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Author(s):
K. Ohi, H. Naitou, Y. Tauchi, O. Fukumasa
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Title:
Bifurcation in Asymmetric Plasma Divided by a Magnetic Filter
Date of publication:
May 2001
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Key words:
magnetic filter, shock wave, limit cycle, PIC code, bifurcation, positive feedback, autonomous oscillation
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Abstract:
A magnetic filter (MF) reflecting electrons from both sides can separate a low-temperature and low-density subplasma from a high-temperature and high-density main plasma. The one-dimensional numerical simulation by the particle-in-cell code revealed that, depending on the asymmetry, the plasma divided by the MF behaves dynamically or statically [K. Ohi et al., Physics of Plasmas 8, 23 (2001)]. The transition between the two bifurcated states is discontinuous. In the dynamic state, the autonomous potential oscillation in the subplasma is synchronized with the passage of the shock wave structure generated by the modulated ion beam from the main plasma. The stationary phase of the dynamic state appears after the amplitude of the potential oscillation in the subplasma grows exponentially from the thermal noise. In the static state, the system is stable to the growth of the potential oscillation in the subplasma.
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