A reliable, compact, and repetitive-rate high power microwave generation system

Li, Wei; Li, Zhiqiang; Xiao, Sun; Zhang, Jun

doi:10.1063/1.4935500

Review of Scientific Instruments

2015

DOI: 10.1063/1.4935500

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A reliable, compact, and repetitive-rate high power microwave generation system

Wei Li

Zhiqiang Li

Sun Xiao

et al.

Abstract: A compact high power microwave (HPM) generation system is described in this paper. The main parts of the HPM system are a Marx generator with a pulse forming line and a magnetron with diffraction output. The total weight and length of the system are 250 kg and 120 cm, respectively. The output microwave power of the HPM system at 550 kV of applied voltage and 0.33 T of magnetic field reaches 1 GW at 2.32 GHz of central frequency with 38 ns of pulse duration, 23% of power conversion efficiency, and Gaussian radi… Show more

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Cited by 7 publications

References 16 publications

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Development and testing of a three-section pulse-forming network and its application to Marx circuit

Song

Zhang

et al. 2019

Laser Part. Beams

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A three-section pulse forming network (PFN) based on Guillemin type-C circuit was developed to meet the challenge of a compact design, high withstand voltage, and high-quality output waveform with fast rise time, flat-top duration, and 100-ns pulse width. A simplified pulse forming circuit was proposed and studied that includes only three LC-sections connected in parallel, with each section containing an inductor and a capacitor connected in series. The effect of the capacitance deviation on the output waveform was investigated. The simulation results show that when the capacitance deviation exceeds +3%, both the flat top and fall time of the output waveform of single PFN module deteriorate greatly. Fortunately, in a multi-stage PFN-Marx circuit, even if the capacitance deviation exceeds +10%, when the average capacitance of the same LC sections is close to the theoretical value, the output waveform maintains a good quality and is in good agreement with the theoretical prediction. The compact three-section PFN developed during this project has a size of only 360 mm × 342 mm × 65 mm, and a maximum withstand voltage of 120 kV. Sixteen PFN stages were assembled to form a Marx generator with design parameters to provide of an output peak power of 12 GW and a maximum peak current of 15 kA. The tested output waveform agrees well with the theoretical results, having a rise time of 31 ns, a flat-top of 104 ns, and a pulse with of 164 ns.

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Development and testing of a three-section pulse-forming network and its application to Marx circuit

Song

Zhang

et al. 2019

Laser Part. Beams

View full text Add to dashboard Cite

show abstract

Preliminary experimental investigation of an X-band Cerenkov-type high power microwave oscillator without guiding magnetic field

Guo

Shu

et al. 2017

Review of Scientific Instruments

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Among high power microwave (HPM) generators without guiding magnetic field, Cerenkov-type oscillator is expected to achieve a relatively high efficiency, which has already been realized in X-band in our previous simulation work. This paper presents the preliminary experimental investigations into an X-band Cerenkov-type HPM oscillator without guiding magnetic field. Based on the previous simulation structure, some modifications regarding diode structure were made. Different cathode structures and materials were tested in the experiments. By using a ring-shaped graphite cathode, microwave of about one hundred megawatt level was generated with a pure center frequency of 9.14 GHz, and an efficiency of about 1.3%. As analyzed in the paper, some practical issues reduce the efficiency in experiments, such as real features of the electron beam, probable breakdown regions on the cathode surface which can damage the diode, and so forth.

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Novel frequency stability measurement method with whole sample time range

Xue

et al. 2018

Review of Scientific Instruments

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A method to measure the frequency stabilities with a nearly whole range of sample time is presented. Precision as high as 10/100 ns has been obtained by it when measuring transient stability with 100 ns sample time, 10/s has been obtained toward short-term stability with 1 s sample time, and 10/day has been obtained with regard to long-term stability with 1 day sample time. In addition, because the frequency stabilities in a wider range of sample time can correspond to the phase noise index more accurately, the phenomena which are difficult to be observed in a phase noise curve can be detected through this measurement.

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A reliable, compact, and repetitive-rate high power microwave generation system

Cited by 7 publications

References 16 publications

Development and testing of a three-section pulse-forming network and its application to Marx circuit

Development and testing of a three-section pulse-forming network and its application to Marx circuit

Preliminary experimental investigation of an X-band Cerenkov-type high power microwave oscillator without guiding magnetic field

Novel frequency stability measurement method with whole sample time range

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