Locking of Magnetrons by an Injected RF Signal

Thal, H.L.; Lock, R.G.

doi:10.1109/tmtt.1965.1126114

Cited by 9 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This interaction results in an energy exchange between the wave and the electrons. The developed model enables evaluation of the necessary and sufficient conditions for the coherent generation of the magnetron and substantiates coherent generation of the tube below the selfexcitation threshold voltage unlike traditionally used model of the "Reflecting amplifier" [7], which considers only forced oscillation.…”

Section: Introductionmentioning

confidence: 90%

Stimulated Generation of Magnetrons powered below the Self-Excitation Threshold Voltage

Kazakevich

Johnson

Khabiboulline

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 90%

Stimulated Generation of Magnetrons powered below the Self-Excitation Threshold Voltage

Kazakevich

Johnson

Khabiboulline

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

“…The consideration was based on the study of the locking phenomena in a triode oscillator [5]. Later, magnetrons were represented as amplifiers [6,7], and the concept of injection locking was applied to them. The phase locking of magnetrons to synchronize them in normal conducting accelerators was suggested in [8].…”

Section: Introductionmentioning

confidence: 99%

Resonant interaction of the electron beam with a synchronous wave in controlled magnetrons for high-current superconducting accelerators

Kazakevich

Johnson

Lebedev

et al. 2018

Phys. Rev. Accel. Beams

View full text Add to dashboard Cite

A simplified analytical model of the resonant interaction of the beam of Larmor electrons drifting in the crossed constant fields of a magnetron with a synchronous wave providing a phase grouping of the drifting charge was developed to optimize the parameters of an rf resonant injected signal driving the magnetrons for management of phase and power of rf sources with a rate required for superconducting high-current accelerators. The model, which considers the impact of the rf resonant signal injected into the magnetron on the operation of the injection-locked tube, substantiates the recently developed method of fast power control of magnetrons in the range up to 10 dB at the highest generation efficiency, with low noise, precise stability of the carrier frequency, and the possibility of wideband phase control. Experiments with continuous wave 2.45 GHz, 1 kW microwave oven magnetrons have verified the correspondence of the behavior of these tubes to the analytical model. A proof of the principle of the novel method of power control in magnetrons, based on the developed model, was demonstrated in the experiments. The method is attractive for high-current superconducting rf accelerators. This paper also discusses vector methods of power control with the rates required for superconducting accelerators, the impact of the rf resonant signal injected into the magnetron on the rate of phase control of the injection-locked tubes, and a conceptual scheme of the magnetron transmitter with highest efficiency for high-current accelerators.

show abstract

“…[11] The conventional methods of addressing the coupling between the output frequency and power as well as reducing the noise of the free-running magnetron spectra include external-injection locking, power supply system improvement, and the combination of these two techniques. [6,[11][12][13][14][15][16] Usually, external-injection locking can lock the output frequency of a magnetron at the injection frequency, thus improving the phase noise. However, the locking bandwidth depends greatly on the injection ratio.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, expensive solid-state drivers are required to achieve wide locking bandwidths for high-power magnetrons. [12][13][14][15] Furthermore, the power supply system also significantly affects the output performance of a magnetron. Therefore, previous researchers also studied the combination of external-injection locking and using an improved power supply system to reduce the injection ratio and to improve the noise performance.…”

Section: Introductionmentioning

confidence: 99%

Analysis and experiments of self-injection magnetron

Zhang¹,

Ye²,

Yuan³

et al. 2016

Chinese Phys. B

View full text Add to dashboard Cite

Magnetrons are widely used in microwave-based industrial applications, which are rapidly developing. However, the coupling between their output frequency and power as well as their wideband spectra restricts their further application. In this work, the output frequency and power of a magnetron are decoupled by self-injection. Moreover, the spectral bandwidth is narrowed, and the phase noise is reduced for most loop phase values. In order to predict the frequency variation with loop phase and injection ratio, a theoretical model based on a circuit equivalent to the magnetron is developed. Furthermore, the developed model also shows that the self-injection magnetron is stabler than the free-running magnetron and that the magnetron's phase noise can be reduced significantly for most loop phase values. Experimental results confirm the conclusions obtained using the proposed model.

show abstract

Locking of Magnetrons by an Injected RF Signal

Cited by 9 publications

References 4 publications

Stimulated Generation of Magnetrons powered below the Self-Excitation Threshold Voltage

Stimulated Generation of Magnetrons powered below the Self-Excitation Threshold Voltage

Resonant interaction of the electron beam with a synchronous wave in controlled magnetrons for high-current superconducting accelerators

Analysis and experiments of self-injection magnetron

Contact Info

Product

Resources

About