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Evidence cross-validation and Bayesian inference of MAST plasma equilibria
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10.1063/1.3677362
/content/aip/journal/pop/19/1/10.1063/1.3677362
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/1/10.1063/1.3677362
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Plasma beam cross-sections fill out a large region inside the limiter that encompasses the plasma volume for MAST discharges.

Image of FIG. 2.
FIG. 2.

(Color online) Evidence values for diagnostics removed via the ECV procedure. (a) Corresponds to shot #22254 at 350 ms, with m; and (b) corresponds to shot #24600 at 330 ms, with m.

Image of FIG. 3.
FIG. 3.

(Color online) Calculated evidence for scanned values of . (a) Corresponds to shot #22254 at 350 ms with nine magnetic diagnostics removed via ECV and (b) to shot #24600 at 330 ms with 10 magnetic diagnostics removed.

Image of FIG. 4.
FIG. 4.

(Color online) Current profile data inferred for MAST shot #22254 at 350 ms using pickup coils, flux loops, and MSE. The inferred LCFS is drawn in black on (a), (c), and (d); the EFIT++ LCFS is under-layered on all figures in white/thin solid lines for comparison only. Flux loop locations are indicated by stars outside the plasma region; position and orientation of pickup coils are indicated via heavy bars on the out-board edge of the first wall and as a vertically oriented column line along the solenoid; and MSE observation positions are indicated by the stars across the mid-plane inside the plasma region. Non-black diagnostics are those which have been removed by the ECV procedure. (a) Poloidal flux-surfaces corresponding to the expectation configuration of plasma beams. (b) Line-density plot showing the uncertainties in the 0.25, 0.50, 0.75, and 0.99 normalised flux-surfaces as calculated from 200 posterior samples; the solid lines indicate the expectation of these surfaces. (c) Shows the expected plasma beam configuration, the color bar indicating individual beam currents in kA. (d) Indicates the standard deviation of plasma beam currents in kA.

Image of FIG. 5.
FIG. 5.

(Color online) Current profile data inferred for MAST shot #24600 at 330 ms using magnetic and MSE with LCFS curves and diagnostic markers depicted as they were in Figure 4. (a) Shows the expected plasma beam configuration, the color bar indicating individual beam currents in kA. (b) Indicates the standard deviation of plasma beam currents in kA. Poloidal flux statistics are difficult to distinguish from Figures 4(a) and 4(b) and thus have not been included.

Image of FIG. 6.
FIG. 6.

(Color online) Data inferred for MAST shot #22254 at 350 ms using pickup coils, flux loops, and MSE. In both plots, the heavy lines indicates the expected value, with thin lines indicate the first standard deviation away from the mean; and the gray shading shows the profile distribution, as calculated from 200 samples of the current beam posterior. (a) q-profile as a function of normalised flux. (b) Plasma current density across the mid-plane as a function of radial coordinate.

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/content/aip/journal/pop/19/1/10.1063/1.3677362
2012-01-23
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Evidence cross-validation and Bayesian inference of MAST plasma equilibria
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/1/10.1063/1.3677362
10.1063/1.3677362
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