無碰撞激震波在宇宙中扮演著重要的角色。在雷射電漿中無碰撞激震波已被觀 察。為了觀察激震波馬赫數，我們需要知道激震波速度與上游電漿聲速。藉由 高強度雷射照射固態靶，我們產生了在雷射電漿中的環境電漿。我們觀察時間 與空間的電漿演化藉由全域的圖像；而局域電漿溫度、密度與速度由集體的湯 木森散射系統所量測。從局域電漿溫度與密度，我們可以知道上游電漿聲速及 計算激震波馬赫數。;One of the fundamental factors in the universe is collisionless shocks. Collisionless shocks have been observed in laser-produced plasma. To obtain the shock Mach number, we need to know the shock velocity and upstream sound velocity. By irradiating a solid target with the high-power laser pulse, we produced laser-produced plasma in a presence of an ambient plasma. We observed temporal and spatial plasma Evolution with global images. The local temperature, density, and velocity of electrons and ions are obtained by collective Thomson scattering(CTS) system. From local temperature and density, we can understand the upstream sound velocity and obtain the shock Mach number.
