The hohlraum radiation temperature and M-band fraction on the SGIII-prototype laser facility

The hohlraum radiation temperature and M-band fraction are determined by a shock-wave technique and measured by a broadband soft x-ray spectrometer. The peak radiation temperature T$_{\mathrm{R}}$ and M-band fraction f$_{\mathrm{m}}$ are simultaneously determined by using the observed shock velocities in Al and Ti. For the vacuum Au hohlraum used in the experiments, T$_{\mathrm{R}}$ is about 160 eV and f$_{\mathrm{m}}$ is between 4.3-6.3{\%} under 1ns laser pulse of 2 k. And T$_{\mathrm{R}}$ is about 202 eV and f$_{\mathrm{m}}$ is about 9{\%} with laser energy 6 kJ . The Continuous Phase Plate (CPP) for beam smoothing is applied in the experiment, which increases T$_{\mathrm{R}}$ to 207 eV while has almost no influence on f$_{\mathrm{m}}$. Comparisons between the results from the two kinds of technologies show that T$_{\mathrm{R}}$ from the shock wave technique is lower than that from SXS whether CPP is applied or not. However, f$_{\mathrm{m}}$ from the shock wave technique is consistent with that from SXS without CPP, but obviously lower than the SXS's result with CPP.