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Drift-Alfven waves induced optical emission fluctuations in Aditya tokamak
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10.1063/1.3461165
/content/aip/journal/pop/17/7/10.1063/1.3461165
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/7/10.1063/1.3461165
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the sets of Langmuir probes.

Image of FIG. 2.
FIG. 2.

Schematic of the optical viewing geometry and the line-of-sights.

Image of FIG. 3.
FIG. 3.

The time evolution of a typical plasma discharges in Aditya tokamak. (a) Plasma current, (b) loop voltage, (c) chord-averaged central density, and (d) intensity measured with slow sampling rate.

Image of FIG. 4.
FIG. 4.

Comparison of two Aditya discharges, (a) shot 14592 with less MHD activity and (b) shot 14598 with high MHD activity; (i) plasma current and loop voltage, (ii) fluctuations in the time derivative of the poloidal magnetic field, , and (iii) fluctuations in the intensity, measured with high sampling rate.

Image of FIG. 5.
FIG. 5.

Comparison the spectral properties of Mirnov, intensity, and intensity fluctuations for shot 14592 with less MHD activity and for shot 14598 with high MHD activity; [(a), (b), and (c)] spectral properties of Mirnov, intensity, and intensity fluctuations for shot 14592, respectively; [(d), (e), and (f)] spectral properties of Mirnov, intensity, and intensity fluctuations for shot 14598, respectively.

Image of FIG. 6.
FIG. 6.

Comparison the spectral properties of floating potential and density fluctuations for shot 14592 with less MHD activity and for shot 14598 with high MHD activity; (a) spectral properties of floating potential, (b) density fluctuations measured by Langmuir probes, (c) density fluctuation measured by microwave interferometry for shot 14592; (d) spectral properties of floating potential, (e) density fluctuations measured by Langmuir probes, (f) density fluctuation measured by microwave interferometry for shot 14598.

Image of FIG. 7.
FIG. 7.

Coherence spectra of (a) poloidal magnetic fluctuations and the fluctuations and (b) poloidal magnetic fluctuations and the density fluctuations measured with microwave interferometry.

Image of FIG. 8.
FIG. 8.

The (a) density, (b) floating potential, and (c) magnetic fluctuations in the frequency range of 7–10 kHz for shot 14598 with high MHD activity.

Image of FIG. 9.
FIG. 9.

(a) Density fluctuations of 6–8 kHz measured by set of poloidally separated Langmuir probes shown in Fig. 1(a) , probe 2—solid line, probe 4—dashed line, probe 6—dotted line, and probe 8—dashed-dotted line. (b) The normalized value of density fluctuations [from Fig. 9(a) ] at one time instant (squares) as a function of position and fitted sine curve (solid line) to the points.

Image of FIG. 10.
FIG. 10.

The density, magnetic and fluctuations respectively in a discharge (shot 19736) in which neutral hydrogen is puffed around .

Image of FIG. 11.
FIG. 11.

The frequency spectrum of (a) density, (b) magnetic, and (c) fluctuations, respectively, for shot 19736 in three time windows; prior to the gas puff, 44–53 ms (solid line); during the presence of gas puff, 53–60 ms (dashed line); after the effect of gas puff is gone, 60–70 ms (solid line) (neutral hydrogen is puffed around ).

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/content/aip/journal/pop/17/7/10.1063/1.3461165
2010-07-29
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Drift-Alfven waves induced optical emission fluctuations in Aditya tokamak
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/7/10.1063/1.3461165
10.1063/1.3461165
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