Document Type : Research Paper
Authors
1 هیات علمی پژوهشگاه
2 پژوهشکده گداخت
3 Plasma Physics and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute, P.O. Box 14155-1339, Tehran, Iran
Abstract
The effect of pre-ionization using a 330 MΩ shunt resistor on the performance characteristics of a Mather Type plasma focus device with 2.4 kJ energy, which is charged by a 12 μF capacitor bank to a maximum voltage of 20 kV, will be presented for hydrogen gas. In this work, the signal characteristics of the current and the current derivative of the device were measured and compared without pre-ionization and with pre-ionization at an optimal operational pressure of 0.85 Torr. In addition, the emitted hard X-ray and the emitted ion beam in each shot were measured using a Ne102 X-ray plastic scintillation detector and Faraday cup, respectively. These measurements are performed and compared in the presence and absence of pre-ionization at the optimal pressure. The results obtained from the current and the current derivative signals of the device show that in the presence of the initial pre-ionization, the signals are associated with a deeper and sharper fracture, at the pinch time, compared to the circumstances where the pre-ionization circuit is not active. This means that a stronger and more explicit pinch, in the presence of the pre-ionization, is performed compared to when the pre-ionization circuit is inactive. On the other hand, analysis of the Faraday cup signal amplitudes shows that the intensity of the emitted hard X-ray is noticeably higher when the device uses pre-ionization than when the device does not have a pre-ionization circuit.
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