【摘要】 利用"神光Ⅱ"激光装置的两束激光烧蚀半圆柱壳层靶产生了高速等离子体喷流。喷流的参数由光学和X射线诊断测量。喷流是准直的,在真空中传播。一维流体力学模拟被用来间接地计算喷流的速度。喷流的准直可能来源于高Z等离子体的辐射冷却。由于和年轻恒星喷流具有某些几何相似性,实验室喷流对于在实验室中模拟年轻恒星喷流具有潜在应用。更多还原

【Abstract】 High speed plasma jets are generated by ablating half-cylinder-shell targets with two laser bunches on ShenguangⅡLaser Facility.Using optical and X-ray diagnostics,the parameters of the plasma jets have been measured.Propagating in vacuum,the jets are collimated.One-dimensional hydrodynamic simulation is used to indirectly calculate the jet velocity.The collimation of the jets may be attributed to the expansion cooling of plasma bubbles ablated by main laser pulses.Radiative cooling of the high-Zplasmas might collimate the plasma jets as well.Having some geometrical similarities with young stellar object(YSO)jets,the jets have potential application to simulating YSO jets in laboratories.更多还原