Time resolved visible spectroscopy studies of the plasma sheath evolution in a low energy plasma focus device

15th Latin American Workshop on Plasma Physics; 21st IAEA TM on Research Using Small Fusion Devices

Avaria, G.^1,2 ; Cuadrado, O.^3 ; Moreno, J.^1,2 ; Soto, L.^1,2

Comisión Chilena de Energía Nuclear, Casilla 188-D, Santiago, Chile^1

Center for Research and Application in Plasma Physics and Pulsed Power, P4, Chile^2

Universidad Austral de Chile, Valdivia, Chile^3

关键词: Different stages;    Discharge dynamics;    Ionization degree;    Low energy plasma focus;    Sheath evolution;    Spatial resolution;    Visible spectrometers;    Visible spectroscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/591/1/012024/pdf
DOI  :  10.1088/1742-6596/591/1/012024

来源: IOP

【 摘 要 】

We present the study of the evolution of the ionization degree of the plasma sheath in a low energy plasma focus device with time and spatial resolution, by means of visible spectroscopy. The measurements were developed in the low energy plasma focus device PF-400J (176-539 J, 880 nF, 20-35 kV, quarter period ∼300 ns) [1], using an ANDOR Shamrock 500i visible spectrometer with an ICCD that enabled the acquisition of spectra with time resolution in the order of tens of nanosecond. The use of a lens system improved spatial resolution, allowing the study of the plasma sheath in different stages of the discharge dynamic. In this work we present results from the pinch volume to study the evolution of the ionization degree of the plasma. The results include discharges in pure Hydrogen and a mixture of noble gases and Hydrogen, such as Neon and Helium, which were introduced in the discharge by small percentages ranging from 2 to 5%.