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通过数值求解等离子体流体力学方程组，研究了短脉冲激光打靶结束后形成的短密度梯度尺度等离子体的冷却降温过程，讨论了热传导、膨胀作功、辐射损失三种冷却机制对降温过程的贡献，并用解流体力学方程组得到的等离子参数计算了ＭｇＸＩ等离子体中波长小于２０ｎｍ的所有可能跃迁的自发辐射放大增益系数，分析了它们与环境条件的关系，指出了在ＭｇＸＩ等离子体中获取水窗附近乃至水窗波段软Ｘ射线激光的可能性。
By numerical solution of the plasma hydrodynamics equations, the cooling and cooling process of short density gradient-scale plasma formed after the short-pulse laser is finished is studied. The contribution of the three cooling mechanisms of heat conduction, expansion work and radiation loss to the cooling process is discussed The gain coefficients of spontaneous emission for all possible transitions with wavelength less than 20 nm in MgXI plasma were calculated by using the plasma parameters obtained from the equations of fluid mechanics. The relationship between them and the environmental conditions was analyzed. Near and even window soft X-ray laser possibilities.