Diagnostics for Experimental Thermonuclear Fusion Reactors 2 James J International Critical Tables O.P International Critical Tables the Community Bureau of Reference and expert laboratories in the member states This workshop was the seventh organized by the International School of Plasma Physics "Piero Caldirola" on the topic of plasma diagnostics and the second devoted to the diagnostic studies for the International Thermonuclear Experimental Reactor (ITER) It is also anticipated that diagnostics will be used much more extensively as input to control systems on ITER than on present fusion devices and this will require increased relia bility and long term stability