Plasma Spectroscopy on Hydrogen-Carbon-Oxygen Foam Targets Driven by Laser-Generated Hohlraum Radiation

Figure 1

Geometry of the setup. The target consists of TCA foam attached to the lower side of the cylindrical Au-hohlraum. The foam and the hohlraum were supported by a stainless-steel holder. There are two free surfaces perpendicular to the blue-dashed arrow for diagnostics. The flat-field grating spectrometer (FGS) was obliquely positioned toward the backside of the foam target to measure the plasma radiation. Thus, the hohlraum radiation was effectively shielded. The X-ray diode (XRD), as well as the transmission grating spectrometer (TGS), with a single-order diffraction grating was directed toward the laser entrance hole to measure the hohlraum radiation. The pinhole (PH) camera was aimed at about 50° relative to the X-axis to image the expansion of hohlraum and foam plasma emitted from the laser entrance hole and the free surface of the foam target in the direction of X axis, respectively.