The LIDAR Thomson scattering diagnostic on JET (invited)
The LIDAR Thomson scattering diagnostic on JET (invited)
复制标题
JET 上的 LIDAR Thomson 散射诊断（受邀）
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
K. Weisberg
中科院分区：
文献类型：
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作者：
H. Salzmann;J. Bundgaard;A. Gadd;C. Gowers;K. Hansen;K. Hirsch;P. Nielsen;K. Reed;C. Schrödter;K. Weisberg
通过将飞行时间或激光雷达原理与汤姆森背向散射诊断相结合，测量了磁约束聚变等离子体中电子温度和密度的空间分布。这项技术首次在喷气托卡马克上实现。红宝石激光(3J脉冲能量，300ps脉冲宽度，0.5赫兹重复频率)与700 MHz带宽检测和配准系统相结合，产生约12厘米的空间分辨率。一台在400-800 nm波长范围内有6个通道的光谱仪，其温度测量的动态范围为0.3-20keV。后向散射几何中的杂散光问题通过光电倍增管的光谱辨别和选通来克服。包含激光波长的光谱通道中的红宝石滤光片可以通过拉曼散射来校准视线上的晕晕，从而能够测量密度分布。由于单个空间的积分时间较短，背景信号的电平较低。
By combining the time‐of‐flight or LIDAR principle with a Thomson backscatter diagnostic, spatial profiles of the electron temperature and density are measured in a magnetically confined fusion plasma. This technique was realized for the first time on the JET tokamak. A ruby laser (3‐J pulse energy, 300‐ps pulse duration, 0.5‐Hz repetition rate) together with a 700‐MHz bandwidth detection and registration system yields a spatial resolution of about 12 cm. A spectrometer with six channels in the wavelength range 400–800 nm gives a dynamic range of the temperature measurements of 0.3–20 keV. The stray light problem in the backscatter geometry is overcome by spectral discrimination and gating of the photomultipliers. A ruby filter in the spectral channel containing the laser wavelength allows calibration of the vignetting along the line of sight by means of Raman scattering, enabling the measurement of density profiles. The low level of background signal due to the short integration time for a single spatial...