Design and Simulation for Pre-amplifier of ITER Radial X-ray Camera

The radial X-ray camera, which is used to measure magnetohydrodynamic phenomenon and monitor edge localised mode events, is a key diagnostic system for physics studies in the international thermonuclear experimental reactor (ITER) tokamak. Considering the special requirements of physics measurements and spatial resolution, 144 detector channels are required. The board card of the pre- amplifieris designed to improve the integration, on which 16 signal channels have been integrated. In order to suppress the noise and improve the stability of the pre- amplifier, the target impedance analysis method is applied in the design of the power supply, the trans-impedance amplifierand a two-stage active low pass filter are applied in the design. Simulation with CadenceOrCAD and ANSYS SIwave has been adopted to optimize the characteristics of the pre- amplifier. A test of the pre- amplifiershows its good performance for ITER application. After optimization of the pre- amplifier, the band width is 270 kHz, the amplification is 107 V/A, and the noise attenuation is − 30 dB, the noise of the pre- amplifieris reduced to 10 mV (noise of the power supply is included).