低多义性误差的条纹反射技术系统结构研究

条纹反射技术中的多义性误差将直接影响测量结果的精度，现有的多义性误差消除方法会大大增加系统复杂程度，且只能补偿部分的误差。推导了条纹反射系统不含多义性误差的准确相位-梯度解析模型，对该模型仿真分析得出:当系统设置满足进入相机的光线与参考平面和显示屏都成90°夹角条件时，系统多义性误差近乎为0的结论，基于此，提出一种基于同轴光路系统结构，实验证明了所提出的同轴光路系统结构在物体表面高度从0增加至3 mm时多义性误差始终近乎为0，普通系统结构的多义性误差随着物体表面高度从0增加到3 mm时，多义性相位误差从0增加至1.5 rad，实验证明使用提出的同轴系统可以大大抑制条纹反射技术中的多义性误差。     

涡旋光束在不同盐度的水下湍流中的传输特性的实验研究

研究光束在海洋湍流中的传输特性尤为重要.为了更贴近实际情况,人工搭建了能控制水下湍流强度和盐度的装置来研究涡旋光束和高斯光束在水下湍流中的传输特性.结果表明:相比于未添加海盐的水下湍流,光束在增添海盐的水下湍流中传输光斑会更加弥散,光强会更弱.无论是强湍流还是弱湍流,m=2的涡旋光束在盐度为4.35‰的水下湍流中的闪烁...     

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为了提高HT-7装置上等离子体电子回旋辐射(ECE)超外差诊断系统的极向分辨率,根据高斯光学原理,分析了诊断系统天线的改进方案。优化了天线的圆形角锥喇叭尺寸和凸透镜参数以及在装置上的相对位置,使天线接收到的等离子体ECE异常模二次谐波辐射的高斯光束束半径只有30mm左右,能量的高斯光学性质损失不大于13%。     

First Charge Exchange Recombination Spectroscopy Diagnostic in HL-2A Tokamak

Spatially resolved measurements of ion temperature are crucial for understanding plasma dynamics. A charge exchange recombination spectroscopy diagnostic system based on a heating neutral beam is installed on the HL- 2A tokamak. An optical collection system is designed in accordance with the actual geometry of HL-2A and the CVI 529.2nm （n = 8 → 7） charge-exchange recombination line. Preliminary measurements show that the CX signals have enough signal-to-noise ratio （SNR）. The ion temperature and its profiles are obtained through this svstem for the first time.     

Sawtooth-Stabilization and Snake-Excitation during LHCD on the HL-1M

Lower-hybrid current drive (LHCD) experiments were carried out in the HL-1M hydrogen plasmas.The suppression of sawtooth instabilities by LHCD has been observed in the sawtoothing discharges;an improvement in the global energy confinement time of up to 20％ is observed.There is an optimal rf-power range for the complete suppression of the central MHD instabilities.Possible mechanisms for the stabilization of the sawtooth instability are discussed from the measurement of internal inductance and current profile reconstruction using an equilibrium code.A large long-lived snake-like oscillation is newly observed at the end of the sawtooth-stabilization phase of the LHCD operation in the HL-1M tokamak.It is evident that such perturbation is due to a temperature depression caused by impurity accumulation during LHCD.     

HL-1M装置ECRH系统的研制与实验

在HL-1M装置上研制了一套75GHz、500kW／50ms的大型电子回旋共振加热系统，设计了准光学传输系统和顶部、水平两套天线，对系统进行了调试，获得了最佳的系统参数和运行条件，并开展了各种O模和X模实验。在单管250kW的基波0模的实验中，获得电子温度提高40％，电流位形负剪切分布以及鱼骨模不稳定性研究等重要的物理实验结果。