Accurate mapping of vacuum magnetic flux surfaces & islands

Electron-beam wire-tomography in the H-1NF heliac enables high resolution mapping of vacuum flux surfaces with minimal disruption of the plasma operations schedule. In conjunction with an image warping technique, this technique enables systematic exploration of magnetic islands and flux surfaces of interest. A fast mapping technique has significantly reduced the mapping time and made this technique suitable for mapping at higher magnetic fields. Extreme accuracy of this technique has been exploited to understand the nature of error fields, by point-by-point matching with computer tracing results. This has helped in developing a best-fit computer model for H-1NF magnetic configurations, which can predict rotational transform correct to three decimal places.

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Blackwell, Boyd profile