Diagnostics for Heavy Ion Beam Driven Warm Dense Matter Experiments

A set of diagnostic has been developed for the WDM experiments at the NDCX linear accelerator which is used as a driver for heating metallic targets. The diagnostics are aimed at the in-situ measurement of temperature, expansion velocity and pressure of a WDM sample. A specially developed three-channel pyrometer probes color temperatures at 750 nm,1000 nm and 1500 nm, with 75 ps temporal resolution. The system has a broad dynamic range (black body), with a lower limit $\sim $2000 K and upper limit $\sim $100000 K. Continuous target emission from 450 nm to 850 nm is recorder by a custom spectrometer, consisting of a high dynamic range Hamamatsu streak camera and a holographic grating. The system is calibrated absolutely with a tungsten ribbon lamp (NIST traceable). Hydrodynamic expansion velocity of a target's free surface is measured by a commercially available all- fiber Doppler shift laser interferometer (VISAR).