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Magnetic reconnection is a plasma phenomenon where a topologicalrearrangement of magnetic field lines with opposite polarity results indissipation of magnetic energy into heat, kinetic energy and particleacceleration. Such a phenomenon is considered as an efficient mechanism forenergy release in laboratory and astrophysical plasmas. An important questionis how to make the process fast enough to account for observed explosive energyreleases. The classical model for steady state magnetic reconnection predictsreconnection times scaling as $S^{1/2}$ (where $S$ is the Lundquist number) andyields times scales several order of magnitude larger than the observed ones.Earlier two-dimensional MHD simulations showed that for large Lundquist numberthe reconnection time becomes independent of $S$ ("fast reconnection" regime)due to the presence of the secondary tearing instability that takes place for$S \gtrsim 1 \times 10^4$. We report on our 3D MHD simulations of magneticreconnection in a magnetically confined cylindrical plasma column under eithera pressure balanced or a force-free equilibrium and compare the results with 2Dsimulations of a circular current sheet. We find that the 3D instabilitiesacting on these configurations result in a fragmentation of the initial currentsheet in small filaments, leading to enhanced dissipation rate that becomesindependent of the Lundquist number already at $S \simeq 1\times 10^3$.

MHD simulations of three-dimensional Resistive Reconnection in a cylindrical plasma column