A new electronic system prototype for bolometric diagnostic based on metal foils on FTU device

Measurements of total radiated power are very important in tokamak plasmas, especially in the divertor region where they are required for heat flux active control. Bolometric detectors based on metal foils are used as sensors. The signal readout is provided by an electronic system which drives processes and acquires the signals from the resistive bridge-based bolometer. A project for a new electronic system is being carried on at ENEA Frascati Laboratories, aimed to develop an architecture and a system sufficiently flexible in order to be applied to large fusion devices, such as DTT and ITER. The project, conceived for high reliability and lasting time levels, is based on FPGA boards and a completely digital lock-in. A prototype has been recently tested both in the laboratory and on FTU plasma. A key point of the project is the capability of on-line calibration. The paper describes the architecture of the project for the bolometric diagnostic and the analysis of the first results on FTU plasma.