Self-excited void instability in dusty plasmas: plasma and dust cloud dynamics during the heartbeat instability - Archive ouverte HAL Access content directly
Journal Articles New Journal of Physics Year : 2007

Self-excited void instability in dusty plasmas: plasma and dust cloud dynamics during the heartbeat instability

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Abstract

When a three-dimensional dust cloud is present in a plasma, a dust-free region, called a void, is usually obtained in the plasma centre. Under certain conditions, this region exhibits a self-excited unstable behaviour consisting of successive contractions and expansions of its size. In this paper, this low frequency instability (few Hz), called a ‘heartbeat', is characterised by various diagnostics. Electrical and optical measurements both correlated with high speed imaging brought to the fore the main features of this instability. Forces involved in the void existence are an inward electrostatic force and an outward ion drag one. The force balance ensures an open void but this equilibrium can be disturbed, leading to the observed instabilities. As these forces are strongly dependent on local ionisation conditions, correlations between physical processes in the plasma volume and the dust cloud motion are investigated through experimental results.
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Dates and versions

hal-00187304 , version 1 (14-11-2007)

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Maxime Mikikian, Lénaïc Couëdel, Marjorie Cavarroc, Yves Tessier, Laifa Boufendi. Self-excited void instability in dusty plasmas: plasma and dust cloud dynamics during the heartbeat instability. New Journal of Physics, 2007, 9, pp.268. ⟨10.1088/1367-2630/9/8/268⟩. ⟨hal-00187304⟩
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