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Hard x-ray correlation analysis as a diagnostic tool for the measurement of magnetic turbulence in tokamaks
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10.1063/1.3516043
/content/aip/journal/rsi/81/12/10.1063/1.3516043
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/12/10.1063/1.3516043
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The arrangement of diagnostics around the torus and the shielding for the HXR detectors are shown. The “field of view” looked at by the HXR detector in the cross-section C–C is shown.

Image of FIG. 2.
FIG. 2.

The HXR intensities with the detectors’ entrance aperture open (a) and closed (b). The same signals are shown in (c) and (d), respectively, expanded from 10.2 to 10.6 ms. The ordinates are in the same units (a.u.). The pulses and their widths in (c) are more distinct.

Image of FIG. 3.
FIG. 3.

A typical plasma discharge characteristics: plasma current and loop voltage (a), horizontal plasma shift (b), soft x-ray emissivity through a central chord (c), core hard x-ray emissivity (d), limiter hard x-ray emissivity (e), and magnetic loop pickup signal (f) waveforms.

Image of FIG. 4.
FIG. 4.

Frequency spectra of the limiter hard x-ray, core hard x-ray, and magnetic signal for three time windows corresponding to different regions of stochasticity. Note the widely different scales.

Image of FIG. 5.
FIG. 5.

The expanded view of the core (dotted) and the limiter (solid line) hard x-ray wave forms in (a) the coherent phase and (b) the incoherent phase.

Image of FIG. 6.
FIG. 6.

Cross-correlation functions of the core and the limiter hard x-ray signals in (a) the coherent phase and (b) the incoherent phase.

Image of FIG. 7.
FIG. 7.

The autocorrelation functions of (a) the limiter hard x-ray, (b) the core hard x-ray, and (c) the magnetic signal wave forms in the (left) coherent and (right) incoherent phases.

Image of FIG. 8.
FIG. 8.

The scatter plot of the relationship between the radial diffusion coefficient (ordinate, calculated from the cross-correlation times of the core and the limiter x-ray wave forms) with (plotted as abscissa) autocorrelation times of limiter HXR (solid inverted red triangle), core HXR (solid green triangle), and the signals (blue hollow square) and the reciprocal of the spectral bandwidth of the same magnetic pick up coil signal (black hollow circle).

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/content/aip/journal/rsi/81/12/10.1063/1.3516043
2010-12-20
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hard x-ray correlation analysis as a diagnostic tool for the measurement of magnetic turbulence in tokamaks
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/12/10.1063/1.3516043
10.1063/1.3516043
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