RFX DIAGNOSTICS

In this paper the diagnostic systems implemented on the reversed field pinch (RFP) experiment RFX are presented. The paper is mainly concern ed with the general engineering aspects and with the development work addressed to meet specific requirements such as immunity to electrical noise, ultrahigh vacuum compatibility, reliability. A general guideli ne adopted in the development of diagnostics was to use, whenever poss ible, proven methods, at least for the systems dedicated to the measur ement of the most significant parameters. Each section of the paper il lustrates a different system, in which the diagnostic constraints and the specific choices derived from the peculiarities of the RFP configu ration are discussed. Although the majority of the diagnostic instrume nts are at present fully developed and operational, some of them, i.e. far-IR polarimeter, microwave reflectometer, soft X-ray and bolometer tomographic system are either under prototype testing or under constr uction.