X-ray-imaging spectrometer (XRIS) for studies of residual kinetic energy and low-mode asymmetries in inertial confinement fusion implosions at OMEGA (invited)

A system of x-ray imaging spectrometers (XRIS) has been implemented on the OMEGA Laser Facility capable of spatially- and spectrally-resolving x-ray self-emission from 5-40 keV. The system consists of three independent imagers with nearly-orthogonal lines of sight for 3D reconstructions of the x-ray emission region. The distinct advantage of the XRIS system is its large dynamic range enabled by the use of tantalum apertures with radii ranging from 50 μm to 1 mm, magnifications of 4 to 35x, and image plates with any filtration level. In addition, XRIS is capable of recording 1-100’s of images along a single line of sight facilitating advanced statistical inference on the detailed structure of the x-ray emitting regions. Properties such as P0 and P2 of an implosion are measured to 1% and 10% precision respectively. Furthermore, the Te can be determined to 5% accuracy. Lastly, a spatial measurement of the x-ray emission from XRIS has been used simultaneously with temporally- resolved measurements form the Particle X-ray Temporal Diagnostic (PXTD) to reconstruct the dynamics of x-ray emission during an experiment.