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Stable spheromak formation by merging in an oblate flux conserver
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10.1063/1.3334324
/content/aip/journal/pop/17/3/10.1063/1.3334324
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/3/10.1063/1.3334324
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The conical oblate flux conserver and a calculated spheromak equilibrium are shown in the SSX vacuum vessel. The poloidal field of the equilibrium is represented by vectors, while the contours represent flux surfaces. The quartz-clad magnetic probes are also indicated.

Image of FIG. 2.
FIG. 2.

Magnetic data. The probe displayed in the top left of each figure is installed at , while the probe shown in lower left is at . (a) is early in the discharge during the merging phase at . It is clear that this phase is dynamic and nonaxisymmetric. Later in the discharge at , shown in (b), the merging has resulted in an axisymmetric spheromak.

Image of FIG. 3.
FIG. 3.

Magnetic data from the tilted mode. Orientation is the same as in Fig. 2. Much like fields from the axisymmetric state, the fields are very dynamic early in time. Later in time, they settle down into the tilted configuration shown, with the geometric axis of the spheromak aligned with the probe located at 315°.

Image of FIG. 4.
FIG. 4.

Typical plasma temperatures and densities for the cohelicity merged object. Note the time scales are not the same. In (a), a typical line integrated density is shown. In the main region of the discharge , densities of are seen. (b) shows the ion temperature as measured by the IDS system, averaged over 16 shots. While there is an initial spike in during the merging phase of the discharge , decays slowly. The error bars represent the spread in the temperatures of the 16 shots.

Image of FIG. 5.
FIG. 5.

Volume averaged beta for the merged object. The range of displayed corresponds . After merging is completed around , settles to a value of 0.2–0.3.

Image of FIG. 6.
FIG. 6.

The lowest eigenstate for Taylor relaxation in the oblate flux conserver in SSX, generated by the PSI-TET code. In (a), the flux conserver geometry is represented by the gray transparent solid, while the streamlines illustrate the magnetic fields, showing the overall structure of the state. Color represents . Magnetic field vectors are displayed in [(b) and (c)] with the poloidal field shown in (b) and the toroidal field in (c) compared with the measured field in Fig. 2(b).

Image of FIG. 7.
FIG. 7.

profile for the axisymmetric state. The profile is flat. The calculated value from PSI-TET is marked by the dashed line with a value of . The large error bar for the point at is due to the very small value of at that location.

Image of FIG. 8.
FIG. 8.

The time evolution of for the axisymmetric state. The calculated value for the geometry is marked by the dashed line with a value of . The plasma is in the relaxed state during the period at .

Image of FIG. 9.
FIG. 9.

The second eigenstate for Taylor relaxation in the oblate flux conserver in SSX, generated by the PSI-TET code. This is a tilted mode. In a, the flux conserver geometry is represented by the gray transparent solid, while the streamlines illustrate the magnetic fields, showing the overall structure of the state. Color represents . Magnetic field vectors are displayed in [(b) and (c)] with the poloidal field shown in (b) and the toroidal field in (c) compared with the measured field in Fig. 3.

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/content/aip/journal/pop/17/3/10.1063/1.3334324
2010-03-29
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stable spheromak formation by merging in an oblate flux conserver
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/3/10.1063/1.3334324
10.1063/1.3334324
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