microwave.

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Compact Dual-Frequency Relativistic Magnetron With TEM Mode Output

Cited by 7 publications

References 20 publications

Compact Efficient and Frequency Tunable Relativistic Magnetron With Reducing Coaxial Section and Tilted Tuners

Compact Efficient and Frequency Tunable Relativistic Magnetron With Reducing Coaxial Section and Tilted Tuners

Effect of Coating Shell on High-Frequency Polarization Loss of Core-Shell Filler Dielectric Composites: An Alternating-Field Polarization Phase-Field Simulation of BN@SiO2/PTFE Composite

Analysis of mode excitation of a relativistic magnetron with azimuthal-periodic-cavity extraction

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