Xe介质极紫外光源时间特性及最佳条件研究

Time behavior and optimum conditions for the Xe gas extreme ultraviolet source

理论和实验上研究了Xe介质毛细管放电极紫外光源等离子体时间特性和最佳条件.从理论上建立了Xe介质一维辐射磁流体力学模型,模拟了不同气压和电流条件下等离子体压缩和辐射特性;实验上测量了放电电流30 kA时不同气压条件下13.5 nm(2%带宽)动态特性.理论和实验结果表明:不同放电电流条件下,存在最佳气压值,最佳气压随着电流的增加而增加;同时,电流增加时,13.5 nm(2%带宽)辐射光强峰值时刻减小.

The time behavior and the optimum conditions for the Xe gas capillary discharge extrem ultraviolet source are investigated theo- retically and experimentally. By setting up a one-dimensional magneto-fluid-mechanics model, the plasma compressing characteristics and the emission characteristics are simulated under different gas pressures and different discharge currents. The time characteristic and the intensity of the 13.5 nm（2% bandwidth） emission are measured experimentally. The theoretical and experimental results show that there are the optimum gas pressures for different discharge currents. Meanwhile, the optimum gas pressure increases with the discharge current increasing. Moreover, the time to generate the highest 13.5 nm（2% bandwidth） emission should decrease by the in- crease of the discharge current. All the results should be useful to better understand the plasma condition for the discharge experiments and the EUV source. And it can be used to increase the power of the extreme ultraviolet source as well.