Design of Amplifier Circuit for the HT-7 Tokamak Thomson Scattering System  

作　　者：史灵卫 凌必利 赵君煜 杨利 臧庆 胡庆生 贾燕庆 

机构地区：[1]Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China

出　　处：《Plasma Science and Technology》2008年第6期775-778,共4页等离子体科学和技术（英文版）

基　　金：National Natural Science Foundation of China(No.10375068)

摘　　要：Thomson scattering diagnostic is important for measuring electron temperature and density profiles. To improve the signal-to-noise ratio, a silicon avalanche photodiode （APD） with high quantum efficiency, high sensitivity, and high gain up to 100 was adopted to measure the Thomson scattering spectrum. A preamplifier, which has low noise, high bandwidth, and high sensitivity, was designed with suitable transimpedance. Using AD8367 as the post-amplifier, good performance of the APD readout electronics have been obtained. A discussion is presented on the performance of the amplifier using a laser diode to simulate the Thomson scattering light. The test results indicate that the designed circuit has a high amplifying factor and fast rising edge. So reduction of the integral gate of the CAMAC ADC converter can improve the signal-to-noise ratio.Thomson scattering diagnostic is important for measuring electron temperature and density profiles. To improve the signal-to-noise ratio, a silicon avalanche photodiode （APD） with high quantum efficiency, high sensitivity, and high gain up to 100 was adopted to measure the Thomson scattering spectrum. A preamplifier, which has low noise, high bandwidth, and high sensitivity, was designed with suitable transimpedance. Using AD8367 as the post-amplifier, good performance of the APD readout electronics have been obtained. A discussion is presented on the performance of the amplifier using a laser diode to simulate the Thomson scattering light. The test results indicate that the designed circuit has a high amplifying factor and fast rising edge. So reduction of the integral gate of the CAMAC ADC converter can improve the signal-to-noise ratio.

关 键 词：HT-7 tokamak Thomson scattering PREAMPLIFIER 

分 类 号：TL631.24[核科学技术—核技术及应用]