Determining the hohlraum radiation temperature and M-band fraction by a shock wave technique

Experiments have been conducted with two materials Al and Ti as shock wave witness plates to demonstrate the proposal of determining the hohlraum peak temperature and M-band fraction. 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. This is the first experimental determination of T$_{\mathrm{R}}$ and f$_{\mathrm{m}}$ by using the shock wave technique. For the 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{\%} under 1ns laser pulse of 6 kJ. The results from this technique are complementary to those of the broadband soft x-ray spectrometer.