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Title: Plasmoid instability in the semi-collisional regime

Journal Article · · Journal of Plasma Physics
 [1];  [1]
  1. Massachusetts Institute of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

Here, we investigate analytically and numerically the semi-collisional regime of the plasmoid instability, defined by the inequality $$δ_{SP} \gg ρ_s \gg δ_{in}$$, where $$δ_{SP}$$ is the width of a Sweet–Parker current sheet, $$ρ_s$$ is the ion sound Larmor radius and $$δ_{in}$$ is the width of the boundary layer that arises in the plasmoid instability analysis. Theoretically, this regime is predicted to exist if the Lundquist number S and the length of the current sheet L are such that ($$L/ρ_s$$)14/9 < S < ($$L/ρ_s$$)2 (for a sinusoidal-like magnetic configuration; for a Harris-type sheet the lower bound is replaced with ($$L/ρ_s$$)8/5). These bounds are validated numerically by means of simulations using a reduced gyrokinetic model conducted with the code Viriato. Importantly, this regime is conjectured to allow for plasmoid formation at relatively low, experimentally accessible, values of the Lundquist number. Our simulations obtain plasmoid instability at values of S as low as ~250. The simulations do not prescribe a Sweet–Parker sheet; rather, one is formed self-consistently during the nonlinear evolution of the initial tearing mode configuration. This proves that this regime of the plasmoid instability is realizable, at least at the relatively low values of the Lundquist number that are accessible to current dedicated experiments.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)
Grant/Contract Number:
FG02-91ER54109; SC0016215
OSTI ID:
1610188
Journal Information:
Journal of Plasma Physics, Vol. 84, Issue 6; ISSN 0022-3778
Publisher:
Cambridge University PressCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Cited By (2)

Influence of 3D plasmoid dynamics on the transition from collisional to kinetic reconnection journal July 2019
Interactions of magnetized plasma flows in pulsed-power driven experiments text January 2019