High resolution diagnostics on COMPASS-D and START

In this paper we describe three novel high resolution diagnostic systems on the Culham tokamaks. The first is a pair of high dispersion, short sampling time visible light spectrometers, employing a fast charge-coupled device (CCD) and a multianode photomultiplier as detectors, allowing unusually high bandwidth ion drift velocity measurements. Secondly, the application of an X-ray CCD to a Johann spectrometer for ion and electron core parameter characterisation is outlined. Lastly, a very high throughput, 30-channel Thomson scattering spectrometer system is described, which exploits the low f number lens design techniques, coated fibres and third-generation image intensifiers now available.