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Nonlinear magnetic reconnection in low collisionality plasmas

Abstract

The magnetic reconnection in collisionless regimes, where electron inertia is responsible for the decoupling of the plasma motion from that of the field lines, is discussed. Since the linear theory of m=1 modes breaks down for very small magnetic island widths, a non linear analysis is called for. Thus, the behaviour of a collisionless, 2-D fluid slab model in the limit {rho}/d -> 0, is analyzed. The main result is that, when the island size is larger than the linear layer but smaller than the equilibrium scale length, the reconnection rate exhibits a quasi-explosive time behaviour, during which a current density sub-layer narrower than the skin depth is formed. It is believed that the inclusion of the electron initial term in Ohm`s law opens the possibility to understand the rapidity of relaxation process observed in low collisionality plasmas. 7 refs., 6 figs.
Authors:
Ottaviani, M; [1]  Porcelli, F [2] 
  1. Commission of the European Communities, Abingdon (United Kingdom). JET Joint Undertaking
  2. Politecnico di Torino, Turin (Italy)
Publication Date:
Jul 01, 1994
Product Type:
Conference
Report Number:
JET-P-94-29; CONF-9406270-
Reference Number:
SCA: 700330; 700340; PA: AIX-28:032667; EDB-97:058916; SN: 97001766252
Resource Relation:
Conference: 21. EPS conference on controlled fusion and plasma physics, Montpellier (France), 27 Jun - 1 Jul 1994; Other Information: PBD: Jul 1994; Related Information: Is Part Of Controlled fusion and plasma physics; PB: 240 p.
Subject:
70 PLASMA PHYSICS AND FUSION; COLLISIONLESS PLASMA; MAGNETIC RECONNECTION; NONLINEAR PROBLEMS; JET TOKAMAK; MAGNETIC FIELD REVERSAL; MAGNETIC ISLANDS; PLASMA SIMULATION
OSTI ID:
456181
Research Organizations:
Commission of the European Communities, Abingdon (United Kingdom). JET Joint Undertaking
Country of Origin:
France
Language:
English
Other Identifying Numbers:
Other: ON: DE97621358; TRN: FR9701768032667
Availability:
INIS; OSTI as DE97621358
Submitting Site:
FRN
Size:
pp. 103-108
Announcement Date:

Citation Formats

Ottaviani, M, and Porcelli, F. Nonlinear magnetic reconnection in low collisionality plasmas. France: N. p., 1994. Web.
Ottaviani, M, & Porcelli, F. Nonlinear magnetic reconnection in low collisionality plasmas. France.
Ottaviani, M, and Porcelli, F. 1994. "Nonlinear magnetic reconnection in low collisionality plasmas." France.
@misc{etde_456181,
title = {Nonlinear magnetic reconnection in low collisionality plasmas}
author = {Ottaviani, M, and Porcelli, F}
abstractNote = {The magnetic reconnection in collisionless regimes, where electron inertia is responsible for the decoupling of the plasma motion from that of the field lines, is discussed. Since the linear theory of m=1 modes breaks down for very small magnetic island widths, a non linear analysis is called for. Thus, the behaviour of a collisionless, 2-D fluid slab model in the limit {rho}/d -> 0, is analyzed. The main result is that, when the island size is larger than the linear layer but smaller than the equilibrium scale length, the reconnection rate exhibits a quasi-explosive time behaviour, during which a current density sub-layer narrower than the skin depth is formed. It is believed that the inclusion of the electron initial term in Ohm`s law opens the possibility to understand the rapidity of relaxation process observed in low collisionality plasmas. 7 refs., 6 figs.}
place = {France}
year = {1994}
month = {Jul}
}