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Measurement of reflux ions in the target area of the Shenlong-1 Bremsstrahlung target

2013-09-18
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The strong current and high power pulsed electron beam generated by the Shenlong-1 linear induction accelerator (LIA) can produce high doses of X-rays after interacting with the X-ray conversion target. At the same time, due to the ablation of the conversion target, reflux ions are generated on the target surface. The existence of the reflux ions affects the focusing of the electron beam. Four sets of Faraday cages and their corresponding bias circuits were designed. The Faraday cages were placed at different positions upstream of the Shenlong-1 X-ray conversion target and distributed on both sides of the electron beam axis. The maximum bias voltage of the circuit design was 1 kV. The reflux ions generated on the X-ray conversion target surface of the Shenlong-1 LIA were experimentally measured, and the reflux positive ion density was about 1021/m3, and the ion movement speed could reach 2-3 mm/s. The calculation comparison shows that the ion current intensity is very different from the electron beam current before the Shenlong-1 target, which is only 0.27% of the electron beam current intensity, and will not affect the focusing of the Shenlong-1 electron beam.

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