Spatially-resolved spectroscopic diagnosing of aluminum wire array Z-pinch plasmas on QiangGuang-I facility

• Published in: Chinese physics B 2010-07, Vol.19 (7), p.377-381
• Main Author: 叶凡 李正宏 秦义 蒋树庆 薛飞彪 杨建伦 徐荣昆 金永杰
• Format: Article
• Language: English
• Subjects: Aluminum; Arrays; Density; Electron temperature; Plasmas; Spectrometers; Wire; X-rays; Z箍缩等离子体; 电子温度; 空间分辨光谱; 等离子体辐射; 诊断设备
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/19/7/075204

Spatially-resolved crystal spectrometers with a high spectral resolution are developed to diagnose K-shell x-ray radiation from Z-pinch plasmas. These diagnostic apparatuses are successfully applied to aluminum wire array Z-pinch experiments on QiangGuang-I facility, a driver with a pulsed current up to about 1.5 MA in 80 ns. Time-integrated experimental results show that the K-shell x-ray emission lines of aluminum Z-pinch plasmas are dominated by line emissions from helium-like ionisation state. Bright spots that might have higher electron temperature or density are produced randomly in location and size along the z-axis during implosions. According to the experimental data, the electron temperature and the ion density are estimated to be between 250 eV and 310 eV, and between 7.0× 10^19 cm-3 and 4.0 ×10^19 cm-3 respectively, while the ion temperature is inferred to be about 10.2 keV, which is much higher than the electron temperature.