Development of Laser Diagnostic Techniques for Clarification of Particle Behavior in Divertor Region

偏滤器区域的宏观行为，如电离前沿的位置和辐射强度的分布，必须通过将这些与那里的等离子体参数，如电子温度和密度，原子氢密度和杂质密度相关联来理解。在本研究中，我们致力于发展一种能够充分利用激光辅助等离子体诊断的方法来测量等离子体参数。这些是汤姆逊散射、双光子激发的LIF（激光诱导荧光）、以及瑞利和拉曼散射。取得了以下结果。(1)汤姆逊散射我们考虑了偏滤器的LIDAR（光探测和测距）汤姆逊散射，并得出所需的激光，具有1 J的能量和100-300 ps的脉冲宽度，可以使用脉冲压缩技术来实现。此外，还与JET偏滤器激光雷达进行了合作，并获得了初步结果。此外，较低的检测 ...更多信息 利用现有的放电等离子体研究了汤姆逊散射的极限。结果，我们获得了1*10^m2的检测限<16><-3>。(2)双光子激发激光诱导荧光（LIF）对适用于偏滤器等离子体的双光子激发LIF技术进行了实验和理论研究。特别地，我们建立了从解卷积的多普勒谱线中计算氢原子温度的方法。(3)瑞利散射和拉曼散射我们首次证明了瑞利散射和拉曼散射可用于实际等离子体中原子和分子密度的测量。特别是前者已经在10 μ m ~ 2的密度下产生了信号<19>，<-3>而后者已经有了初步的结果并正在进行分析，我们相信这些成果对于理解偏滤器区的粒子行为以及将这些行为与偏滤器等离子体的宏观行为（如电离前沿和辐射强度分布）联系起来是有用的。少

Macroscopic behavior in divertor region, such as the position of the ionization front and the distribution of the radiation intensity has to be understood by correlating these with plasma parameters there, such as electron temperature and density, atomic hydrogen density, and impurity density. In this study, we have performed to develop methods to measure the plasma parameters by fully exploiting the potensial of the laser-aided plasma diagnostics. These are Thomson scattering, two photon excited LIF (laser induced fluorescence), and Rayleigh and Raman scattering. The following results have been obtained.(1) Thomson scatteringWe have considered about LIDAR (light detection and ranging) Thomson scattering for divertors, and obtained that the necessary laser, having energy of 1 J and pulse width of 100-300 ps, is realizable using pulse compression technique. Also, a collaboration has been performed with JET divertor LIDAR and a preliminary result was obtained. In addition, lower detectio … More n limit of Thomson scattering has been studies using existing discharge plasmas. As a result, we obtained the detection limit of 1*10^<16>m^<-3>.(2) Two-photo excited LIFThe technique of the two photon excited LIF,applicable for divertor plasmas, has been studied experimentally and theoretically. In particular, we have established the nethod of yielding atomic hydrogen temperature from the deconvolved Doppler spectral profiles.(3) Rayleigh and Raman scatteringWe have demonstrated, for the first time, that Rayleigh and Raman scattering is applicable to measurements of atomic and molecular densities in actual plasmas. In particular, the former has yielded signals from densities of 10^<19>m^<-3>, while the latter has yielded preliminary results and analyzes are underway.We believe these achievements are useful in understanding particle behavior in divertor region, and in correlating these with macroscopic behavior of divertor plasmas, such as ionization front and radiation intensity distributions. Less