A magnetic diagnostic on Tore Supra

A magnetic diagnostic has been installed in Tore Supra during the year 2000. It has been designed to be compatible with the configuration Composants Internes Et Limiteur (CIEL) requirements. It consists of a set of 424 dedicated magnetic sensors, pickup coils, and flux loops. The entire system is placed in the tokamak vacuum vessel at low pressure, high temperature, and is exposed to plasma radiation. The magnetic field is determined by attaching an analog integrator to each sensor. These electronic cards were developed for long pulse operation up to 1000 s. Finally the data are acquired by a system using the VME standard. The diagnostic has been successfully operated since the restart of Tore Supra with the CIEL configuration in September 2001. It has demonstrated the capability to control the plasma during discharges of several hundreds seconds and it participates to the physics program of the CIEL Project. The technology employed for the diagnostic achievement is robust, safe, and it can be extrapolated to other tokamaks.