The electron forewake: Shadowing and drift-energization as flowing magnetized plasma encounters an obstacle

Haakonsen, Christian Bernt; Hutchinson, Ian H.

doi:10.1063/1.4932006

Title: The electron forewake: Shadowing and drift-energization as flowing magnetized plasma encounters an obstacle

Journal Article · Thu Oct 08 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4932006· OSTI ID:1469378

^[1]; Hutchinson, Ian H. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Flow of magnetized plasma past an obstacle creates a traditional wake, but also a forewake region arising from shadowing of electrons. The electron forewakes resulting from supersonic flows past insulating and floating-potential obstacles are explored with 2D electrostatic particle-in-cell simula-tions, using a physical ion to electron mass ratio. Drift-energization is discovered to give rise to modifications to the electron velocity-distribution, including a slope-reversal, providing a novel drive of forewake instability. The slope-reversal is present at certain locations in all the simula-tions, and appears to be quite robustly generated. Wings of enhanced electron density are observed in some of the simulations, also associated with drift-energization. In the simulations with a floating-potential obstacle, the specific potential structure behind that obstacle allows fast electrons to cross the wake, giving rise to a more traditional shadowing-driven two-stream instability. In conclusion, fluctuations associated with such instability are observed in the simulations, but this instability-mechanism is expected to be more sensitive to the plasma parameters than that associated with the slope-reversal.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0010491

OSTI ID:: 1469378

Alternate ID(s):: OSTI ID: 1223158

Journal Information:: Physics of Plasmas, Vol. 22, Issue 10; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Wake effects of a stationary charged grain in streaming magnetized ions Sundar, Sita Physical Review E, Vol. 98, Issue 2 https://doi.org/10.1103/physreve.98.023206	journal	August 2018
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