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Pulsed Power System for the Orion High Power Laser

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Mead M., Moncho-Banuls S., Pottier S., Brasile J.
Acta Physica Polonica A
|
2009
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vol. 115
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issue 6
978-979
EN
This paper describes the design and testing of the pulsed power system for the Orion Laser, which will be used for high temperature and density plasma physics research. The system supplies 8 MJ of energy to laser amplifiers and Faraday rotators. It consists of 17 capacitor bank modules, each with up to sixteen 150 μF charge storage capacitors, 25 kV power supply and controls. The energy is delivered by spark-gap switches to give a pre-pulse to ionise the flashlamps and a main pulse of 490 μs. The system delivers 5 shots a day with less than 0.2% variation in charge voltage.
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Development of a Fast Marx Generator for High Power Ultra Wideband Pulse Radiation

64%
Cadilhon B., Pecastaing L., Reess T., de Ferron A., Pignolet P., Brasile J., Andrieu J., Vauchamp S., Bertrand V., Lalande M.
Acta Physica Polonica A
|
2009
|
vol. 115
|
issue 6
1084-1085
EN
We present in this paper the design and realisation of two autonomous, ultra wideband radiation sources consisting of a high gain broadband antenna driven by two subnanosecond pulsed power sources. Each one is made of a Marx generator and a pulse forming device based on the use of gaseous spark gap. The main pulsed source is a ten stage subnanosecond Marx generator which delivers pulses in the range of 250 kV/1.5 J, with a 300 ps rise time, subnanosecond pulse duration at a pulse repetition frequency of 350 Hz. The antenna combined with the pulsed source is a travelling wave antenna called Valentine antenna. Some mechanical modifications were made to improve the dielectric strength of this radiation element. A 3D model of the antenna, on a time domain electromagnetic software, was first performed to study the influence of these modifications on the main radiating characteristics of the antenna. Its high gain and its capability to radiate short pulses without dispersion allow us to achieve a high measured figure of merit.
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