铝丝阵Z箍缩电子温度径向轮廓研究

Electron Temperature Radial Profile Research of Aluminum Wire-Array Z-Pinch

利用均匀色散云母弯晶分析器,在"阳"加速器上测量了铝丝阵Z箍缩等离子体的时间积分X射线光谱。采用碰撞辐射模型,通过测量Al的Ly-α/He-α以及Ly-β/He-ε的强度比推断出平均电子温度,分别为512eV和489eV。针对记录的连续辐射,由连续谱斜率拟合得到了等离子体核心电子温度为1215eV。对圆柱箍缩温度径向轮廓的研究表明,此次聚爆实验的电子温度从箍缩轴心向外缘近似线性降低。谱线强度比法是诊断平均电子温度的有效手段,而连续谱拟合法为诊断铝丝阵箍缩核心区的等离子体电子温度提供了重要信息。

Time-integrated X-ray spectra produced by aluminum wire-array Z-pinch plasmas are measured with a novel mica uniform dispersion crystal spectrograph at Yang accelerator. By using the collisional-radiative equilibrium （CRE） model, the average electron temperature is estimated to be 500 eV from the intensity ratios of Ly-α/He-α line and Ly-β/He-β line. The plasma core electron temperature is around 1215 eV derived from the continuum slope with linear fitting. The experimental result demonstrates that the electron temperature shows a nearly linear decrease from the axis to the outer edge of the pinch in this implosion. It is shown that the intensity ratio is an efficient tool for inferring electron temperature and the continuum slope provides essential information of core electron temperature of aluminum wire-array implosion.