冲击压缩产生的氩等离子体辐射不透明度研究

STUDIES ON OPACITY OF SHOCK-GENERATED ARGON PLASMAS

采用平面冲击压缩方法产生密度和温度都均匀的氩等离子体 ,根据光谱辐射强度随时间的变化测量了氩等离子体在可见光区几个波长通道的辐射不透明度 ,等离子体温度在 1 4— 2 2eV范围 ,密度在 0 0 0 83— 0 0 15g cm3之间 .测量值和理论计算结果符合较好 ,说明平均原子模型可以较好地描述该热力学条件下氩等离子体的光子输运行为 .基板表面的光反射率在确定辐射不透明度时是一个重要参数 .采用简化的自洽方法求解基板表面的光反射率 .结果表明 ,基板 氩气界面的光反射率R在 0 4附近 。

Dense plasmas with uniform and constant density and temperature are generated by passage of a planar shock wave through argon gas. Our experiments in argon have produced plasmas with a temperature of 14—22eV and a density of 00083—0015g/cm3. The opacity of the plasma is measured versus wavelength by recording the rise time of emitted light. Measurements in visible light are compared with the calculations using the average atom model, and the agreement is well. In data treatments, the opacity and the reflectance \%R(λ)\% at the baseplate /argon interface are simultaneously worked out. The resultant \%R(λ)\% in this work are all around 0\^4, which is in agreement with that given by Erskine.