- Conference date: 19-22 April 2004
- Location: Santa Fe, New Mexico (USA)
We have measured the production of hv ≈ 4.7 keV x‐rays from low‐density Ti‐doped aerogel (ρ ≈ 3 mg/cc) targets at the OMEGA laser facility (University of Rochester), with the goal of maximizing x‐ray output. Forty OMEGA beams (λL = 0.351 μm) illuminated the two cylindrical faces of the target with a total power that ranged from 7 to 14 TW. The laser fully ionizes the target (ne/n crit ⩽ 0.1), and a laser‐bleaching wave excites, supersonically, the high‐Z emitter ions in the sample. Heating in the target was imaged with gated x‐ray framing cameras and an x‐ray streak camera. Ti K‐shell x‐ray emission was spectrally resolved with a two‐channel crystal spectrometer and also with a set of filtered aluminum x‐ray diodes, both instruments provide absolute measurement of the multi‐keV x‐ray emission. We find between 40 – 260 J of output with 4.67 ⩽ hv ⩽ 5.0 keV. Radiation‐hydrodynamic calculations predict late time enhancement of the x‐ray power due first to axial stagnation of the heating waves, then, ablatively‐driven radial compression from the target walls.
MOST READ THIS MONTH
MOST CITED THIS MONTH
Article metrics loading...