Repetitive Operation of an $S$-Band 1-GW Relativistic Klystron Amplifier

Huang, Hua; Feng, D-C; Luo, G-Y; Lei, Lurong; Chen, Zh.G.; Liao, Yong; Tan, Jie; Xiao, Jin; Fanbao, Meng

doi:10.1109/tps.2007.893263

Cited by 33 publications

(7 citation statements)

References 3 publications

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“…This improved split-horn antenna will be useful for a high-power array antenna application to be able to transmit several GW HPEM pulses through the air without the occurrence of dielectric/air breakdown. With the rapid development of wireless communication systems, planar printed quasi-Yagi antennas have drawn much attention due to their great merits of simple structure, low profile, light weight, high gain, and ease of fabrication [1][2][3][4][5][6][7][8][9][10][11]. For the bandwidth enhancement of the conventional quasi-Yagi antennas, there are mainly three kinds of approaches via the changes of the director, driver and reflector, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…For the bandwidth enhancement of the conventional quasi-Yagi antennas, there are mainly three kinds of approaches via the changes of the director, driver and reflector, respectively. The first method is adding one or more directors [2][3][4][5] based on only one director version of the traditional quasi-Yagi antenna Tatsuo Itoh proposed in [1]. The position of directors appended above the driver needs to be carefully optimized.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced window breakdown threshold of the split‐horn antenna using an E‐plane field shaper

Choi

Shin

2016

Micro & Optical Tech Letters

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A compact split-horn antenna with a high-power handling capability to be able to radiate high-power pulse energy through vacuum dielectric window into the free space without the occurrence of dielectric/air breakdown is proposed at S-band. To increase the threshold of dielectric/air and vacuum/dielectric breakdown, it uses the special E-plane field shaper at the edges of the split-horn aperture. The proposed split-horn antenna has a high-power handling capability of 50 MW which is five times larger than that of the conventional split-horn antenna of 10 MW for the air breakdown threshold of 30 kV cm 21 as well as a similar antenna gain and a radiation pattern.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Enhanced window breakdown threshold of the split‐horn antenna using an E‐plane field shaper

Choi

Shin

2016

Micro & Optical Tech Letters

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“…They are widely used in the several fields of applied physics and engineering, including plasma heating and current drive, RF acceleration of charged particles, radar, and communications systems, and high peak power sources for weapons‐effect simulation and exploratory development . Recently, giga‐watt level backward‐wave oscillator and relativistic klystron amplifier at S‐band has been developed . With the development of more powerful HPEM sources, the power handling capacity of both accelerator structures and high power microwave devices has become the crucial factor of limiting HPEM pulse transmission and radiation.…”

Section: Introductionmentioning

confidence: 99%

Hundreds megawatt‐level pulse transmission waveguide vacuum port using series inductive post‐wall

Choi

Shin

et al. 2014

Micro & Optical Tech Letters

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A simple waveguide vacuum port for hundreds MW pulse transmission at S-band is proposed. It uses the series inductive post-wall to improve the characteristics of the RF leakage attenuation and maximize the unit area of the vacuum port related with effective pumping speed. This type of vacuum port significantly increases RF leakage attenuation above 250 dB without RF electrical breakdown phenomena and provides simple structure to enhance the conductance C wg2p of the waveguide vacuum port found to be around 0:7C wg for above 250 dB RF leakage attenuation.ABSTRACT: Microstrip bandpass filter with fragment-loaded resonators is proposed and designed using multiobjective evolutionary algorithm based on decomposition combined with enhanced genetic operators (MOEA/D-GO). When loaded by fragment-type structures, microstrip resonators may have compact size and operate at different modes. By properly setting the modes of fragment-loaded resonators in objectives of MOEA/D-GO, stopband attenuation and spurious passband suppression of the microstrip bandpass filter can be readily adjusted and controlled.

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“…It has been proved that the RKA can be as one of the most promising HPM and radio-frequency (RF) sources in the frequency range of 0.1-10 GHz and the gigawatt power range [4]- [9]. After its initial development at the Naval Research Laboratory (NRL), there are now several areas of investigation on long-pulse, repeated, L-band, S-band, J-band, and X-band RKAs.…”

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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Repetitive Operation of an $S$-Band 1-GW Relativistic Klystron Amplifier

Cited by 33 publications

References 3 publications

Enhanced window breakdown threshold of the split‐horn antenna using an E‐plane field shaper

Enhanced window breakdown threshold of the split‐horn antenna using an E‐plane field shaper

Hundreds megawatt‐level pulse transmission waveguide vacuum port using series inductive post‐wall

Simulation Studies of a Relativistic Klystron With Strong Input Power

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