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Multipulse Nd:YAG Laser Thomson Scattering Diagnostics on HT-7 Tokamak
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作者 臧庆 赵君煜 +2 位作者 运高谦 史录卫 许雅劼 《Plasma Science and Technology》 SCIE EI CAS CSCD 2008年第1期13-17,共5页
A multipulse Nd:YAG (Neodym-yttrium aluminium garnet) laser Thomson scattering diagnostic system developed was recently applied on HT-7 tokamak to obtain more accurate electron temperatures. A CAMAC-based real-time... A multipulse Nd:YAG (Neodym-yttrium aluminium garnet) laser Thomson scattering diagnostic system developed was recently applied on HT-7 tokamak to obtain more accurate electron temperatures. A CAMAC-based real-time computer system for laser control, data acquisition, analysis and calibration was investigated in detail. Furthermore, the reliability and accuracy of this diagnostic system were demonstrated by comparing the results with those of a soft-X ray diagnostic system. 展开更多
关键词 multipulse Nd:YAG laser thomson scattering ht-7 tokamak electron temperature
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Design of Amplifier Circuit for the HT-7 Tokamak Thomson Scattering System
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作者 史灵卫 凌必利 +4 位作者 赵君煜 杨利 臧庆 胡庆生 贾燕庆 《Plasma Science and Technology》 SCIE EI CAS CSCD 2008年第6期775-778,共4页
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 sensi... 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. 展开更多
关键词 ht-7 tokamak thomson scattering preamplifier
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HT-7 Multipoint Nd Laser Thomson Scattering Apparatus 被引量:2
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作者 毛剑珊 赵君煜 +2 位作者 李亚东 谢爱根 方自深 《Plasma Science and Technology》 SCIE EI CAS CSCD 2001年第2期691-702,共12页
A compact, low cost, multipoint Thomson scattering diagnostic system for HT-7 superconducting tokamak has been in operation since 1999. Its capability of measuring electron temperatures is in the range of 200 eV to 2 ... A compact, low cost, multipoint Thomson scattering diagnostic system for HT-7 superconducting tokamak has been in operation since 1999. Its capability of measuring electron temperatures is in the range of 200 eV to 2 keV at a density of a few times IO12 cm-3, with a spatial resolution of 2.4 cm for 5 spatial points and a temporal resolution of 1 ms-1 s for 8 time points. The main components of the diagnostic system include a 20-25 J Nd: glass laser with 35 ns pulse width (8 pulses per burst), a KDP frequency-doubling unit, spherical mirrors of multipass input optical system, a wide-angle collection objective, a bandpass glass filter for reducing the stray light to zero a f/2.5 polychromator, a fiberglass collimator, a photomultiplier's box with electronic preamplifier, high gain and high signal/noise ratio, CAMAC data acquisition and so on. The multipass optical system has been successful at increasing the quantity of scattered photons by passing the probing laser beam 10 times through the plasma under investigation. The HT7 Thomson scattering diagnostic has provided successfully the information on two-dimensional electron temperature in the plasma of HT-7 tokamak with LHCD and IBW. 展开更多
关键词 ht-7 Multipoint Nd Laser thomson scattering Apparatus
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HT-7 Nd:YAG激光汤姆逊散射光学系统分析 被引量:1
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作者 运高谦 赵君煜 《强激光与粒子束》 EI CAS CSCD 北大核心 2006年第6期944-948,共5页
光学透过性能对信号微弱的激光汤姆逊散射测量系统极为重要。主要讨论了HT-7 Nd:YAG激光汤姆逊散射系统光学设计中消除杂散光和提高散射信号传输效率的方法,并对系统的光学性能进行了模拟计算。模拟结果显示,干涉滤光片分光谱仪的光... 光学透过性能对信号微弱的激光汤姆逊散射测量系统极为重要。主要讨论了HT-7 Nd:YAG激光汤姆逊散射系统光学设计中消除杂散光和提高散射信号传输效率的方法,并对系统的光学性能进行了模拟计算。模拟结果显示,干涉滤光片分光谱仪的光学透过性能随电子温度的升高而增强,等离子体电子温度为1keV时其透过率可达到10%;汤姆逊散射信号非常微弱,等离子体电子密度为1×10^19/m^3时每道信号仅有几百到上千个光子;等离子体电子温度在0.3~5.0keV范围内时,光子量子统计涨落引起的电子温度测量误差在3%以下。 展开更多
关键词 汤姆逊散射 光学系统 光学透过性 电子温度 ht-7托卡马克装置
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HT-7激光汤姆逊散射信号处理电路设计
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作者 史灵卫 臧庆 +3 位作者 许雅劼 胡庆生 凌必利 赵君煜 《核聚变与等离子体物理》 EI CAS CSCD 北大核心 2007年第3期231-236,共6页
为了检测到散射信号且有较高的信噪比,使用硅雪崩二极管(APD)探测器探测汤姆逊散射光,采用电荷敏感运算放大器减小电子噪声。同时,设计了放大电路,并采取了一些抗干扰措施。在实验中,此激光汤姆逊散射系统成功地测量出HT-7等离子体的电... 为了检测到散射信号且有较高的信噪比,使用硅雪崩二极管(APD)探测器探测汤姆逊散射光,采用电荷敏感运算放大器减小电子噪声。同时,设计了放大电路,并采取了一些抗干扰措施。在实验中,此激光汤姆逊散射系统成功地测量出HT-7等离子体的电子温度。 展开更多
关键词 ht-7托卡马克 汤姆逊散射 电路噪声
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