Abstract
The START experiment has exhibited both peaked and flat density profiles, with steep gradients either internally or at the edge. Time resolved profile information is therefore important to explore profile changes. Any diagnostics should be resilient to the transient MHD instabilities including edge fluctuations. The START tokamak has been in operation since 1991 and is the first spherical tokamak to have produced high temperature plasmas1. The diagnostics set on START includes multipoint Thomson scattering (TS), a neutral particle analyser, fast CCD video camera, multichord SXR camera, HCN interferometer, magnetic pick-up coils, flux loops and spectroscopy.
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