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Low-frequency (ω ω pi ) plasma oscillations in the transition regime between the high and the low current mode of a thermionic hot-cathode discharge are investigated experimentally. This type of current oscillation often shows chaotic dynamics. The current oscillations are related to nonlinear short wavelength potential structures which are identified as ion bunches formed by a fluctuating...
The oscillations of the ion sheath around a negatively biased grid in dp machines are studied experimentally and compared with PIC simulations. It is argued that for asymmetric densities in the source and target chamber the ion sheath on the low density side becomes unstable to virtual anode oscillations which act as a driver for the ion bounce oscillations in the sheath. Resonant coupling with...
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