Quantitative study of radiation temperature for gold hohlraum on SG-II laser facility

Hohlraum radiation temperature is an important parameter for inertial confinement fusion (ICF) research. Experimental measurements of radiation temperature by a streaked optical pyrometer and a soft X-ray spectrometer (SXS) with 14 absolutely calibrated channels are performed on SG-Ⅱ laser facility,which shows that the results of the two methods agrees with each other well. With 2.1kJ laser energy and 1ns pulse width, the hohlraum radiation temperatures for small hohlraum ( Φ 0.8 mm×1.7 mm, LEH Φ 0.38 mm) and large hohlraum ( Φ 1.0 mm×2.1 mm, LEH Φ 0.6 mm) are 180 eV and 150 eV, respectively. Using a sampling-based method (Monte Carlo), an uncertainty analysis program-package is set-up for SXS. After precise calibration and improvements for several components in SXS, the relative uncertainty of radiation temperature is significantly reduced from 8% to 3%.