Design and operation of a module of phase-locked relativistic magnetrons

Levine, Jerrold S.; Aiello, N.; Benford, James; Harteneck, B.

doi:10.1063/1.349347

Cited by 46 publications

(20 citation statements)

References 12 publications

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“…To further improve the microwave power which is limited by the physics mechanism and geometry dimension, a new method, the power combining, was developed [1]- [3]. In order to combine the outputs of multiple HPM sources in a steerable antenna array, the sources must be at the same frequency and be phase coherent, i.e., phase constant during a pulse and phase stable from pulse to pulse.…”

Section: Introductionmentioning

confidence: 99%

Simulation Studies of a Relativistic Klystron With Strong Input Power

Song

Liu²,

Lin

et al. 2008

IEEE Trans. Plasma Sci.

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As one of the potential high-power microwave devices on the level of gigawatts, relativistic klystron amplifier (RKA) can be used for power combination to further improve the radiation microwave power. Because of self-excited oscillation of the intense relativistic electron beam, the frequency and phase characteristics of general relativistic klystron devices are independent with the driven microwave pulse. In order to obtain frequency and phase locking, a method of improving the input power is put forward to inhibit these parasitic oscillations. This paper reports a particle-in-cell simulation study of the RKA's characteristics under the condition of strong power feeding. By making use of the 500-keV 6-kA electron beam, the simulation results show that strong input power can inhibit the parasitical oscillations in cavity and modulate the beam very well with only one cavity. About 5.4-kA modulation current and a microwave with power of 1.4 GW, bandwidth of 5%, and efficiency of 50% are obtained. The new amplifier driven by the strong input power proves to be a potential device to attain high amplitude stability, high efficiency, high spectral purity, wide bandwidth, and low level of phase and amplitude noise.Index Terms-High-power microwave (HPM), particle-in-cell (PIC) simulation, phase locking, relativistic klystron.

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Section: Introductionmentioning

confidence: 99%

Simulation Studies of a Relativistic Klystron With Strong Input Power

Song

Liu²,

Lin

et al. 2008

IEEE Trans. Plasma Sci.

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show abstract

“…Thus, a new technique named high power microwave combination is put forward to further increase the outputs of HPM sources. [1][2][3][4][5][6] In order to effectively realize the power combination of multiple HPM devices, the sources must be at the same frequency and be phase coherent, i.e., phase constant within one pulse and phase stable from pulse to pulse. Compared with the HPM oscillators, the HPM amplifiers are more stable in frequency and phase because they respond well to the characteristics of the external injection signals.…”

Section: Introductionmentioning

confidence: 99%

Design and 3D simulation of a two-cavity wide-gap relativistic klystron amplifier with high power injection

2012

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By using an electromagnetic particle-in-cell (PIC) code, an S-band two-cavity wide-gap klystron amplifier (WKA) loaded with washers/rods structure is designed and investigated for high power injection application. Influences of the washers/rods structure on the high frequency characteristics and the basic operation of the amplifier are presented. Generally, the rod structure has great impacts on the space-charge potential depression and the resonant frequency of the cavities. Nevertheless, if only the resonant frequency is tuned to the desired operation frequency, effects of the rod size on the basic operation of the amplifier are expected to be very weak. The 3-dimension (3-D) PIC simulation results show an output power of 0.98 GW corresponding to an efficiency of 33% for the WKA, with a 594 keV, 5 kA electron beam guided by an external magnetic field of 1.5 Tesla. Moreover, if a conductive plane is placed near the output gap, such as the electron collector, the beam potential energy can be further released, and the RF power can be increased to about 1.07 GW with the conversion efficiency of about 36%. V C 2012 American Institute of Physics.

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“…[3][4][5] In 1989, Levine et al first realized phase-locking of two relativistic magnetrons in experiment which were connected by a waveguide coupler. 6,7 This suggested the feasibility of the coherent power combination of an array of magnetrons.…”

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confidence: 97%

A new compact self-coherent high power microwave source based on dual beams

2015

Phys. Plasmas

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In this paper, a compact self-coherent high power microwave source based on dual beams is presented. It consists of a two-cavity triaxial klystron amplifier (TKA) (noted as the outer sub-source below) and a multiwave Cerenkov generators (noted as the inner sub-source) inserted in the TKA's inner conductor. These two sub-sources share a common cathode and the magnetic field. The injected signals to the outer sub-source are leakage microwaves from the inner sub-source through the anode-cathode gap (A-K gap). Particle-in-cell simulation shows that when the diode voltage is 687 kV and the axial magnetic field is 0.8 T, two microwaves with power of 1.02 GW and 2.65 GW and the same frequency of 9.72 GHz are generated in the inner and the outer sub-source, respectively; the corresponding power efficiencies are 24% and 31%. Two sub-sources reach the phase locking at 23 ns with a phase difference fluctuation within 63 . The fast and stable phase locking in the voltage ranging from 665 kV to 709 kV further suggests that the proposed source is promising for coherent power combination and to export a higher power of combined microwaves. V C 2015 AIP Publishing LLC. [http://dx.

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Design and operation of a module of phase-locked relativistic magnetrons

Cited by 46 publications

References 12 publications

Simulation Studies of a Relativistic Klystron With Strong Input Power

Simulation Studies of a Relativistic Klystron With Strong Input Power

Design and 3D simulation of a two-cavity wide-gap relativistic klystron amplifier with high power injection

A new compact self-coherent high power microwave source based on dual beams

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