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Spontaneous three-dimensional magnetic reconnection in merging toroidal plasma experiment
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10.1063/1.4774403
/content/aip/journal/pop/20/1/10.1063/1.4774403
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/1/10.1063/1.4774403
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Cross-sectional view (r-z: left, r- : right) of the TS-4 device and experimental setup of two types of 2D magnetic probe arrays: (i) a 10(r) × 9(z) × 2 channel array for and measurement along the r-z plane, and (ii) a channel array on the midplane for toroidal modes measurement (n = 0–3).

Image of FIG. 2.
FIG. 2.

Poloidal flux contours , toroidal current density in the r-z plane, and the axial magnetic field contours along the r- plane on the midplane for two merging toroids with a high guide field value of under (a) weak ( ) and (b) strong ( ) compression forces and those with a low guide field value of under (c) the weak and (d) the strong compression forces. Here, and are measured when the common flux ratio .

Image of FIG. 3.
FIG. 3.

Time evolutions of n = 1–3 toroidal mode amplitudes normalized by the n = 0 component (the left ordinate) and itself (the right ordinate) on the midplane at (a) r = 444 mm, (b) r = 351 mm, and (c) r = 307 mm, respectively, when the two toroids with the field value of merge together under (1) the weak ( ) and (2) strong ( ) compression forces.

Image of FIG. 4.
FIG. 4.

Time evolutions of the toroidal asymmetry of the reconnected poloidal fluxes at the four toroidal positions , and on the midplane during the magnetic reconnection and their standard deviations for two merging toroids with (a) the high guide field value of and (b) the low guide field value of under the strong compression force of .

Image of FIG. 5.
FIG. 5.

Radial profiles of toroidal asymmetry of the axial magnetic field normalized by the peak axisymmetric field component on the midplane measured at four toroidal positions , and for two merging toroids with the high guide field value of and those with the low guide field value of under the strong compression force .

Image of FIG. 6.
FIG. 6.

(a) Toroidal asymmetry of the axial magnetic field normalized by the axisymmetric field component and (b) reconnection rate as a function of the external vacuum poloidal magnetic pressure at the X point when excited by an acceleration coil current for two merging toroids for five different values of .

Image of FIG. 7.
FIG. 7.

Dependence of reconnection rate on toroidal asymmetry of the axial magnetic field normalized by the axisymmetric field component for two merging toroids for five different guide fields.

Image of FIG. 8.
FIG. 8.

Time evolutions of (a) inflow and outflow fluxes , (b) reconnection toroidal electric field at the X point and peak toroidal current density of the current sheet, and (c) its effective resistivity at the X point, respectively, when the two toroids with the field value of merge together under (1) the weak ( ) and (2) strong ( ) compression forces. The classical resistivity is drawn as a reference.

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/content/aip/journal/pop/20/1/10.1063/1.4774403
2013-01-10
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spontaneous three-dimensional magnetic reconnection in merging toroidal plasma experiment
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/1/10.1063/1.4774403
10.1063/1.4774403
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