Influence of neutral pressure on instability enhanced friction and ion velocities at the sheath edge of two-ion-species plasmas

Adrian, P. J.; Baalrud, S. D.; Lafleur, T.

doi:10.1063/1.4986239

Title: Influence of neutral pressure on instability enhanced friction and ion velocities at the sheath edge of two-ion-species plasmas

Journal Article · Mon Dec 11 00:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4986239· OSTI ID:1514856

Adrian, P. J. ^[1]; Baalrud, S. D. ^[1]; Lafleur, T. ^[2]

Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
Ecole Polytechnique, Palaiseau (France). Laboratoire de Physique des Plasmas; Sorbonne Univ., Paris (France)

The Instability Enhanced Friction theory [Baalrud et al., Phys. Rev. Lett. 103, 205002 (2009)] is extended to account for the influence of neutral pressure in predicting the flow speed of each ion species at the sheath edge of plasmas containing two ion species. Particle-in-cell simulations show that the theory accurately predicts both the neutral pressure cutoff of ion-ion two-stream instabilities and the ion flow speeds at the sheath edge as pressure is varied over several orders of magnitude. The simulations are used to directly calculate the instability-enhanced ion-ion friction force. Finally, at sufficiently high neutral pressure, the simulations also provide evidence for collisional modifications to the Bohm criterion

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Research Organization:: Univ. of Iowa, Iowa City, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0016473

OSTI ID:: 1514856

Alternate ID(s):: OSTI ID: 1412617

Journal Information:: Physics of Plasmas, Vol. 24, Issue 12; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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