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Experimental Evidence of Kinetic Effects in Indirect-Drive Inertial Confinement Fusion Hohlraums
Experimental Evidence of Kinetic Effects in Indirect-Drive Inertial Confinement Fusion Hohlraums
- Source :
- Physical review letters. 120(19)
- Publication Year :
- 2018
-
Abstract
- We present the first experimental evidence supported by simulations of kinetic effects launched in the interpenetration layer between the laser-driven hohlraum plasma bubbles and the corona plasma of the compressed pellet at the Shenguang-III prototype laser facility. Solid plastic capsules were coated with carbon-deuterium layers; as the implosion neutron yield is quenched, DD fusion yield from the corona plasma provides a direct measure of the kinetic effects inside the hohlraum. An anomalous large energy spread of the DD neutron signal (∼282 keV) and anomalous scaling of the neutron yield with the thickness of the carbon-deuterium layers cannot be explained by the hydrodynamic mechanisms. Instead, these results can be attributed to kinetic shocks that arise in the hohlraum-wall-ablator interpenetration region, which result in efficient acceleration of the deuterons (∼28.8 J, 0.45% of the total input laser energy). These studies provide novel insight into the interactions and dynamics of a vacuum hohlraum and near-vacuum hohlraum.
Details
- ISSN :
- 10797114
- Volume :
- 120
- Issue :
- 19
- Database :
- OpenAIRE
- Journal :
- Physical review letters
- Accession number :
- edsair.doi.dedup.....7574a5406fd7c0fe7f10e1148b8509c2