Several-nanometer growth in initial plasma linked to laser absorption falling to about one quarter
PhysicsUnverifiedUpdated:
A research group reports that a single-camera X-ray diffraction method tracked plasma expansion from nanoscale to submicrometer scales and linked tiny initial-plasma differences to a large change in laser absorption.
Simultaneous diffraction measurements from one X-ray pulse
An international research group developed a method to record ultra-small-angle through wide-angle diffraction signals produced by a single X-ray pulse with one camera.
Combined with an X-ray free-electron laser, the method was used to derive the expansion speed of high-energy-density plasma evolving on picosecond timescales. The group reports that experiment–simulation comparisons identified a strong dependence of laser absorption on the initial surface-plasma size.
The report does not provide a broader before-to-after baseline outside its stated experimental and numerical-simulation comparison.
In the reported experiment and simulations, increasing the initial surface-plasma size by only several nanometers was associated with laser absorption in a microstructured solid falling to about one quarter.
Small initial-structure differences affect absorption
The reported result connects structures separated by scales from nanometers to submicrometers with a major shift in laser–solid interaction within the reported setup. It does not establish a practical application or benefit.
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- 京都大学 研究成果世界初、単発X線パルスでナノ〜サブマイクロメートル構造をカメラ一台で同時計測―微細な初期プラズマ構造がレーザー固体相互作用を劇的に変化させる機構を解明―Read source →