Macroscopic stability of high β MAST plasmas
- Chapman, I T
- Cooper, W.A.
- Graves, J.P.
- Gryaznevich, M P
- Hastie, R.J.
- Hender, T.C.
- Howell, D F
- Hua, M.-D.
- Huysmans, G.
- Keeling, D
- Liu, Y Q
- Meyer, H
- Michael, Clive
- Pinches, S D
- Saarelma, S.
- Sabbagh, S.A.
- MAST Team, The
DOIAbstract
The high-beta capability of the spherical tokamak, coupled with a suite of world-leading diagnostics on MAST, has facilitated significant improvements in the understanding of performance-limiting core instabilities in high performance plasmas. For instance, the newly installed motional Stark effect diagnostic, with radial resolution <25 mm, has enabled detailed study of saturated long-lived modes in hybrid scenarios. Similarly, the upgraded Thomson scattering system, with radial resolution <10 mm and the possibility of temporal resolution of 1 νs, has allowed detailed analysis of the density and temperature profiles during transient activity in the plasma, such as at a sawtooth crash. High resolution charge exchange recombination spectrosco...
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