The diagnostic systems in the FTU

The design of diagnostics for the Frascati Tokamak Upgrade (FTU) is challenging because of the compact-ness of the machine (8-cm-wide ports) and the low op-erating temperatures requiring the presence of a cryostat. Nevertheless, a rather complete diagnostic system has been progressively installed. The basic systems include a set of magnetic probes, various visible and ultraviolet spectrometers, electron cyclotron emission (ECE) for elec-tron temperature profiles measurements and electron tails monitoring, far-infrared and CO2interferometry, X-ray (soft and hard) measurements, a multichord neutron di-agnostics (with different type detectors), and a Thomson scattering system. Some diagnostics specific to the FTU physics program have been used such as microwave re-flectometry for turbulence studies, edge-scanning Lang-muir probes for radio-frequency coupling assessment, oblique ECE, and a fast electron bremsstrahlung (FEB) camera for lower hybrid current drive-induced fast elec-tron tails. These systems are briefly reviewed in this paper. Further developments including a scanning CO2 laser two-color interferometer, two FEB cameras for tomo-graphic analysis, a motional Stark effect system, and a collective Thomson scattering system are also described.