Preliminary results of the Pt foil resistive bolometer on EAST

Introduction The EAST (Experimental Advanced Superconducting Tokamak) device is a full superconducting tokamak with the aim at long pulse operations and high performance plasma Presently, some diagnostics have been installed to provide the elementary plasma parameters including electron density, electron temperature, ion temperature, radiation power and so on The total radiated power as well as the radiation profile are measured by bolometer diagnostic. Two types of bolometer detectors known as metal foil resistive bolometer'31 and absolute extreme ultravioletC AXUV) photodiodes[4] are utilized in plasma radiation diagnostic on EAST. Two AXUV photodiode arrays installed in horizontal C port, each with 16 channels covering half poloidal cross-section, have worked normally because of its simple operation and low price. The resistive bolometer was installed in EAST for the first time in 2010. The metal foil resistive bolometer are selected as the main bolometer detector due to the advantage of long-term stable and high absorption coefficients in wide spectrum (>90% above 30eV). In this article, the resistive bolometer system on EAST is described in section II and preliminary results are reported in section III. Finally, a brief summary is given.