RFX diagnostics

In this paper the diagnostic systems implemented on the reversed field pinch (RFP) experiment RFX are presented.
The paper is mainly concerned 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
guideline adopted in the development of diagnostics was to use, whenever possible, proven methods, at least for the
systems dedicated to the measurement of the most significant parameters. Each section of the paper illustrates a
different system, in which the diagnostic constraints and the specific choices derived from the peculiarities of the RFP
configuration are discussed. Although the majority of the diagnostic instruments 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 construction.