631.374.2 N. V. Zharova, N. A. Zhidkova, S. A. Chaikovskii, and V. I. OreshkinRadiography of short-living objects using X-pinch radiation is a new perspective direction in diagnostics developed at the P. N. Lebedev Institute of Physics. High spatial (up to a few tenth of a micrometer) and temporal resolutions (up to 0.1 ns) achieved with the use of the X pinch is extremely interesting to the researches of transient processes and substances in extreme states. The X pinch is produced by two or more crossed wires (with wire diameters up to 30 µm) exploded under the influence of current running through them. Scanning radiation is generated in a dense high-temperature plasma (up to several kiloelectron volts) arising in the region of wire crossing. Among the main requirements on the generator used to create the X pinch are current amplitudes of 150-300 kA and rates of current increase of 1-2 kA/ns. Up to now, these current pulse parameters have been provided only by bulky stationary generators weighing from 300 kg to several tons. In the present paper, a small-size (weighing 70 kg) high-current pulse generator (with current amplitude exceeding 300 kA and pulse rise time of 200 ns) of soft x-ray radiation from high-temperature X-pinch plasma is described.
The efficiency of the X ray point projection radiography technique has been demonstrated on a terawatt pulse power generator using a detached compact current generator driving an X pinch load. This technique has been approved in an experiment on the multiwire array implosion performed at the Angara 5 1 generator with a peak power as high as 6 TW. The advantage of this experiment over earlier experiments on terawatt generators is in the use of a separate X pinch driver, which makes it possible to arbitrarily vary the sample probing time. The X pinch driver is connected to the load unit by means of a flexible low inductance transmission line. The flexibility of the transmission line is an additional advantage of this technique, since it allows the accuracy of the X ray radiography system adjustment to be improved and the X pinch to be located near the plasma load. When compared to the laser method for producing a probe radiation source, the pro posed technique features a smaller size, a lower cost of the facility, the absence of high price optical elements, and a higher efficiency of X ray generation. Owing to the small size of the synchronized X pinch driver, it can be transported for use in experiments performed at other research organizations.
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