Collection Of theses on high power laser and plasma physics, 2014, 12 (1): 1737, Published Online: May. 27, 2017
X-ray line profile measurements in laser produced plasma
X射线能谱 谱线轮廓 激光等离子体诊断 电子密度 X射线谱仪 X-ray spectra spectral line shape laser plasma diagnostics electron density X-ray spectrometer
Abstract
This paper explores the parameter measurement in laser produced plasma by X-ray line profile spectrscopy. The experiment was conducted on the SG-II laser facility. A 0.35 μm laser beam was focused on a solid chlorine (Cl) target in a vacuum chamber to produce a laser chlorine plasma and the high resolution X-ray elliptical bent crystal spectrograph was used to obtain the X-ray fine structure energy spectrum of the chlorine plasma radiation. The line integrated intensity ratio between H-like Cl (1s-3p) (Lyman-) and He-like Cl (1s2-1s3p) (He-) transitions was used for calculation of the electron temperature. By assuming optically thin, the Lyman-stark broadened profile was utilized to measure the electron density. Obtained experimental results show that the volume averaged electron temperature of Te is about 450 eV and the electron density of Ne is approximately 7.5×1022 cm-3. In addition, the line Full Width at Half Maximum (FWHM) was analyzed. The uncertainty in Ne due to uncertainties in the temperature and the assumed background level was also simply discussed and it is estimated to be within 25%. As a result, the experimental spectroscopic method may become a reference for diagnosing future higher-compression implosions.
WANG Rui-rong, WANG Wei. X-ray line profile measurements in laser produced plasma[J]. Collection Of theses on high power laser and plasma physics, 2014, 12(1): 1737.