458 / 2019-03-11 16:24:07

First exploration of radiation temperatures of the laser spot, re-emitting wall and entire hohlraum drive source

Inertial fusion; Distributions of the temperature fields; Influence

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This study explores the radiation field temperatures introduced by the laser spot, the reemitting wall in a hohlraum and the entire hohlraum drive source. This investigation,
which is the first of its kind, is based on the radiation fluxes from the laser spot and the
re-emitting wall, which have been accurately measured using time- and space-resolving
flux detectors, and additional flux data. The temperature difference between the laser spot
and the entire hohlraum drive source was 6.08–35.35% of the temperature of the latter
throughout the entire laser pulse, whilst that for the re-emitting wall was 3.90–12.81%.
The radiation temperature of the cooler re-emitting wall had more influence on the
temperature increase of the entire hohlraum drive source than the hot laser-spot
temperature, which has been quantitatively discussed. Experimentally, we established the
average distributions of the temperature fields of all the emitting sources, namely laser
spot and re-emitting wall, of the irradiating fluxes on the capsule region in the hohlraum
radiation field. This important progress in the exploration of radiation temperature
distributions within a hohlraum will provide a foundation for determination of the
irradiating radiation on the capsule and evaluation of capsule symmetry.