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Chapter 8: The Diagnostic Systems in the FTU

O. Tudisco, G. M. Apruzzese, P. Buratti, L. Cantarini, A. Canton, L. Carraro, V. Cocilovo, R. de Angelis, M. de Benedetti, B. Esposito, L. Gabellieri, E. Giovannozzi, G. Granucci, L. A. Grosso, G. Grosso, P. Innocente, H. Kroegler, M. Leigheb, G. Monari, D. Pacella, L. Panaccione, V. Pericoli-Ridolfini, G. Pizzicaroli, S. Podda, M. E. Puiatti, G. Rocchi, A. Sibio, A. Simonetto, P. Smeulders, U. Tartari, N. Tartoni, B. Tilia, M. Valisa, V. Zanza, M. Zerbini

Fusion Science and Technology

Volume 45 / Number 3 / May 2004 / Pages 402-421


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The design of diagnostics for the Frascati Tokamak Upgrade (FTU) is challenging because of the compactness of the machine (8-cm-wide ports) and the low operating 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 electron temperature profiles measurements and electron tails monitoring, far-infrared and CO2 interferometry, X-ray (soft and hard) measurements, a multichord neutron diagnostics (with different type detectors), and a Thomson scattering system. Some diagnostics specific to the FTU physics program have been used such as microwave reflectometry for turbulence studies, edge-scanning Langmuir probes for radio-frequency coupling assessment, oblique ECE, and a fast electron bremsstrahlung (FEB) camera for lower hybrid current drive-induced fast electron tails.

These systems are briefly reviewed in this paper. Further developments including a scanning CO2 laser two-color interferometer, two FEB cameras for tomographic analysis, a motional Stark effect system, and a collective Thomson scattering system are also described.

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