A New Approach for High-Power Coaxial Magnetron Using Stacked Anode Resonators

Joshi, Mohit; Vyas, Sandeep Kumar; Tiwari, T.; Bhattacharjee, Ratnajit

doi:10.1109/ted.2020.2973029

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…The energy of electromagnetic field coupling in each cavity of the resonant circuit is represented by a parallel circuit of capacitance, inductance and conductance; the equivalent circuit of the single-hole-slot magnetron resonant system is shown in Figure 5, where C, L and G are equivalent to capacitance, inductance and conductance, respectively. Thus, the resonant frequency of the equivalent parallel circuit of the magnetron is given by Equation (6). In Figure 5b, the consideration of an equivalent one-section network for the interaction space is described in terms of the network.…”

Section: The Analysis Of Resonant Frequency By Equivalent Circuit Methodsmentioning

confidence: 99%

“…A magnetron is a high-power oscillator generating an electromagnetic field and used in a wide range of applications including military radar, aerospace, navigation and medical use [1][2][3][4][5][6]. Among the various high-power oscillators, a magnetron can be manufactured with compact size, high efficiency, light weight and simple structure.…”

Section: Introductionmentioning

confidence: 99%

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Parameter Optimization of Hole-Slot-Type Magnetron for Controlling Resonant Frequency of Linear Accelerator 6 MeV by Reverse Engineering Technique

et al. 2021

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This paper presents the parameter optimization of a twelve-hole-slot-type magnetron based on a reverse engineering technique to improve a 6-MeV linear accelerator (LINAC) operation for fruit sterilization. The magnetron structural dimensions are measured by a coordinate measuring machine (CMM) that has tolerance on a dimension of 0.5 µm to analyze the resonant frequency with a desired operating point of the magnetron in the dominant mode. There are two methods of analysis using a proper parameter for the magnetron operation. The first method is mathematical model analysis of an equivalent resonant parallel circuit. The other is 3D-model drawing of the magnetron based on particle-in-cell (PIC) using computer simulation technology microwave studio (CST). The results are demonstrated by the position of the resonant frequency of each mode of operation, and the radius and tuner slot distance of a cavity within the structures of the magnetron cause a resonant frequency change. The suitable parameters of the voltage and magnetic field supply are desired to control a resonant frequency at 2.9982 GHz by using the Takagi–Sugeno fuzzy logic control (FLC) algorithm to control a resonant frequency at 2.9982 GHz. The results of the FLC algorithm application show that the LINAC can produce X-rays with a constant dose rate for an hour with a disturbance in the range of 38 to 42 °C temperature and 1 × 10−9 to 5 × 10−8 torr vacuum pressure.

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Section: The Analysis Of Resonant Frequency By Equivalent Circuit Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parameter Optimization of Hole-Slot-Type Magnetron for Controlling Resonant Frequency of Linear Accelerator 6 MeV by Reverse Engineering Technique

et al. 2021

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“…The phase locking of magnetrons can solve the random phase problem that occurs between different magnetrons; then, the signals produced by magnetrons will become coherent. There has been some progress [6][7][8][9][10][11][12][13][14][15] on the phase locking of magnetrons since phase-locking theories were introduced [16][17][18]. The phase locking of magnetrons can be concisely categorized into three distinct types based on different injection methods and the propagation directions of electromagnetic energy:…”

Section: Introductionmentioning

confidence: 99%

“…Mutual coupling locking [5,[7][8][9][10]21,22]: The third type comprises magnetrons that mutually inject electromagnetic energy through the same path. This approach is simple and reliable because it does not use microwave circulators with additional volume and weight.…”

mentioning

confidence: 99%

Particle-in-Cell Simulations on High-Efficiency Phase-Locking Millimeter-Wave Magnetrons with Unsynchronized High-Voltage Pulses

Song,

Meng,

Wang

et al. 2023

Electronics

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Phase locking is an essential choice for building a coherent array, and a system of phase-locked magnetrons is relatively compact and cheaper than other microwave sources. Previous theoretical and experimental studies on phase locking are conducted using synchronized high-voltage pulses. Here, we investigate the characteristics of two phase-locked magnetrons using particle-in-cell (PIC) simulation software (CST STUDIO SUITE 2020) when two high-voltage pulses have delays. The results show that the magnetrons produced two-level RF signals because the operation could be divided into two stages. The first stage happened when one cathode emitted electrons; then, the electrons formed one spoke, traveling in synchronism with the 0-phase difference mode. Two output ports both produced half the output power of a free-running magnetron. The second stage happened after another cathode started to emit electrons, which were instantly pre-modulated by the electromagnetic field of the 0-phase difference mode produced during the first stage. In the second stage, simulations showed that pre-modulation accelerated the process of electron bunching. Eventually, two magnetrons were phase-locked, and the total output power of the two identical magnetrons nearly doubled the output power of the free-running magnetron, which demonstrated that the magnetrons were phase-locked in the high-efficiency phase-locking regime.

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The effect of temperature on frequency and instability variations in a smooth-bore magnetron

2022

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In this paper, the frequency and instability variations under the influence of temperature effect in a cylindrical smooth-bore magnetron are investigated. To derive the eigenvalue equation, the Fourier transform of electrostatic flute perturbations together with the local approximation method along radial direction for perturbed density is applied to equations of the macroscopic fluid model and Poisson equation. The obtained eigenvalue equation is solved numerically by shooting to a fitting point method. The analysis of numerical results shows the change in frequency of second three azimuthal modes for the case when the perpendicular temperature is higher than the parallel temperature (T∥<T⊥), which is greater than the case when temperatures along azimuthal and radial directions are equal (T∥=T⊥) or T∥>T⊥. As the temperature rising, the frequency and growth rate instability increase except for Tr > Tθ that the growth rate instability is reduced until Tθ = 100 00k and then is increased. The minimum frequency variation is 0.002 GHz for the mode of l=1 at 2T∥=T⊥. The maximum change in frequency, in contrast, is 10.651 GHz for the mode of l=5 at 4T∥=T⊥. According to the obtained results, the temperature controlling could be help to frequency adjustment in magnetrons.

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A New Approach for High-Power Coaxial Magnetron Using Stacked Anode Resonators

Cited by 8 publications

References 14 publications

Parameter Optimization of Hole-Slot-Type Magnetron for Controlling Resonant Frequency of Linear Accelerator 6 MeV by Reverse Engineering Technique

Parameter Optimization of Hole-Slot-Type Magnetron for Controlling Resonant Frequency of Linear Accelerator 6 MeV by Reverse Engineering Technique

Particle-in-Cell Simulations on High-Efficiency Phase-Locking Millimeter-Wave Magnetrons with Unsynchronized High-Voltage Pulses

The effect of temperature on frequency and instability variations in a smooth-bore magnetron

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