Properties of well isolated warm dense matter produced by collision of high-speed plasma jets

The properties of warm dense matter are crucial for understanding the physics underlying star formation, stellar evolution, and inertial confinement fusion (ICF). We present soft X-ray measurements of a well-isolated warm dense plasma system produced by collision of high-speed plasma jets in ICF-related experiments with double-cone targets. The colliding plasma was found to exhibit a structure consisting of hotter inner core and colder outer shell. The core region emits continuum Planckian radiation with an effective temperature of 45 53 0 44 eV . The outer shell, which has electron density around 23 -3 10 cm and temperature of 34 26 2 12 eV , introduces absorption lines of carbon ions superposed on the continuum spectra. Two-dimensional radiation hydrodynamic simulations and synthetic X-ray spectral image reveal the detailed physical processes diagnosed with the experimental measurements.