Macroscopic motion of sheath-connected blobs in magnetic fields with arbitrary topology

Stepanenko, A. A.; Lee, W.; Krasheninnikov, S. I.

doi:10.1063/1.4972800

Title: Macroscopic motion of sheath-connected blobs in magnetic fields with arbitrary topology

Journal Article · Tue Jan 03 00:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4972800· OSTI ID:1465390

^[1]; Lee, W. ^[2]; Krasheninnikov, S. I. ^[3]

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow (Russian Federation)
Univ. of California, San Diego, La Jolla, CA (United States)
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow (Russian Federation); Univ. of California, San Diego, La Jolla, CA (United States)

In this study, macroscopic motion of sheath-connected blobs in magnetic fields, having arbitrary topology of the field lines and unfrozen in plasma, is analyzed within the electrostatic limit. Two distinct cases of magnetic configurations, with small and large curvature of the field lines, are considered and the criterion to discern them is deduced. For magnetic configurations with small curvature of the field lines, it is demonstrated that asymmetry of plasma distribution at the blob ends can drive macroscopic motion of a filament due to formation of unequal sheath potentials and establishing the effective Boltzmann potential. For a specific case of magnetic fields with small curvature of the field lines and identical metrics at the sheaths, we show that macroscopic motion of a plasma filament is determined by an effective electrostatic potential, which remains constant in time. For magnetic configurations with large curvature of the field lines, it is shown that motion of sufficiently large blobs is governed by integral distribution of plasma and magnetic field parameters along the field lines leading to blob adjusting its shape and position to the lead of the magnetic field lines in the course of its motion, whereas propagation of small and medium sized blobs can be represented as mutually independent motion of filament transverse cross-sections across the magnetic field lines. In conclusion, the qualitative conclusions on regularities of filament motion are supplied with numerical simulations of blob dynamics in two cases of tokamak-like magnetic fields with sheared and non-sheared field lines.

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Research Organization:: Univ. of California, San Diego, La Jolla, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-04ER54739; FG02-04ER54739 at UCSD

OSTI ID:: 1465390

Alternate ID(s):: OSTI ID: 1361708

Journal Information:: Physics of Plasmas, Vol. 24, Issue 1; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Cited By (6)

Penetration of filamentary structures into the divertor region of spherical tokamaks Baver, D. A.; Myra, J. R. Physics of Plasmas, Vol. 26, Issue 2 https://doi.org/10.1063/1.5065390	journal	February 2019
Interpretation of scrape-off layer profile evolution and first-wall ion flux statistics on JET using a stochastic framework based on fillamentary motion Walkden, N. R.; Wynn, A.; Militello, F. Plasma Physics and Controlled Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1361-6587/aa7365	journal	June 2017
Blob-hole correlation model for edge turbulence and comparisons with NSTX gas puff imaging data Myra, J. R.; Zweben, S. J.; Russell, D. A. Plasma Physics and Controlled Fusion, Vol. 60, Issue 7 https://doi.org/10.1088/1361-6587/aac4fc	journal	June 2018
Edge and divertor plasma: detachment, stability, and plasma-wall interactions Krasheninnikov, S. I.; Kukushkin, A. S.; Lee, Wonjae Nuclear Fusion, Vol. 57, Issue 10 https://doi.org/10.1088/1741-4326/aa6d25	journal	June 2017
Penetration Of Filamentary Structures Into The Divertor Region Of Spherical Tokamaks Baver, Derek A.; Myra, James R. Zenodo https://doi.org/10.5281/zenodo.1453440	text	January 2018
Interpretation of scrape-off layer profile evolution and first-wall ion flux statistics on JET using a stochastic framework based on filamentary motion Walkden, N. R.; Wynn, A.; Militello, F. arXiv https://doi.org/10.48550/arxiv.1706.01239	text	January 2017

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