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Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmasa)
a)Paper NI2 6, Bull. Am. Phys. Soc. 56, 184 (2011).
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10.1063/1.3695213
/content/aip/journal/pop/19/5/10.1063/1.3695213
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/5/10.1063/1.3695213
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The energy confinement time (from kinetic profiles) as a function of average electron density for a series of 5.2 T, 0.81 MA Ohmic discharges. The shaded vertical bar indicates the boundary between the LOC and SOC regimes. The dashed line is the neo-Alcator scaling, the solid line is the best fit to the low density points, and the dash-dot line is the ITER-89 P L-mode scaling.

Image of FIG. 2.
FIG. 2.

The energy confinement times from magnetics (top) and the core toroidal rotation velocities (bottom) as a function of line averaged electron density for 5.2 T discharges with plasma currents of 0.62 MA (left) and 1.0 MA (right). The vertical dashed lines indicate the locations of the co- to counter-current rotation boundaries.

Image of FIG. 3.
FIG. 3.

The transition density between the LOC and SOC regimes (top) and the critical density for core toroidal rotation reversals (bottom) as a function of plasma current for fixed magnetic field. The dotted lines have the same slope. The dashed line is an empirical scaling.3

Image of FIG. 4.
FIG. 4.

The electron and ion temperatures (top), their ratio (second frame), effective Z (third frame), and inverse density gradient scale length (bottom) at r/a = 0.6 (R = 0.80 m) as a function of electron density for 0.62 MA, 5.2 T discharges. The dotted vertical line indicates the LOC/SOC transition density.

Image of FIG. 5.
FIG. 5.

The core toroidal rotation velocities as a function of for plasma currents of 0.62 MA (top) and 1.0 MA (bottom). Vertical lines indicate the co- to counter-current rotation boundary.

Image of FIG. 6.
FIG. 6.

The core toroidal rotation velocities as a function of for plasma currents of 0.62 MA (top) and 1.0 MA (bottom). Vertical lines indicate the co- to counter-current rotation boundary.

Image of FIG. 7.
FIG. 7.

The transition density from LOC to SOC as a function of major radius for different devices at fixed values of q. The solid curve represents 1/R.

Image of FIG. 8.
FIG. 8.

The ratio Zeff/ as a function of density for the 5.2 T, 0.62 MA discharges of Fig. 4, in the vicinity of the LOC-SOC transition point.

Image of FIG. 9.
FIG. 9.

The electron density (top), plasma current (middle), and core rotation velocity (bottom) for a 6.3 T discharge with downward current ramps.

Image of FIG. 10.
FIG. 10.

The core rotation velocity as a function of plasma current at fixed magnetic field and electron density. The solid line is the best linear fit.

Image of FIG. 11.
FIG. 11.

Time histories of the electron density (top), toroidal magnetic field (middle), and core rotation velocity (bottom) in a 0.8 MA plasma with a downward magnetic field ramp.

Image of FIG. 12.
FIG. 12.

The core toroidal rotation velocity as a function of toroidal magnetic field at fixed plasma current and electron density.

Image of FIG. 13.
FIG. 13.

The density fluctuation spectrum S(k,f) of the difference between dispersion plots taken at two times during a 5.2 T, 1.0 MA discharge.

Image of FIG. 14.
FIG. 14.

Contour plots of the linear growth rates (in units of c s /a) of the most unstable modes (with 0.25 <  0.75) in the a/L n -a/L T plane, for r/a = 0.6. The + signs indicate the operational point of discharges with n e  = 0.3 × 1020/m3 (left) and 1.2 × 1020/m3 (right).

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2012-03-26
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmasa)
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/5/10.1063/1.3695213
10.1063/1.3695213
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