J-TEXT托卡马克上的7通道FIR HCN干涉仪
The 7-channel FIR HCN Interferometer on J-TEXT Tokamak
摘要：
建立了一台七通道远红外氰化氢（HCN）激光干涉仪，为J-TEXT实验提供线积分等离子体密度。采用腔长为3.4 m的连续波辉光放电HCN激光器作为光源，波长为337 μm，输出功率达100 mW。该系统被配置为Mach-Zehnder型干涉仪。相位调制是通过一个旋转的光栅，与10 kHz的调制频率对应的时间分辨率为0.1毫秒。拍频信号由TGS检测器检测。用相位灵敏度为0.06条纹的比较器测量了等离子体引起的相移。详细介绍了J-TEXT干涉仪测量的实验结果。此外，还给出了用常规方法反演的电子密度分布。二甲基硅油的运动粘度和振动控制是影响系统性能的关键因素。研究了不同运动粘度硅油对激光功率稳定性的影响。试验结果表明，减振效果有明显改善。
英文摘要：
A seven-channel far-infrared hydrogen cyanide (HCN) laser interferometer has been established aiming to provide the line integrated plasma density for the J-TEXT experimental scenarios. A continuous wave glow discharge HCN laser designed with a cavity length 3.4 m is used as the laser source with a wavelength of 337 μm and an output power up to 100 mW. The system is configured as a Mach-Zehnder type interferometer. Phase modulation is achieved by a rotating grating, with a modulation frequency of 10 kHz which corresponds to the temporal resolution of 0.1 ms. The beat signal is detected by TGS detector. The phase shift induced by the plasma is derived by the comparator with a phase sensitivity of 0.06 fringe. The experimental results measured by the J-TEXT interferometer are presented in details. In addition, the inversed electron density profile done by a conventional approach is also given. The kinematic viscosity of dimethyl silicone and vibration control is key issues for the system performance. The laser power stability under different kinematic viscosity of silicone oil is presented. A visible improvement of measured result on vibration reduction is shown in the paper.
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