Developments in Diagnostics for Large Tokamaks

Successful understanding of the plasma behavior in the large tokamaks now in design or under construction will require more complex diagnostics than and, for some parameters, different diagnostics from those presently in use. This paper describes the significantly new aspects of these tokamaks for the plasma diagnostic physicist. It then discusses in more detail specific diagnostic developments that are required drawing on current operational experience. The paper concentrates on diagnostic techniques which are clearly of interest at a conference on small accelerators either through accelerator requirements, relevance to their own measurement techniques or their capability for providing development or calibration services.