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Magnetic field structure evolution in rotating magnetic field plasmas
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10.1063/1.2952293
/content/aip/journal/pop/15/7/10.1063/1.2952293
http://aip.metastore.ingenta.com/content/aip/journal/pop/15/7/10.1063/1.2952293
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The schematic of the cylindrical chamber rotamak.

Image of FIG. 2.
FIG. 2.

Time history of the plasma current when a small current is applied to middle coil during rotamak-FRC plasma discharges. The data from 15 shots is plotted to show the reproducibility of discharges. Current in the middle coil is also shown; the negative sign corresponds to the direction opposite to plasma current.

Image of FIG. 3.
FIG. 3.

Magnetic field and plasma current density during startup stage. The magnetic field is measured with pickup coils and interpolated to a finer grid.

Image of FIG. 4.
FIG. 4.

Magnetic field and plasma current density before the current in the middle coil is started , and when it is started and reaches at .

Image of FIG. 5.
FIG. 5.

Axial magnetic field and poloidal flux at the chamber wall before (thin lines) and after (bold lines) the middle coil is energized. Dashed lines show the vacuum field at the chamber wall produced by the vertical field coil alone and together with middle coil.

Image of FIG. 6.
FIG. 6.

Profiles of the plasma current density along chord in FRC regime, when the current in the middle coil is zero , and when it reaches .

Image of FIG. 7.
FIG. 7.

Time history of plasma current (15 shots are plotted) when a large current is applied to the middle coil during rotamak-FRC plasma discharges. Current in the middle coil is also shown.

Image of FIG. 8.
FIG. 8.

Magnetic field and plasma current density; current in the middle coil is started at , reaches disruptive level of at , then continues to grow up to at .

Image of FIG. 9.
FIG. 9.

Profiles of the plasma current density along chord, when the current in the middle coil is just started , reaches disruptive level of , and then further grows to when the total plasma current is nearly zero.

Image of FIG. 10.
FIG. 10.

Time history of plasma current (15 shots are plotted) when a small current is applied to the middle coil during rotamak-ST plasma discharges. Current in the middle coil is also shown; the negative sign corresponds to the direction opposite to plasma current.

Image of FIG. 11.
FIG. 11.

Magnetic field and plasma current density during startup stage in the ST regime.

Image of FIG. 12.
FIG. 12.

Magnetic field and plasma current density before the current in the middle coil is started , and when it is started and reaches at .

Image of FIG. 13.
FIG. 13.

Axial magnetic field and poloidal flux at the chamber wall before (thin lines) and after (bold lines) the middle coil is energized. Dashed lines show the vacuum field at the chamber wall produced by the vertical field coil alone and together with middle coil.

Image of FIG. 14.
FIG. 14.

Profiles of the plasma current density along chord in ST regime, when the current in the middle coil is zero , and when it reaches .

Image of FIG. 15.
FIG. 15.

The change of the magnetic axis position during plasma shot. The time history of current in the middle coil is shown by the dashed line.

Image of FIG. 16.
FIG. 16.

The magnetic axis position as a function of the middle-coil field magnitude.

Image of FIG. 17.
FIG. 17.

Time history of plasma current (15 shots are plotted) when a large current is applied to the middle coil during rotamak-ST plasma discharges. Current in the middle coil is also shown; the negative sign corresponds to direction opposite to plasma current.

Image of FIG. 18.
FIG. 18.

Magnetic field and plasma current density; current in the middle coil is started at , and reaches the disruptive level at ; see Fig. 17.

Image of FIG. 19.
FIG. 19.

Profiles of the plasma current density along chord, when the current in the middle coil is just started , reaches disruptive level of , and then further grows to when the total plasma current is reduced.

Image of FIG. 20.
FIG. 20.

The magnetic axis position as a function of the middle-coil field magnitude.

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/content/aip/journal/pop/15/7/10.1063/1.2952293
2008-07-15
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic field structure evolution in rotating magnetic field plasmas
http://aip.metastore.ingenta.com/content/aip/journal/pop/15/7/10.1063/1.2952293
10.1063/1.2952293
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