The 4th International Conference on Matter and Radiation at Extremes (ICMRE 2019)

409 / 2019-02-28 19:45:15

M-band flux asymmetry measurement in hohlraum based on fluorescence imaging

M-band, drive symmetry, fluorescence imaging

Plenary track > Laser and Particle Beam Fusion

M-band flux asymmetry (MFA) may be another critical factor which can lead to low-mode distortion of implosion. We describe an experimental technique employing the x-ray fluorescence signature of material to investigate the MFA onto the capsule. Si was chosen to be the tracer layer, since the inducing threshold for the K-shell fluorescence is much higher than soft x-ray but lower than M-band x-ray. M-band radiation from the corona of the laser-produced gold plasma, especially the laser spot regions in the cavity, was used to pump x-ray fluorescence of a thin layer of Si-tracer coated on a solid CH-ball. The fluorescence images were recorded by an x-ray framing camera (XFC) and thus the P2 MFA was deduced from the fluorescence images.