Matter and Radiation at Extremes, Volume. 6, Issue 5, 054403(2021)
In situ observation of the Rayleigh–Taylor instability of liquid Fe and Fe–Si alloys under extreme conditions: Implications for planetary core formation
Fig. 1. Initial perturbation on the Fe–10 wt. % Si (No. 39 836) sample. (a) Laser scanning microscope images of initial perturbation on the sample surface. (b) Horizontal line profiles of the surface perturbation at the vertical center of the sample. The initial wavelength and amplitude of the perturbation in the fundamental mode are 80 ± 0.7 and 2.3 ± 0.1
Fig. 2. Schematic of experimental setup for face-on radiography. The drive laser and x-rays for radiography measurements come from the same direction onto the sample. The characteristic lengths are as follows: the backlighter–sample distance is 3 mm, the sample–slit distance is 50 mm, and the slit–XSC distance is 1450 mm. The direction of effective gravity is shown by the black arrow. This direction and that of the perturbation interface are consistent with the setting of the core formation scenario (accumulated Fe alloy on the mantle).
Fig. 3. X-ray radiography images of (a) Fe (No. 38 472) and (b) Fe–10 wt. % Si (No. 39 836) from face-on radiography. The bright areas correspond to higher x-ray transmitted intensity, indicating thinner parts of the sample perturbation. (c) Spatial line-scan profiles of (a) at early time (
Fig. 4. Temporal variation of the growth factor
Fig. 5. Growth rate
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Hidenori Terasaki, Tatsuhiro Sakaiya, Keisuke Shigemori, Kosaku Akimoto, Hiroki Kato, Yoichiro Hironaka, Tadashi Kondo. In situ observation of the Rayleigh–Taylor instability of liquid Fe and Fe–Si alloys under extreme conditions: Implications for planetary core formation[J]. Matter and Radiation at Extremes, 2021, 6(5): 054403
Category: Fundamental Physics At Extreme Light
Received: Sep. 13, 2020
Accepted: Aug. 2, 2021
Published Online: Oct. 19, 2021
The Author Email: Terasaki Hidenori (tera@okayama-u.ac.jp)