Bremsstrahlung and KA Measurements of Laser to Hot Electron Coupling in Fast Ignition Conical Geometries*

The laser coupling efficiency into forward going relativistic electrons was studied on the Titan laser (1054 nm, 150 J, 0.7 p.s., 10$^{20}$ W/cm$^2$) at LLNL in a conical geometry using two separate techniques: an array of absolutely calibrated Bremsstrahlung spectrometers (differential sensitivity up to 700 keV) measuring emission from an Al cone-multilayer foil target, and a spherical Bragg crystal imager to image the Cu KA emission from the 1-D electron transport along an Al cone-Cu wire target. The electron transport and x-ray emission is modeled with the hybrid-PIC code LSP.