Noise Performance of Frequency- and Phase-Locked CW Magnetrons Operated as Current-Controlled Oscillators

Tahir, I.; Dexter, A.; Carter, Richard G.

doi:10.1109/ted.2005.854276

Cited by 49 publications

(23 citation statements)

References 7 publications

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“…Note that experiments described in [2,16,17] http://projectx he results of a series of tes S-band, 1 kW mic m capabilities of magnetrons injection-locked by a phasemodulated signal allowing wideband dynamic amplitude and phase control in experimental model of the high-power transmitter. Injection-locked magnetrons are very low phase noise, efficient RF sources with a promising future for feeding SRF cavities for particle accelerators.…”

Section: Figmentioning

confidence: 99%

High-power magnetron transmitter as an RF source for superconducting linear accelerators

Kazakevich

Johnson

Flanagan

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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A concept of a high-power magnetron transmitter utilizing the vector addition of signals of Continuous Wave (CW) magnetrons, injection-locked by phase-modulated signals, and intended to operate within a wideband control feedback loop in phase and amplitude, is presented. This transmitter is proposed to drive Superconducting RF (SRF) cavities for intensity-frontier GeV-scale proton/ion linacs, including linacs for Accelerator Driven System (ADS). The transmitter performance was verified in experiments with CW, S-Band, 1 kW magnetrons. A wideband dynamic control of magnetrons, required for the superconducting linacs, was realized using the magnetrons, injectionlocked by the phase-modulated signals. The capabilities of the magnetrons injection-locked by the phase-modulated signals and adequateness for feeding of SRF cavities have been verified by measurements of the transfer function magnitude characteristics of single and 2-cascade magnetrons in the phase modulation domain, by measurements of the magnetrons phase performance and by measurements of spectra of the carrier frequency of the magnetrons. At the ratio of power of locking signal to output power of ≥ -13 dB (in 2-cascade scheme per magnetron, respectively) we demonstrated a phase modulation bandwidth of over 1.0 MHz for injection-locked CW single magnetrons and a 2-cascade setup, respectively. The carrier frequency spectrum (width of ~ 1 Hz at the level of <-60 dBc) of the magnetron, injection-locked by a phase-modulated signal, did not demonstrate broadening at wide range of magnitude and frequency of the phase modulation. The wideband dynamic control of output power of the transmitter model has been first experimentally demonstrated using two CW magnetrons, combined in power and injection-locked by the phasemodulated signals. The experiments with the injection-locked magnetrons adequately emulated the wideband dynamic control with a feedback control system, which will allow to suppress parasitic modulation of the accelerating field in the SRF cavities, resulted from mechanical noises, phase perturbations, caused by cavity beam loading and cavity dynamic tuning errors, low-frequency ripples of the magnetron power supplies, etc. The magnetron transmitter concept, tests of the transmitter models and injection-locking of magnetrons by phase-modulated signals are discussed in this work.

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Section: Figmentioning

confidence: 99%

High-power magnetron transmitter as an RF source for superconducting linear accelerators

Kazakevich

Johnson

Flanagan

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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“…Recently the authors [19,20] have demonstrated the phase locking of a 2.45 GHz ''cooker'' magnetron with injection power 40 dB below the output power and without rigorous restrictions on power supply voltage ripple, load fluctuations, and thermal stabilization of the anode or restriction of the cathode heater power. This was achieved by injection locking the magnetron while its frequency was stabilized with a phase locked loop acting on the anode current and utilizing the magnetron frequency pushing characteristic.…”

Section: Magnetron Operation and Lockingmentioning

confidence: 99%

“…With an external control, one has many options including a fixed modulation or operation at constant frequency utilizing the magnetron's pushing characteristic. Constant natural frequency control of a magnetron without a cavity (superconducting or normal) has been described previously [19,20].…”

Section: Rf Systemmentioning

confidence: 99%

First demonstration and performance of an injection locked continuous wave magnetron to phase control a superconducting cavity

Carter

Tahir

Wang

et al. 2011

Phys. Rev. ST Accel. Beams

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“…Their power ranges from 1 to 100 kW at 915 MHz and 1-30 kW at 2.45 GHz. Advanced high power magnetrons with efficiency >80% and phase stability within 2°are required for future microwave systems in industrial [1], scientific [2], and energy sectors [3]. Efforts are being directed to develop such magnetrons at 2.45 GHz for industrial applications [2] and at 5.8 GHz for space solar power systems [3].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic and Particle-in-Cell Simulation Studies of a High Power Strap and Vane CW Magnetron

Vyas

Maurya

Singh

2014

IEEE Trans. Plasma Sci.

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This paper presents electromagnetic and particlein-cell (PIC) simulation studies of ring strapped vane resonator of a 2.45 GHz 1-kW magnetron using Computer Simulation technology microwave studio and MAGIC-3-D. The aim was to gain design understanding through the analysis of constituent parts of the resonant system and to deduce results having significant engineering value. The electromagnetic analysis includes modeling the effect of the end-gap length, the straps, the coupling antenna, and the surface roughness of cavity wall on resonant frequency. It was found that a clearance of 4 mm and beyond between cavity resonator and end plate have negligible effect on resonance frequency. Straps influence the resonant frequency of the π mode maximum, and can be used to control and fine tune the resonant frequency of the desired π mode. A surface roughness of 1 μm or more affects the unloaded Q of the resonator cavity adversely. Coupling antenna height is found to play an important role to achieve desired Q l and Q ext for the segment loaded axial extraction of power. The PIC simulation study predicted that the hot resonant frequency differ from cold resonant frequency by ∼9 MHz. The computed frequency, power, and efficiency were found to be 2.462 GHz, 1.3 kW, and 70%, respectively.Index Terms-Cold resonant frequency, electromagnetic and particle-in-cell (PIC) simulation, hot resonant frequency, industrial magnetron, virtual prototyping.

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Noise Performance of Frequency- and Phase-Locked CW Magnetrons Operated as Current-Controlled Oscillators

Cited by 49 publications

References 7 publications

High-power magnetron transmitter as an RF source for superconducting linear accelerators

High-power magnetron transmitter as an RF source for superconducting linear accelerators

First demonstration and performance of an injection locked continuous wave magnetron to phase control a superconducting cavity

Electromagnetic and Particle-in-Cell Simulation Studies of a High Power Strap and Vane CW Magnetron

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