A Compact, Repetitive, 500kV, 500 J, Marx Generator

Neuber, A.; Chen, Y.J.; Dickens, J.; Kristiansen, M.

doi:10.1109/ppc.2005.300570

Cited by 36 publications

(9 citation statements)

References 2 publications

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“…The vircator was driven by a 25 stages 500 kV/500 J reprate Marx generator [3], with pulse repetition frequency 10 Hz and output impedance 18 Ω. In the experimental study, the charging voltage has been varied between 13 kV and 15.5 kV in steps of 0.5 kV, giving a voltage of 180-230 kV over the vircator.…”

Section: Methodsmentioning

confidence: 99%

Optimization study with respect to the point of excitation in coaxial TE<inf>11</inf> vircator

Elfsberg

Akyuz

Moller

et al. 2013

2013 19th IEEE Pulsed Power Conference (PPC)

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The vircator is a compact and robust narrow band HPM source with a simple geometry. In the most basic version of the vircator, the operating frequency depends only on the distance between the anode and cathode and the applied voltage. In a compact system the vircator is often powered by a marx generator resulting in a frequency chirp caused by the double exponential voltage pulse generated by the marx. An experimental series with a coaxial TE11 vircator has been performed in which the excitation point and the applied voltage have been varied. Experimental evidence is presented showing that the frequency shift during the pulse can be avoided by choosing the proper excitation point. The highest radiated fields were recorded when the bandwidth of the microwave radiation was narrow and only one mode was present. Both far field and waveguide measurements were in agreement with the TE11 mode. At the optimum positions the input impedance of the vircator was lower, indicating improved coupling between electron beam and microwave field. To verify the experimental findings on optimum excitation point, electromagnetic simulations were performed. Even though the simulation model was greatly simplified by replacing the electron beam with a current sheath at the position of the emitters, the results were in good agreement with experiments.

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Section: Methodsmentioning

confidence: 99%

Optimization study with respect to the point of excitation in coaxial TE<inf>11</inf> vircator

Elfsberg

Akyuz

Moller

et al. 2013

2013 19th IEEE Pulsed Power Conference (PPC)

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show abstract

“…In the experiments reported on the vircator was driven by a 25 stages 500 kV/500 J repetitive Marx generator, repetition frequency 10 Hz, designed and built by Texas Tech University [5]. The output impedance for the Marx generator is 18 Ω.…”

Section: Methodsmentioning

confidence: 99%

Experimental study of a vircator with premodulated electron beam

Moller

Bieth

Delmote

et al. 2011

2011 IEEE Pulsed Power Conference

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An initial experimental study of a vircator where a feedback mechanism is used to premodulate the electron beam has been performed. The anode-cathode gap distance and the applied voltage were varied and their influence on the frequency content and field strength of the generated microwave pulse are investigated and compared with particle in cell simulations. The frequency content of the microwave radiation was in good agreement between experiments and simulations. The vircator was very narrow banded at 2 GHz.

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“…The axial vircator is housed in a standard three-way Con- repetitive Marx generator with an impedance of 18 Ω, constructed and built at Texas Tech University, USA [2]. In the experiments, the Marx generator was charged to 16 kV, giving 400 kV erected voltage and 320 J charged energy.…”

Section: Methodsmentioning

confidence: 99%

Experimental Studies of Anode and Cathode Materials in a Repetitive Driven Axial Vircator

Elfsberg

Hurtig

Larsson

et al. 2008

IEEE Trans. Plasma Sci.

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Repetitive use of a high-power-microwave radiation source implies strong erosion on cathode and anode materials. Electrode-material endurance has been studied in a series of experiments with an axial virtual cathode oscillator powered by a compact Marx generator. The Marx generator is operated in a 10-Hz repetitive mode with a burst of ten pulses. Velvet and graphite was used as electron-emitting materials, and they showed markedly different pulse characteristics. The following three different anode materials were used: stainless-steel mesh, stainless-steel wires, and molybdenum wires, which all had different influence on the pulse characteristics.

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A Compact, Repetitive, 500kV, 500 J, Marx Generator

Cited by 36 publications

References 2 publications

Optimization study with respect to the point of excitation in coaxial TE<inf>11</inf> vircator

Optimization study with respect to the point of excitation in coaxial TE<inf>11</inf> vircator

Experimental study of a vircator with premodulated electron beam

Experimental Studies of Anode and Cathode Materials in a Repetitive Driven Axial Vircator

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