Application of a two-dimensional position-sensitive photon detector to time- and space-resolved laser-induced-fluorescence technique

首先，利用对真空紫外线敏感的Csl光电阴极，研制了基于MBWC技术的二维位置敏感光子计数器，并对其性能进行了研究。获得的位置分辨率为-120μm (FWHM)，实际长波长限制为-250 nm。在直径为-14mm的有效区域内，除宽度为3mm的边缘区域外，没有观察到灵敏度-波长曲线的位置依赖性。其次，我们的目标是利用CsSb光电阴极开发另一种对可见光区光子敏感的计数器。不幸的是，我们的光电阴极的寿命不够长（约一个月），并且尚未达到研究作为光子计数器的整体性能的步骤。然而，考虑在探测器室中引入合适的“吸气器”来解决这一困难，并且沿着这条路线进行改进正在进行中。最后，完成了激光诱导荧光技术光源的制备。在改进了可见光子计数器的稳定性后，将光子源与探测器相结合，研究时间分辨二维LIF等新型LIF技术。

First we developed a two-dimensional position-sensitive photon counter based on MBWC technique using Csl photo-cathode, which is sensitive to vacuum ultraviolet rays, and studied its properties. Obtained position resolution is -120μm (FWHM) , and practical long wavelength limit is -250 nm. Position dependence of sensitivity-wavelength curve was not observed over the -14mm-diameter effective area excluding the fringe area of which width is 3mm. Second, we aimed at developing another counter using CsSb photo-cathode which is sensitive to photons of visible region. Unfortunately lifetime of our photo-cathode was not long enough, ( 〜a month) and the step of studying overall properties as a photon counter has not been reached. However, introduction of suitable "getter" into a detector chamber is considered to resolve this difficulty, and the improvement along this line is in progress. Finally, The preparation of light source for laser-induced-fluorescence technique has been completed. After improvement of the stability of the visible photon counter, combining the photon source and the detector, new LIF techniques, e.g. time-resolved two-dimensional LIF, will be studied.