title: Fast resistive reconnection regime in the nonlinear evolution of double tearing modes.
abstract: Phases of nonlinear double tearing modes are studied numerically. The first two phases lead to the formation and growth of magnetic islands and are followed by a fast reconnection phase to complete the process, driven by a process of neighboring magnetic separatrices merging and magnetic islands coupling. The fast growth can be understood as a result of the island interaction equivalent to a steadily inward flux boundary driven. Resistivity dependences for various phases are studied and shown by scaling analysis for the first time. It is found that after an early Sweet-Parker phase with a eta(1/2)-scale, a slow nonlinear phase in a Rutherford regime with a eta(1)-scale is followed by the fast reconnection phase with a eta(1/5)-scale.
authors.affiliation: State Key Lab of Materials Modifications by Beams, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, China 116024.
authors.forename: Z X
authors.initials: ZX
authors.lastname: Wang
authors.forename: X G
authors.initials: XG
authors.lastname: Wang
authors.forename: J Q
authors.initials: JQ
authors.lastname: Dong
authors.forename: Y A
authors.initials: YA
authors.lastname: Lei
authors.forename: Y X
authors.initials: YX
authors.lastname: Long
authors.forename: Z Z
authors.initials: ZZ
authors.lastname: Mou
authors.forename: W X
authors.initials: WX
authors.lastname: Qu