Studies of Plasma Dynamics in a Small Plasma Focus Operating in Hydrogen-Argon Mixtures |
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| Authors: | M Favre P Silva H Chuaqui E Wyndham P Choi C Dumitrescu-Zoita |
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| Institution: | (1) Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile;(2) LPMI, Ecole Polytechnique, Palaiseau, 91128, France |
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| Abstract: | We report on experimental observations in PFP-I, a small 3.8 kJ plasma focus, which is operated in Hydrogen-Argon mixtures to investigate the effect of parameter modifications on the overall performance of the device. An extensive array of diagnostics is been used, which includes voltage and current probes in the external circuit, a novel small magnetic probes array located along the cathode rods, filtered PIN diodes located side and end on, and filtered multi-pinhole and slit-wire X-ray camera. Extended operating range from below 0.2 Torr upwards has been achieved. Hot spot formation has been investigated as a function of H2-Ar mixing ratio. Hot spot sizes around 150  m in the soft X-ray region, have been inferred from the slit-wire measurements. Pin-hole time integrated X-ray pictures and time resolved PIN diode measurements have been used to determine characteristic hot-spot temperatures in the 350 to 450 eV range. |
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