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- 저자 : S. Pinguet (검색결과 1 건)
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Modular, Ultra-compact Marx Generators for Repetitive High-power Microwave Systems
R. Bischoff,J.-P. Duperoux,S. Pinguet 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
The essential demand for high-power microwave (HPM) devices for both military and civil applications, such as convoy protection and car stopping, requires compact repetitive pulsed-power generators. We report on the latest developments in technology of our balanced, coaxial Marx-type generators, which distinguish themselves by a fundamental modular concept for reasons of scalability. The Marx generators especially make use of inductive charging technology to ensure high repetitive operation. The Marx stages were completely redesigned. The old fibreglass housings have been replaced by new versions made of PVC. All electrical contacts were reworked to minimize the risk of parasitic discharges. Each new elementary stage of the Marx generator finally consists of eight 1.1 nF sector-of-a-cylinder ceramic capacitors in parallel, two charging coils with an optimized inductance of about 18.6 킜 and two halves of the spherical spark gaps. Marx generators with a variable number of stages were assembled and successfully tested up to charging voltages of 50 kV for up to 10 stages and 40 kV for the 20-stage version, respectively. The efficiency as a function of the stage number was investigated and proved to be about 7 % better than with a resistively charged version of ISL Marx generators. Burst mode operation for a duration of 10 s at a pulse repetition frequency of 100 Hz is reported. The recovery time of the spark gap arrangement inside the Marx generators was determined to be of about 4 ms by using nitrogen as the operating gas, indicating the potential of the ISL Marx generators to operate at pulse repetition frequencies of more than 200 Hz. In order to gain an in-depth insight into the behaviour of an inductive Marx generator during the charging and discharging phases and to derive precise information for the design of future generators, an advanced PSpice simulation model was developed. The breakdown dynamics of the spark gaps was implemented by making use of the Vlastos formula; parasitic effects such as stray capacitances were taken into account.
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