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High non-inductive fraction H-mode discharges generated by high-harmonic fast wave heating and current drive in the National Spherical Torus Experiment
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10.1063/1.3699364
/content/aip/journal/pop/19/4/10.1063/1.3699364
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/4/10.1063/1.3699364
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Time evolution of an HHFW-generated H-mode plasma (shot 138498) that did notmaintain good HHFW coupling to the core during the H-mode phase. (a) Line integrated density (), central electron temperature (), and total plasma stored energy () versus time. (b) Outer gap between the last closed flux surface and the front of the HHFW antenna on the midplane and RF power versus time. (c) The time evolution of the measured loop voltage. (d) Electron density and (e) electron temperature versus major radius at three times during shot 138498; 0.165 s (dashed line), 0.282 s (thin solid line), and 0.382 s (thick solid line).

Image of FIG. 2.
FIG. 2.

(a) and at 0.282 s, near the time of peaked and , for shot 138498. (b) genray-adj ray trajectories plotted on a poloidal cross section for shot 138498 at 0.282 s, each ray is followed until 99% of the power is absorbed. (c) genray-adj RF power deposition (solid line) and RF-driven current (dashed line) versus r/a at 0.282 s for shot 138498.

Image of FIG. 3.
FIG. 3.

Ip (thick solid black line), bootstrap current (IBS , thin solid black line), and RF-driven current (IFWCD , dashed line), calculated by transp-toric, and PRF (thick solid grey line) plotted as a function of time for shot 138498.

Image of FIG. 4.
FIG. 4.

Time evolution of an HHFW-generated H-mode plasma (shot 138506) that maintained good HHFW coupling to the core during the H-mode phase. (a) Line integrated density (), central electron temperature (), and total plasma stored energy () versus time. (b) Outer gap between the last closed flux surface and the front of the HHFW antenna on the midplane and RF power versus time. (c) The time evolution of the measured loop voltage. (d) Electron density and (e) electron temperature versus major radius at four times during shot 138506; 0.165 s (dashed line), 0.282 s (thin solid black line), 0.298 s (thick solid grey line), and 0.382 s (thick solid black line).

Image of FIG. 5.
FIG. 5.

(a) and at 0.382 s, near the time of peaked and , for shot 138506. (b) genray-adj ray trajectories plotted on a poloidal cross section for shot 138506 at 0.382 s, each ray is followed until 99% of the power is absorbed. (c) genray-adj RF power deposition (solid line) and RF-driven current (dashed line) versus r/a at 0.382 s for shot 138506.

Image of FIG. 6.
FIG. 6.

(a) Ip (thick solid line), IBS (thin solid line) and IFWCD (dashed line) calculated by transp-toric for shot 138506, and the RF power (Gray shading) plotted versus time. (b) Contour plot of the plasma pressure calculated by transp-toric plotted versus r/a and time for shot 138506. Contours are plotted in kPa increments. (c) Area integrated current versus r/a calculated by transp-toric at 0.382 s, including Ip (thick solid line), IBSCD (thin solid line) and the IFWCD (thin black line). The location of the internal transport barrier (ITB) is indicated by the shaded region near r/a = 0.4.

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/content/aip/journal/pop/19/4/10.1063/1.3699364
2012-04-04
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High non-inductive fraction H-mode discharges generated by high-harmonic fast wave heating and current drive in the National Spherical Torus Experiment
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/4/10.1063/1.3699364
10.1063/1.3699364
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